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C++

C++

The C++ Programming Language, written by its architect, is the seminal book on the language.

Paradigm(s) Multi-paradigm:[1] procedural, functional, object-oriented, generic

Appeared in 1983

Designed by Bjarne Stroustrup

Developer •• Bjarne Stroustrup•• Bell Labs•• ISO/IEC JTC1/SC22/WG21

Stable release ISO/IEC 14882:2011 (2011)

Typing discipline Static, unsafe, nominative

Major implementations C++ Builder, clang, Comeau C/C++, GCC, Intel C++ Compiler, Microsoft Visual C++, Sun Studio

Dialects Embedded C++, Managed C++, C++/CLI, C++/CX

Influenced by C, Simula, Ada 83, ALGOL 68, CLU, ML[1]

Influenced Perl, LPC, Lua, Pike, Ada 95, Java, PHP, D, C99, C#,[2] Falcon, Seed7

OS Cross-platform (multi-platform)

Usual filename extensions .h .hh .hpp .hxx .h++ .cc .cpp .cxx .c++

Website News, status & discussion about Standard C++ [3]

C++ Programming at Wikibooks

C++ (pronounced "see plus plus") is a statically typed, free-form, multi-paradigm, compiled, general-purposeprogramming language. It is regarded as an intermediate-level language, as it comprises a combination of bothhigh-level and low-level language features.[4] Developed by Bjarne Stroustrup starting in 1979 at Bell Labs, it addsobject oriented features, such as classes, and other enhancements to the C programming language. Originally namedC with Classes, the language was renamed C++ in 1983,[5] as a pun involving the increment operator.C++ is one of the most popular programming languages[6][7] and is implemented on a wide variety of hardware andoperating system platforms. As an efficient compiler to native code, its application domains include systemssoftware, application software, device drivers, embedded software, high-performance server and client applications,and entertainment software such as video games.[8] Several groups provide both free and proprietary C++ compilersoftware, including the GNU Project, Microsoft, Intel and Embarcadero Technologies. C++ has greatly influencedmany other popular programming languages, most notably C#[2] and Java. Other successful languages such asObjective-C use a very different syntax and approach to adding classes to C.C++ is also used for hardware design, where the design is initially described in C++, then analyzed, architecturallyconstrained, and scheduled to create a register-transfer level hardware description language via high-levelsynthesis.[9]

The language began as enhancements to C, first adding classes, then virtual functions, operator overloading, multipleinheritance, templates and exception handling among other features. After years of development, the C++programming language standard was ratified in 1998 as ISO/IEC 14882:1998. The standard was amended by the2003 technical corrigendum, ISO/IEC 14882:2003. The current standard extending C++ with new features wasratified and published by ISO in September 2011 as ISO/IEC 14882:2011 (informally known as C++11).[10]

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History

Bjarne Stroustrup, creator of C++

Bjarne Stroustrup began his work on "C with Classes" in 1979.[5] Theidea of creating a new language originated from Stroustrup'sexperience in programming for his Ph.D. thesis. Stroustrup found thatSimula had features that were very helpful for large softwaredevelopment, but the language was too slow for practical use, whileBCPL was fast but too low-level to be suitable for large softwaredevelopment. When Stroustrup started working in AT&T Bell Labs, hehad the problem of analyzing the UNIX kernel with respect todistributed computing. Remembering his Ph.D. experience, Stroustrupset out to enhance the C language with Simula-like features. C waschosen because it was general-purpose, fast, portable and widely used.

Besides C and Simula, some other languages that inspired him were ALGOL 68, Ada, CLU and ML. At first, theclass, derived class, strong type checking, inlining, and default argument features were added to C via Stroustrup'sC++ to C compiler, Cfront. The first commercial implementation of C++ was released on 14 October 1985.[11]

In 1983, the name of the language was changed from C with Classes to C++ (++ being the increment operator in C).New features were added including virtual functions, function name and operator overloading, references, constants,user-controlled free-store memory control, improved type checking, and BCPL style single-line comments with twoforward slashes (//). In 1985, the first edition of The C++ Programming Language was released, providing animportant reference to the language, as there was not yet an official standard.[12] Release 2.0 of C++ came in 1989and the updated second edition of The C++ Programming Language was released in 1991.[13] New features includedmultiple inheritance, abstract classes, static member functions, const member functions, and protected members. In1990, The Annotated C++ Reference Manual was published. This work became the basis for the future standard.Late feature additions included templates, exceptions, namespaces, new casts, and a Boolean type.As the C++ language evolved, the standard library evolved with it. The first addition to the C++ standard library wasthe stream I/O library which provided facilities to replace the traditional C functions such as printf and scanf. Later,among the most significant additions to the standard library, was a large amount of the Standard Template Library.C++ is sometimes called a hybrid language.[14]

It is possible to write object oriented or procedural code in the same program in C++. This has caused some concernthat some C++ programmers are still writing procedural code, but are under the impression that it is object oriented,simply because they are using C++. Often it is an amalgamation of the two. This usually causes most problems whenthe code is revisited or the task is taken over by another coder.[15]

C++ continues to be used and is one of the preferred programming languages to develop professionalapplications.[16]

EtymologyAccording to Stroustrup: "the name signifies the evolutionary nature of the changes from C".[17] During C++'sdevelopment period, the language had been referred to as "new C", then "C with Classes". The final name is creditedto Rick Mascitti (mid-1983) and was first used in December 1983. When Mascitti was questioned informally in 1992about the naming, he indicated that it was given in a tongue-in-cheek spirit. It stems from C's "++" operator (whichincrements the value of a variable) and a common naming convention of using "+" to indicate an enhanced computerprogram. A joke goes that the name itself has a bug: due to the use of post-increment, which increments the value ofthe variable but evaluates to the unincremented value, C++ is no better than C, and the pre-increment ++C formshould have been used instead.[18] There is no language called "C plus". ABCL/c+ was the name of an earlier,unrelated programming language. A few other languages have been named similarly to C++, notably C-- and C#.

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Standardization

Year C++ Standard Informal name

1998 ISO/IEC 14882:1998[19] C++98

2003 ISO/IEC 14882:2003[20] C++03

2007 ISO/IEC TR 19768:2007[21] C++TR1

2011 ISO/IEC 14882:2011[22] C++11

In 1998, the C++ standards committee (the ISO/IEC JTC1/SC22/WG21 working group) standardized C++ andpublished the international standard ISO/IEC 14882:1998 (informally known as C++98). For some years after theofficial release of the standard, the committee processed defect reports, and in 2003 published a corrected version ofthe C++ standard, ISO/IEC 14882:2003. In 2005, a technical report, called the "Library Technical Report 1" (oftenknown as TR1 for short), was released. While not an official part of the standard, it specified a number of extensionsto the standard library, which were expected to be included in the next version of C++.The latest major revision of the C++ standard, C++11, (formerly known as C++0x) was approved by ISO/IEC on 12August 2011.[23] It has been published as 14882:2011.[24] There are plans for a minor(C++14) and a major revision(C++17) in the future.[25]

C++14 is the name being used for the next revision. C++14 is planned to be a small extension over C++11, featuringmainly bug fixes and small improvements, similarly to how C++03 was a small extension to C++98. While the name'C++14' implies a release in 2014, this date is not fixed.

PhilosophyIn The Design and Evolution of C++ (1994), Bjarne Stroustrup describes some rules that he used for the design ofC++:• C++ is designed to be a statically typed, general-purpose language that is as efficient and portable as C• C++ is designed to directly and comprehensively support multiple programming styles (procedural programming,

data abstraction, object-oriented programming, and generic programming)• C++ is designed to give the programmer choice, even if this makes it possible for the programmer to choose

incorrectly•• C++ is designed to be compatible with C as much as possible, therefore providing a smooth transition from C•• C++ avoids features that are platform specific or not general purpose• C++ does not incur overhead for features that are not used (the "zero-overhead principle")•• C++ is designed to function without a sophisticated programming environmentInside the C++ Object Model (Lippman, 1996) describes how compilers may convert C++ program statements intoan in-memory layout. Compiler authors are, however, free to implement the standard in their own manner.

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Standard libraryThe 1998 ANSI/ISO C++ standard consists of two parts: the core language and the C++ Standard Library; the latterincludes most of the Standard Template Library (STL) and a slightly modified version of the C standard library.Many C++ libraries exist that are not part of the standard, and, using linkage specification, libraries can even bewritten in languages such as BASIC, C, Fortran, or Pascal. Which of these are supported is compiler-dependent.The C++ standard library incorporates the C standard library with some small modifications to make it optimizedwith the C++ language. Another large part of the C++ library is based on the STL. This provides such useful tools ascontainers (for example vectors and lists), iterators to provide these containers with array-like access and algorithmsto perform operations such as searching and sorting. Furthermore (multi)maps (associative arrays) and (multi)sets areprovided, all of which export compatible interfaces. Therefore it is possible, using templates, to write genericalgorithms that work with any container or on any sequence defined by iterators. As in C, the features of the libraryare accessed by using the #include directive to include a standard header. C++ provides 105 standard headers, ofwhich 27 are deprecated.The STL was originally a third-party library from HP and later SGI, before its incorporation into the C++ standard.The main architect behind STL is Alexander Stepanov, who experimented with generic algorithms and containers formany years. When he started with C++, he finally found a language where it was possible to create genericalgorithms (e.g., STL sort) that perform even better than, for example, the C standard library qsort, thanks to C++features like using inlining and compile-time binding instead of function pointers. The standard does not refer to it as"STL", as it is merely a part of the standard library, but many people still use that term to distinguish it from the restof the library (input/output streams, internationalization, diagnostics, the C library subset, etc.).Most C++ compilers provide an implementation of the C++ standard library, including the STL.Compiler-independent implementations of the STL, such as STLPort,[26] also exist. Other projects also producevarious custom implementations of the C++ standard library and the STL with various design goals.

Language featuresC++ inherits most of C's syntax. The following is Bjarne Stroustrup's version of the Hello world program that usesthe C++ Standard Library stream facility to write a message to standard output:[27][28]

# include <iostream>

int main()

{

std::cout << "Hello, world!\n";

}

Within functions that define a non-void return type, failure to return a value before control reaches the end of thefunction results in undefined behaviour (compilers typically provide the means to issue a diagnostic in such acase).[29] The sole exception to this rule is the main function, which implicitly returns a value of zero.[30]

Operators and operator overloading

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Operators that cannot be overloaded

Operator Symbol

Scope resolution operator ::

Conditional operator ?:

dot operator .

Member selection operator .*

"sizeof" operator sizeof

"typeid" operator typeid

C++ provides more than 35 operators, covering basic arithmetic, bit manipulation, indirection, comparisons, logicaloperations and others. Almost all operators can be overloaded for user-defined types, with a few notable exceptionssuch as member access (. and .*) as well as the conditional operator. The rich set of overloadable operators iscentral to using C++ as a domain-specific language. The overloadable operators are also an essential part of manyadvanced C++ programming techniques, such as smart pointers. Overloading an operator does not change theprecedence of calculations involving the operator, nor does it change the number of operands that the operator uses(any operand may however be ignored by the operator, though it will be evaluated prior to execution). Overloaded"&&" and "||" operators lose their short-circuit evaluation property.

TemplatesC++ templates enable generic programming. C++ supports both function and class templates. Templates may beparameterized by types, compile-time constants, and other templates. C++ templates are implemented byinstantiation at compile-time. To instantiate a template, compilers substitute specific arguments for a template'sparameters to generate a concrete function or class instance. Some substitutions are not possible; these are eliminatedby an overload resolution policy described by the phrase "Substitution failure is not an error" (SFINAE). Templatesare a powerful tool that can be used for generic programming, template metaprogramming, and code optimization,but this power implies a cost. Template use may increase code size, because each template instantiation produces acopy of the template code: one for each set of template arguments. This is in contrast to run-time generics seen inother languages (e.g., Java) where at compile-time the type is erased and a single template body is preserved.Templates are different from macros: while both of these compile-time language features enable conditionalcompilation, templates are not restricted to lexical substitution. Templates are aware of the semantics and typesystem of their companion language, as well as all compile-time type definitions, and can perform high-leveloperations including programmatic flow control based on evaluation of strictly type-checked parameters. Macros arecapable of conditional control over compilation based on predetermined criteria, but cannot instantiate new types,recurse, or perform type evaluation and in effect are limited to pre-compilation text-substitution andtext-inclusion/exclusion. In other words, macros can control compilation flow based on pre-defined symbols butcannot, unlike templates, independently instantiate new symbols. Templates are a tool for static polymorphism (seebelow) and generic programming.In addition, templates are a compile time mechanism in C++ that is Turing-complete, meaning that any computationexpressible by a computer program can be computed, in some form, by a template metaprogram prior to runtime.In summary, a template is a compile-time parameterized function or class written without knowledge of the specificarguments used to instantiate it. After instantiation, the resulting code is equivalent to code written specifically forthe passed arguments. In this manner, templates provide a way to decouple generic, broadly applicable aspects offunctions and classes (encoded in templates) from specific aspects (encoded in template parameters) without

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sacrificing performance due to abstraction.

ObjectsC++ introduces object-oriented programming (OOP) features to C. It offers classes, which provide the four featurescommonly present in OOP (and some non-OOP) languages: abstraction, encapsulation, inheritance, andpolymorphism. One distinguishing feature of C++ classes compared to classes in other programming languages issupport for deterministic destructors, which in turn provide support for the Resource Acquisition is Initializationconcept.

Encapsulation

Encapsulation is the hiding of information to ensure that data structures and operators are used as intended and tomake the usage model more obvious to the developer. C++ provides the ability to define classes and functions as itsprimary encapsulation mechanisms. Within a class, members can be declared as either public, protected, or private toexplicitly enforce encapsulation. A public member of the class is accessible to any function. A private member isaccessible only to functions that are members of that class and to functions and classes explicitly granted accesspermission by the class ("friends"). A protected member is accessible to members of classes that inherit from theclass in addition to the class itself and any friends.The OO principle is that all of the functions (and only the functions) that access the internal representation of a typeshould be encapsulated within the type definition. C++ supports this (via member functions and friend functions),but does not enforce it: the programmer can declare parts or all of the representation of a type to be public, and isallowed to make public entities that are not part of the representation of the type. Therefore, C++ supports not justOO programming, but other weaker decomposition paradigms, like modular programming.It is generally considered good practice to make all data private or protected, and to make public only those functionsthat are part of a minimal interface for users of the class. This can hide the details of data implementation, allowingthe designer to later fundamentally change the implementation without changing the interface in any way.[31][32]

Inheritance

Inheritance allows one data type to acquire properties of other data types. Inheritance from a base class may bedeclared as public, protected, or private. This access specifier determines whether unrelated and derived classes canaccess the inherited public and protected members of the base class. Only public inheritance corresponds to what isusually meant by "inheritance". The other two forms are much less frequently used. If the access specifier is omitted,a "class" inherits privately, while a "struct" inherits publicly. Base classes may be declared as virtual; this is calledvirtual inheritance. Virtual inheritance ensures that only one instance of a base class exists in the inheritance graph,avoiding some of the ambiguity problems of multiple inheritance.Multiple inheritance is a C++ feature not found in most other languages, allowing a class to be derived from morethan one base classes; this allows for more elaborate inheritance relationships. For example, a "Flying Cat" class caninherit from both "Cat" and "Flying Mammal". Some other languages, such as C# or Java, accomplish somethingsimilar (although more limited) by allowing inheritance of multiple interfaces while restricting the number of baseclasses to one (interfaces, unlike classes, provide only declarations of member functions, no implementation ormember data). An interface as in C# and Java can be defined in C++ as a class containing only pure virtual functions,often known as an abstract base class or "ABC". The member functions of such an abstract base class are normallyexplicitly defined in the derived class, not inherited implicitly. C++ virtual inheritance exhibits an ambiguityresolution feature called dominance.

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PolymorphismPolymorphism enables one common interface for many implementations, and for objects to act differently underdifferent circumstances.C++ supports several kinds of static (compile-time) and dynamic (run-time) polymorphisms. Compile-timepolymorphism does not allow for certain run-time decisions, while run-time polymorphism typically incurs aperformance penalty.

Static polymorphism

Function overloading allows programs to declare multiple functions having the same name (but with differentarguments). The functions are distinguished by the number or types of their formal parameters. Thus, the samefunction name can refer to different functions depending on the context in which it is used. The type returned by thefunction is not used to distinguish overloaded functions and would result in a compile-time error message.When declaring a function, a programmer can specify for one or more parameters a default value. Doing so allowsthe parameters with defaults to optionally be omitted when the function is called, in which case the defaultarguments will be used. When a function is called with fewer arguments than there are declared parameters, explicitarguments are matched to parameters in left-to-right order, with any unmatched parameters at the end of theparameter list being assigned their default arguments. In many cases, specifying default arguments in a singlefunction declaration is preferable to providing overloaded function definitions with different numbers of parameters.Templates in C++ provide a sophisticated mechanism for writing generic, polymorphic code. In particular, throughthe Curiously Recurring Template Pattern, it's possible to implement a form of static polymorphism that closelymimics the syntax for overriding virtual functions. Because C++ templates are type-aware and Turing-complete, theycan also be used to let the compiler resolve recursive conditionals and generate substantial programs throughtemplate metaprogramming. Contrary to some opinion, template code will not generate a bulk code after compilationwith the proper compiler settings.[33]

Dynamic polymorphism

Inheritance

Variable pointers (and references) to a base class type in C++ can refer to objects of any derived classes of that typein addition to objects exactly matching the variable type. This allows arrays and other kinds of containers to holdpointers to objects of differing types. Because assignment of values to variables usually occurs at run-time, this isnecessarily a run-time phenomenon.C++ also provides a dynamic_cast operator, which allows the program to safely attempt conversion of an objectinto an object of a more specific object type (as opposed to conversion to a more general type, which is alwaysallowed). This feature relies on run-time type information (RTTI). Objects known to be of a certain specific type canalso be cast to that type with static_cast, a purely compile-time construct that is faster and does not requireRTTI.

Virtual member functions

Ordinarily, when a function in a derived class overrides a function in a base class, the function to call is determined by the type of the object. A given function is overridden when there exists no difference in the number or type of parameters between two or more definitions of that function. Hence, at compile time, it may not be possible to determine the type of the object and therefore the correct function to call, given only a base class pointer; the decision is therefore put off until runtime. This is called dynamic dispatch. Virtual member functions or methods[34]

allow the most specific implementation of the function to be called, according to the actual run-time type of the object. In C++ implementations, this is commonly done using virtual function tables. If the object type is known, this may be bypassed by prepending a fully qualified class name before the function call, but in general calls to virtual

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functions are resolved at run time.In addition to standard member functions, operator overloads and destructors can be virtual. A general rule of thumbis that if any functions in the class are virtual, the destructor should be as well. As the type of an object at its creationis known at compile time, constructors, and by extension copy constructors, cannot be virtual. Nonetheless asituation may arise where a copy of an object needs to be created when a pointer to a derived object is passed as apointer to a base object. In such a case, a common solution is to create a clone() (or similar) virtual function thatcreates and returns a copy of the derived class when called.A member function can also be made "pure virtual" by appending it with = 0 after the closing parenthesis andbefore the semicolon. A class containing a pure virtual function is called an abstract data type. Objects cannot becreated from abstract data types; they can only be derived from. Any derived class inherits the virtual function aspure and must provide a non-pure definition of it (and all other pure virtual functions) before objects of the derivedclass can be created. A program that attempts to create an object of a class with a pure virtual member function orinherited pure virtual member function is ill-formed.

Parsing and processing C++ source codeIt is relatively difficult to write a good C++ parser with classic parsing algorithms such as LALR(1).[35] This is partlythe result of the C++ grammar not being LALR. Because of this, there are very few tools for analyzing or performingnon-trivial transformations (e.g., refactoring) of existing code. One way to handle this difficulty is to choose adifferent syntax. More powerful parsers, such as GLR parsers, can be substantially simpler (though slower).Parsing (in the literal sense of producing a syntax tree) is not the most difficult problem in building a C++ processingtool. Such tools must also have the same understanding of the meaning of the identifiers in the program as a compilermight have. Practical systems for processing C++ must then not only parse the source text, but be able to resolve foreach identifier precisely which definition applies (e.g., they must correctly handle C++'s complex scoping rules) andwhat its type is, as well as the types of larger expressions.Finally, a practical C++ processing tool must be able to handle the variety of C++ dialects used in practice (such asthat supported by the GNU Compiler Collection and that of Microsoft's Visual C++) and implement appropriateanalyzers, source code transformers, and regenerate source text. Combining advanced parsing algorithms such asGLR with symbol table construction and program transformation machinery can enable the construction of arbitraryC++ tools.

CompatibilityProducing a reasonably standards-compliant C++ compiler has proven to be a difficult task for compiler vendors ingeneral. For many years, different C++ compilers implemented the C++ language to different levels of compliance tothe standard, and their implementations varied widely in some areas such as partial template specialization. Recentreleases of most popular C++ compilers support almost all of the C++ 1998 standard.[36]

To give compiler vendors greater freedom, the C++ standards committee decided not to dictate the implementationof name mangling, exception handling, and other implementation-specific features. The downside of this decision isthat object code produced by different compilers is expected to be incompatible. There were, however, attempts tostandardize compilers for particular machines or operating systems (for example C++ ABI),[37] though they seem tobe largely abandoned now.

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Exported templatesOne particular point of contention is the export keyword, intended to allow template definitions to be separatedfrom their declarations. The first widely available compiler to implement export was Comeau C/C++, in early2003 (five years after the release of the standard); in 2004, the beta compiler of Borland C++ Builder X was alsoreleased with export. Both of these compilers are based on the EDG C++ front end. Other compilers such as GCCdo not support it at all. Beginning ANSI C++ by Ivor Horton provides example code with the keyword that will notcompile in most compilers, without reference to this problem. Herb Sutter, former convener of the C++ standardscommittee, recommended that export be removed from future versions of the C++ standard.[38] During the March2010 ISO C++ standards meeting, the C++ standards committee voted to remove exported templates entirely fromC++11, but reserve the keyword for future use.[39]

With CC++ is often considered to be a superset of C, but this is not strictly true.[40] Most C code can easily be made tocompile correctly in C++, but there are a few differences that cause some valid C code to be invalid or behavedifferently in C++.One commonly encountered difference is that C allows implicit conversion from void* to other pointer types, butC++ does not. Another common portability issue is that C++ defines many new keywords, such as new and class,that may be used as identifiers (e.g., variable names) in a C program.Some incompatibilities have been removed by the 1999 revision of the C standard (C99), which now supports C++features such as line comments (//), and mixed declarations and code. On the other hand, C99 introduced a numberof new features that C++ did not support, such as variable-length arrays, native complex-number types, designatedinitializers, and compound literals.[41] However, at least some of the C99-introduced features were included in thesubsequent version of the C++ standard, C++11:[42][43]

• C99 preprocessor (including variadic macros, wide/narrow literal concatenation, wider integer arithmetic)•• _Pragma()

•• long long

•• __func__

•• Headers:• cstdbool (stdbool.h)• cstdint (stdint.h)• cinttypes (inttypes.h).

To intermix C and C++ code, any function declaration or definition that is to be called from/used both in C and C++must be declared with C linkage by placing it within an extern "C" {/*...*/} block. Such a function maynot rely on features depending on name mangling (i.e., function overloading).

CriticismDue to its large feature set and oft-perceived "strict" syntax, the language is sometimes criticized as being overlycomplicated and thus difficult to fully master.[44]

C++ is sometimes compared unfavorably with more strictly object-oriented languages on the basis that it enablesprogrammers to "mix and match" declarative, functional, generic, modular, and procedural programming styles withobject-oriented programming, rather than strictly enforcing a single style, although C++ is intentionally amulti-paradigm language.[1]

A widely distributed satirical article portrayed Bjarne Stroustrup, interviewed for a 1998 issue of IEEE's Computer magazine,[45] confessing that C++ was deliberately designed to be complex and difficult, weeding out amateur programmers and raising the salaries of the few programmers who could master the language. The FAQ section of

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Stroustrup's personal website contains a denial and a link to the actual interview.[46]

Richard Stallman criticizes C++ for having ambiguous grammar and "gratuitous, trivial incompatibilities with C [...]that are of no great benefit".[47]

Linus Torvalds has said, "C++ is a horrible language. It's made more horrible by the fact that a lot of substandardprogrammers use it".[48]

Finally, several authors have remarked that C++ is not a true object-oriented language.The same problem occurs with programming languages. As stated earlier, many C programmers moved intothe realm of object orientation by migrating to C++ before being directly exposed to OO concepts. This wouldalways come out in an interview. Many times developers who claim to be C++ programmers are simply Cprogrammers using C++ compilers. [...] We have already mentioned that C++ is not a true object-orientedprogramming language but is actually an object-based programming language. Remember that C++ isconsidered to be object-based. Object-oriented concepts are not enforced. You can write a non-object-orientedC program using a C++ compiler.—Matt Weisfeld, [49]

It is interesting to see what is being done out in the world under the name object-oriented. I have been shownsome very, very strange looking pieces of code over the years, by various people, including people inuniversities, that they have said is OOP code written in an OOP language—and actually I made up the termobject-oriented, and I can tell you, I didn't have C++ in mind.—Alan Kay, Smalltalk co-creator, [50]

References[1] Stroustrup, Bjarne (1997). "1". The C++ Programming Language (Third ed.). ISBN 0-201-88954-4. OCLC 59193992.[2] Naugler, David (May 2007). "C# 2.0 for C++ and Java programmer: conference workshop". Journal of Computing Sciences in Colleges 22

(5). "Although C# has been strongly influenced by Java it has also been strongly influenced by C++ and is best viewed as a descendant of bothC++ and Java."

[3] http:/ / isocpp. org/[4] Schildt, Herbert (1 August 1998). C++ The Complete Reference (Third ed.). Osborne McGraw-Hill. ISBN 978-0-07-882476-0.[5] Stroustrup, Bjarne (7 March 2010). "C++ Faq: When was C++ Invented" (http:/ / www2. research. att. com/ ~bs/ bs_faq. html#invention).

ATT.com. . Retrieved 16 September 2010.[6] "Programming Language Popularity" (http:/ / www. langpop. com/ ). 2009. . Retrieved 16 January 2009.[7] "TIOBE Programming Community Index" (http:/ / www. tiobe. com/ index. php/ content/ paperinfo/ tpci/ index. html). 2009. . Retrieved 3

August 2011.[8] C++ Applications (http:/ / www2. research. att. com/ ~bs/ applications. html)[9] "What's CvSDL?" (http:/ / www. cvsdl. com/ ). : cvsdl. . Retrieved 8 March 2010. "CvSDL was introduced in 2003 as a C++ class framework

with Verilog features that worked like a Verilog simulator. Since then it has been revamped to be a standard-compliant HDL simulator,currently supporting Verilog. It is capable of cosimulating with SystemC. It can be used just as an HDL simulator or to generate executablespecifications written in Verilog and SystemC on the hardware side and in C, C++ and SystemC on the software side."

[10] "ISO/IEC 14882:2011" (http:/ / www. iso. org/ iso/ iso_catalogue/ catalogue_ics/ catalogue_detail_ics. htm?ics1=35& ics2=60& ics3=&csnumber=50372). ISO. . Retrieved 3 September 2011.

[11] "Bjarne Stroustrup's FAQ – When was C++ invented?" (http:/ / public. research. att. com/ ~bs/ bs_faq. html#invention). . Retrieved 30 May2006.

[12] Stroustrup, Bjarne. "The C++ Programming Language" (http:/ / www2. research. att. com/ ~bs/ 1st. html). . Retrieved 16 September 2010.[13] Stroustrup, Bjarne. "The C++ Programming Language" (http:/ / www2. research. att. com/ ~bs/ 2nd. html). . Retrieved 16 September 2010.[14] Voegele, Jason. "Programming Language Comparison" (http:/ / www. jvoegele. com/ software/ langcomp. html). . Retrieved 7 April 2011.[15] Bhatti, M. U.; Ducasse, S.; Rashid, A. (June 2008). "Aspect Mining in Procedural Object Oriented Code" (http:/ / scg. unibe. ch/ archive/

external/ Bhat08a-ICPC2008-AspectMining. pdf). Proceedings of the International Conference on Program Comprehension: 230–235.doi:10.1109/ICPC.2008.45. . Retrieved 19 December 2011.

[16] "Most Popular Programming Languages" (http:/ / langpop. com). . Retrieved 7 September 2011.[17] "Bjarne Stroustrup's FAQ – Where did the name "C++" come from?" (http:/ / public. research. att. com/ ~bs/ bs_faq. html#name). .

Retrieved 16 January 2008.[18] Rishoo Mittal (12/04/2010). "The bug in the name of the C++ language." (http:/ / www. geekscontactee. com/ 2010/ 12/

bug-in-name-of-c-language. html). Tech Zombies (http:/ / www. geekscontactee. com/ ). . Retrieved ~~~~~.

C++ 11

[19] "ISO/IEC 14882:1998" (http:/ / www. iso. org/ iso/ iso_catalogue/ catalogue_ics/ catalogue_detail_ics. htm?ics1=35& ics2=60& ics3=&csnumber=25845). .

[20] "ISO/IEC 14882:2003" (http:/ / www. iso. org/ iso/ iso_catalogue/ catalogue_ics/ catalogue_detail_ics. htm?ics1=35& ics2=60& ics3=&csnumber=38110). .

[21] "ISO/IEC TR 19768:2007" (http:/ / www. iso. org/ iso/ iso_catalogue/ catalogue_ics/ catalogue_detail_ics. htm?ics1=35& ics2=60& ics3=&csnumber=43289). .

[22] "ISO/IEC 14882:2011" (http:/ / www. iso. org/ iso/ iso_catalogue/ catalogue_ics/ catalogue_detail_ics. htm?ics1=35& ics2=60& ics3=&csnumber=50372). .

[23] We have an international standard: C++0x is unanimously approved « Sutter’s Mill (http:/ / herbsutter. com/ 2011/ 08/ 12/we-have-an-international-standard-c0x-is-unanimously-approved/ )

[24] "ISO/IEC 14882:2011" (http:/ / www. iso. org/ iso/ iso_catalogue/ catalogue_tc/ catalogue_detail. htm?csnumber=50372). ISO. 2 September2011. . Retrieved 3 September 2011.

[25] "The Future of C++" (http:/ / channel9. msdn. com/ Events/ Build/ 2012/ 2-005). .[26] STLPort home page (http:/ / www. stlport. org/ ), quote from "The C++ Standard Library" by Nicolai M. Josuttis, p138., ISBN

0-201-37926-0, Addison-Wesley, 1999: "An exemplary version of STL is the STLport, which is available for free for any platform"[27] Stroustrup, Bjarne (2000). The C++ Programming Language (Special ed.). Addison-Wesley. p. 46. ISBN 0-201-70073-5.[28] Open issues for The C++ Programming Language (3rd Edition) (http:/ / www. research. att. com/ ~bs/ 3rd_issues. html) – This code is

copied directly from Bjarne Stroustrup's errata page (p. 633). He addresses the use of '\n' rather than std::endl. Also seewww.research.att.com (http:/ / www. research. att. com/ ~bs/ bs_faq2. html#void-main) for an explanation of the implicit return 0; in themain function. This implicit return is not available in other functions.

[29] ISO/IEC (2003). ISO/IEC 14882:2003(E): Programming Languages – C++ §6.6.3 The return statement [stmt.return] para. 2[30] ISO/IEC (2003). ISO/IEC 14882:2003(E): Programming Languages – C++ §3.6.1 Main function [basic.start.main] para. 5[31] Sutter, Herb; Alexandrescu, Andrei (2004). C++ Coding Standards: 101 Rules, Guidelines, and Best Practices. Addison-Wesley.[32] Henricson, Mats; Nyquist, Erik (1997). Industrial Strength C++. Prentice Hall. ISBN 0-13-120965-5.[33] "Nobody Understands C++: Part 5: Template Code Bloat" (http:/ / blog. emptycrate. com/ node/ 307). http:/ / blog. emptycrate. com/ :

EmptyCrate Software. Travel. Stuff.. 6 May 2008. . Retrieved 8 March 2010. "On occasion you will read or hear someone talking about C++templates causing code bloat. I was thinking about it the other day and thought to myself, "self, if the code does exactly the same thing thenthe compiled code cannot really be any bigger, can it?" [...] And what about compiled code size? Each were compiled with the command g++<filename>.cpp -O3. Non-template version: 8140 bytes, template version: 8028 bytes!"

[34] Stroustrup, Bjarne (2000). The C++ Programming Language (Special ed.). Addison-Wesley. p. 310. ISBN 0-201-70073-5. "A virtualmember function is sometimes called a method."

[35] Birkett, Andrew. "Parsing C++ at nobugs.org" (http:/ / www. nobugs. org/ developer/ parsingcpp/ ). Nobugs.org. . Retrieved 3 July 2009.[36] Sutter, Herb (15 April 2003). "C++ Conformance Roundup" (http:/ / www. ddj. com/ dept/ cpp/ 184401381). Dr. Dobb's Journal. .

Retrieved 30 May 2006.[37] "C++ ABI" (http:/ / www. codesourcery. com/ cxx-abi/ ). . Retrieved 30 May 2006.[38] Why We Can’t Afford Export (http:/ / www. open-std. org/ jtc1/ sc22/ wg21/ docs/ papers/ 2003/ n1426. pdf) PDF (266 KB)[39] Sutter, Herb (13 March 2010). "Trip Report: March 2010 ISO C++ Standards Meeting" (http:/ / herbsutter. com/ 2010/ 03/ 13/

trip-report-march-2010-iso-c-standards-meeting/ ). . Retrieved 8 April 2010.[40] "Bjarne Stroustrup's FAQ – Is C a subset of C++?" (http:/ / public. research. att. com/ ~bs/ bs_faq. html#C-is-subset). . Retrieved 18 January

2008.[41] "C9X – The New C Standard" (http:/ / home. datacomm. ch/ t_wolf/ tw/ c/ c9x_changes. html). . Retrieved 27 December 2008.[42] "C++0x Support in GCC" (http:/ / gcc. gnu. org/ projects/ cxx0x. html). . Retrieved 12 October 2010.[43] "C++0x Core Language Features In VC10: The Table" (http:/ / blogs. msdn. com/ b/ vcblog/ archive/ 2010/ 04/ 06/

c-0x-core-language-features-in-vc10-the-table. aspx). . Retrieved 12 October 2010.[44] Morris, Richard (2 July 2009). "Niklaus Wirth: Geek of the Week" (http:/ / www. simple-talk. com/ opinion/ geek-of-the-week/

niklaus-wirth-geek-of-the-week/ ). . Retrieved 8 August 2009. "C++ is a language that was designed to cater to everybody’s perceived needs.As a result, the language and even more so its implementations have become complex and bulky, difficult to understand, and likely to containerrors for ever."

[45] Unattributed. Previously unpublished interview with Bjarne Stroustroup, designer of C++ (http:/ / harmful. cat-v. org/ software/ c+ + /I_did_it_for_you_all).

[46] Stroustrup, Bjarne. Stroustrup FAQ: Did you really give an interview to IEEE? (http:/ / www2. research. att. com/ ~bs/ bs_faq. html#IEEE)[47] "Stallman Lecture in Lund, Sweden 2000-02-11, part 2, transcription" (http:/ / ftp. fukt. bsnet. se/ pub/ movies/ stallman/ stallman2c. sub).

Datorföreningen vid Lunds universitet och Lunds tekniska högskola. 11 February 2000. . Retrieved 16 January 2010.[48] Torvalds, Linus (6 September 2007). "Re: [RFC] Convert builtin-mailinfo.c to use The Better String Library" (http:/ / thread. gmane. org/

gmane. comp. version-control. git/ 57643/ focus=57918). git mailing list. . Retrieved 15 March 2011.[49] Weisfeld, Matt (2009). The Object-Oriented Thought Process (http:/ / books. google. ca/ books?id=9PIoRAbsmBMC& pg=PT350) (third

ed.). Pearson Education. .[50] Kay, Alan (1997). Alan Kay: The Computer Revolution Hasn't Happend Yet. Keynote OOPSLA 1997 (http:/ / video. google. com/

videoplay?docid=-2950949730059754521). Event occurs at 10:00. .

C++ 12

Further reading• Abrahams, David; Gurtovoy, Aleksey. C++ Template Metaprogramming: Concepts, Tools, and Techniques from

Boost and Beyond. Addison-Wesley. ISBN 0-321-22725-5.• Alexandrescu, Andrei (2001). Modern C++ Design: Generic Programming and Design Patterns Applied.

Addison-Wesley. ISBN 0-201-70431-5.• Alexandrescu, Andrei; Sutter, Herb (2004). C++ Design and Coding Standards: Rules and Guidelines for

Writing Programs. Addison-Wesley. ISBN 0-321-11358-6.• Becker, Pete (2006). The C++ Standard Library Extensions : A Tutorial and Reference. Addison-Wesley.

ISBN 0-321-41299-0.• Brokken, Frank (2010). C++ Annotations (http:/ / www. icce. rug. nl/ documents/ cplusplus/ ). University of

Groningen. ISBN 90-367-0470-7.• Coplien, James O. (1992, reprinted with corrections 1994). Advanced C++: Programming Styles and Idioms.

ISBN 0-201-54855-0.• Dewhurst, Stephen C. (2005). C++ Common Knowledge: Essential Intermediate Programming. Addison-Wesley.

ISBN 0-321-32192-8.• Information Technology Industry Council (15 October 2003). Programming languages – C++ (Second ed.).

Geneva: ISO/IEC. 14882:2003(E).• Josuttis, Nicolai M. (2012). The C++ Standard Library, A Tutorial and Reference (Second ed.). Addison-Wesley.

ISBN 0-321-62321-5.• Koenig, Andrew; Moo, Barbara E. (2000). Accelerated C++ – Practical Programming by Example.

Addison-Wesley. ISBN 0-201-70353-X.• Lippman, Stanley B.; Lajoie, Josée; Moo, Barbara E. (2011). C++ Primer (Fifth ed.). Addison-Wesley.

ISBN 0-470-93244-9.• Lippman, Stanley B. (1996). Inside the C++ Object Model. Addison-Wesley. ISBN 0-201-83454-5.• Meyers, Scott (2005). Effective C++ (Third ed.). Addison-Wesley. ISBN 0-321-33487-6.• Stroustrup, Bjarne (2000). The C++ Programming Language (Special ed.). Addison-Wesley.

ISBN 0-201-70073-5.• Stroustrup, Bjarne (1994). The Design and Evolution of C++. Addison-Wesley. ISBN 0-201-54330-3.• Stroustrup, Bjarne (2009). Programming Principles and Practice Using C++. Addison-Wesley.

ISBN 0-321-54372-6.• Sutter, Herb (2001). More Exceptional C++: 40 New Engineering Puzzles, Programming Problems, and

Solutions. Addison-Wesley. ISBN 0-201-70434-X.• Sutter, Herb (2004). Exceptional C++ Style. Addison-Wesley. ISBN 0-201-76042-8.• Vandevoorde, David; Josuttis, Nicolai M. (2003). C++ Templates: The complete Guide. Addison-Wesley.

ISBN 0-201-73484-2.

C++ 13

External links• JTC1/SC22/WG21 (http:/ / www. open-std. org/ jtc1/ sc22/ wg21/ ) – The ISO/IEC C++ Standard Working

Group• n3242.pdf (http:/ / www. open-std. org/ jtc1/ sc22/ wg21/ docs/ papers/ 2011/ n3242. pdf) – Final Committee

Draft of "ISO/IEC IS 14882 – Programming Languages – C++" (28 February 2011)• A paper by Stroustrup showing the timeline of C++ evolution (1979–1991) (http:/ / www. research. att. com/ ~bs/

hopl2. pdf)• Bjarne Stroustrup's C++ Style and Technique FAQ (http:/ / www. research. att. com/ ~bs/ bs_faq2. html)• C++ FAQ Lite by Marshall Cline (http:/ / www. parashift. com/ c+ + -faq-lite/ )• C++ FQA Lite – Yossi Kreinin (http:/ / yosefk. com/ c+ + fqa/ )• Hamilton, Naomi (25 June 2008). "The A-Z of Programming Languages: C++" (http:/ / www. computerworld.

com. au/ article/ 250514/ -z_programming_languages_c?pp=1& fp=16& fpid=1). Computerworld. Interview withBjarne Stroustrup.

• Kalev, Danny (15 August 2008). "The State of the Language: An Interview with Bjarne Stroustrup" (http:/ /www. devx. com/ SpecialReports/ Article/ 38813/ 0/ page/ 1). DevX (QuinStreet Inc.).

• Katdare, Kaustubh (1 February 2008). "Dr. Bjarne Stroustrup – Inventor of C++" (http:/ / www. crazyengineers.com/ dr-bjarne-stroustrup-inventor-of-c/ ). CrazyEngineers.

• Code practices for not breaking binary compatibility between releases of C++ libraries (http:/ / techbase. kde. org/Policies/ Binary_Compatibility_Issues_With_C+ + ) (from KDE Techbase)

• The Standard C++ Foundation (http:/ / isocpp. org/ ) is a not-for-profit organization that promotes the use andunderstanding of standard C++. Bjarne Stroustrup is a director of the organization.

Article Sources and Contributors 14

Article Sources and ContributorsC++  Source: http://en.wikipedia.org/w/index.php?oldid=531500963  Contributors: -Barry-, 12.21.224.xxx, 1exec1, 223ankher, 2602:306:CC83:4AE0:F1B7:DED:14B7:FA4B, 28bytes, 4jobs,4th-otaku, 7DaysForgotten, @modi, A D Monroe III, A Jav, A.A.Graff, AIOS, ALOTOFTOMATOES, AMackenzie, AOC25, ARSchmitz, AThing, ATren, Aandu, Abdull, Abi79, Abledsoe78,Abolitionhf, Access Denied, Adam12901, Addihockey10, Adi211095, Adorno rocks, Adrianwn, Ae-a, Aesopos, AgadaUrbanit, Agasta, AgentFriday, Ahmadmashhour, Ahoerstemeier, Ahy1,Akeegazooka, Akersmc, Akhristov, Akihabara, Akuyume, Alan D, Alan Liefting, AlbertCahalan, AlecSchueler, Aleenf1, AleksanderVatov, AlexKarpman, Alexf, Alexius08, Alexkon, Alfio,Alhoori, Aliekens, AlistairMcMillan, Allstarecho, Alpha Quadrant (alt), AltiusBimm, Alxeedo, AnAccount2, AnOddName, Andante1980, Andre Engels, Andreaskem, Andrew Delong, Andrew1,AndrewHowse, AndrewKepert, Andyluciano, Angbor, AngelOfSadness, Angela, Anoko moonlight, AnonMoos, Anonymous Dissident, Antandrus, Aparna.amar.patil, Apexofservice,Apokryltaros, Arabic Pilot, Aragorn2, Arcadie, Arctic.gnome, Ardonik, ArglebargleIV, AshishDandekar7, Asimzb, Astrobunny, Astronautics, Atjesse, Atlant, Auntof6, Austin Hair, Autopilot,Avoran, Axecution, AxelBoldt, BD2412, BMW Z3, Baa, Babija, Babjisit, Backdoor2world, Bahram.zahir, Barek, Barkha dhamechai, Baronnet, Bart133, Bartosz, Bdragon, Belem tower,BenFrantzDale, Benhocking, Bento00, Beowulf king, Bevo, Beyondthislife, Bfzhao, Bhahas, Biblioth3que, Bigk105, Bill gates69, Billj321, Billyoneal, Bineet, Bkil, Blaisorblade, Bluemoose,Bluezy, Bobazoid, Bobblewik, Bober71, Bobo192, Bobthebill, Bodkinator, Boffob, Boing! said Zebedee, Bomarrow1, Bonadea, Bongwarrior, Booklegger, Boseko, Bovineone, Brion VIBBER,Btx40, C Labombard, C++ Template, C.Fred, CALR, CIreland, CPMcE, CRGreathouse, CTZMSC3, CWY2190, Caesura, Caiaffa, Callek, Caltas, Can't sleep, clown will eat me, CanisRufus,Canthusus, Cap'n Refsmmat, Capi crimm, CapitalR, Capricorn42, Captainhampton, Carabinieri, Carbon editor, Card Zero, Carlson-steve, Carnivorousfungi, Catgut, Cathack, CecilWard, Cedars,CesarB, Cetinsert, Cfeet77, Cflm001, Cgranade, Chaos5023, CharlotteWebb, Chealer, Cherkash, ChessKnught, Chocolateboy, ChrisGualtieri, Chrisandtaund, Christian List, Chuq, Ckburke,Clay, Cleared as filed, Closedmouth, Clsdennis2007, Coasterlover1994, Code-Analysis, Cometstyles, Comperr, Conversion script, Coolwanglu, Coosbane, Coq Rouge, CordeliaNaismith,Corrector7007, Corti, Cowsnatcher27, Cpiral, Craig Stuntz, Crashnburn2007, Crotmate, Csmaster2005, Ctu2485, Cubbi, Curb Chain, Curps, Cwitty, Cybercobra, Cyclonenim, Cyde,CyrilleDunant, Cyrius, DAGwyn, DJ Clayworth, DVD R W, DVdm, Dallison999, Damian Yerrick, Damien.c.sadler, Dan Brown123, Dan Harkless, Dan100, Danakil, Danger, Daniel Earwicker,Daniel.Cardenas, DanielNuyu, Danim, Darestium, Dario D., DarkHorizon, Darkmonkeyz321, Darolew, Dave Runger, Daverose 33, David A Bozzini, David H Braun (1964), Davidking20, DawnBard, Dawnseeker2000, Dch888, Dcoetzee, De728631, Decltype, Deflective, Deibid, Delirium, Delldot, Demonkoryu, Denelson83, DerHexer, Derek Ross, Deryck Chan, DevSolar,DevastatorIIC, Devengosalia514, Dewritech, Dibash, DigitalMediaSage, Dirkbb, Discospinster, Dlae, Dlfkja;lskj, Dmharvey, Dnstory, Dogcow, DominicConnor, DonelleDer, Donhalcon,Doofenschmirtzevilinc, DopeWare, DoubleRing, Doug Bell, Dougjih, Doulos Christos, Drangon, Drewcifer3000, Drrngrvy, Dylnuge, Dysprosia, Dystopiavirus, E Wing, ESkog, Eagleal,Ebeisher, Eco84, Ecstatickid, Ed Brey, Editorplus123, Edward Z. Yang, Eelis, Eelis.net, Ehn, Elitewinner, Elliskev, Elysdir, Enarsee, EncMstr, Enerjazzer, EngineerScotty, Entropy, Eric119,ErikHaugen, Esanchez7587, Esben, Esmito, Esrogs, Eternaldescent08, Ethan, EvanED, Evanh2008, Evice, Evil Monkey, Ewok18, ExcessPhase, Excirial, FW4NK, Fa2sA, FaTony, Face,Facorread, Faithlessthewonderboy, Faizni, Falcon300000, Fanf, Fashionslide, FatalError, Favonian, Fistboy, Fizzackerly, Flamingantichimp, Flewis, Flex, Fluffernutter, Flyingprogrammer,FrancoGG, Franl, Freakofnurture, Frecklefoot, Free Software Knight, Fresheneesz, Fritzpoll, Ftbhrygvn, Furby100, Furrykef, Fuzzybyte, Fyyer, GDallimore, GENtLe, GLari, GarethGriffith-Jones, Gaul, Gauss, Geeoharee, Gene.thomas, Gengiskanhg, Georg Peter, Giftlite, Gil mo, Gildos, Gilgamesh, Gilliam, Gimili2, Glacialfox, God Of All, Gogo Dodo, GoingBatty,GoodSirJava, GorillaWarfare, Graue, Greatdebtor, GregorB, Gremagor, Grenavitar, Grey GosHawk, Grigor The Ox, GroovySandwich, Gsonnenf, Gusmoe, Gwern, Gwjames, Hairy 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