Difference between revisions of "cpp/keyword"

Revision as of 07:22, 11 August 2024

This is a list of reserved keywords in C++. Since they are used by the language, these keywords are not available for re-definition or overloading. As an exception, they are not considered reserved in attributes (excluding attribute argument lists).(since C++11)

A – C	D – P	R – Z
`alignas` (C++11) `alignof` (C++11) `and` `and_eq` `asm` `atomic_cancel` (TM TS) `atomic_commit` (TM TS) `atomic_noexcept` (TM TS) `auto` (1) (2) (3) (4) `bitand` `bitor` `bool` `break` `case` `catch` `char` `char8_t` (C++20) `char16_t` (C++11) `char32_t` (C++11) `class` (1) `compl` `concept` (C++20) `const` `consteval` (C++20) `constexpr` (C++11) `constinit` (C++20) `const_cast` `continue` `co_await` (C++20) `co_return` (C++20) `co_yield` (C++20)	`decltype` (C++11) `default` (1) `delete` (1) `do` `double` `dynamic_cast` `else` `enum` (1) `explicit` `export` (1) (3) `extern` (1) `false` `float` `for` (1) `friend` `goto` `if` (2) (4) `inline` (1) `int` `long` `mutable` (1) `namespace` `new` `noexcept` (C++11) `not` `not_eq` `nullptr` (C++11) `operator` (1) `or` `or_eq` `private` (3) `protected` `public`	`reflexpr` (reflection TS) `register` (2) `reinterpret_cast` `requires` (C++20) `return` `short` `signed` `sizeof` (1) `static` `static_assert` (C++11) `static_cast` `struct` (1) `switch` `synchronized` (TM TS) `template` `this` (4) `thread_local` (C++11) `throw` `true` `try` `typedef` `typeid` `typename` `union` `unsigned` `using` (1) `virtual` `void` `volatile` `wchar_t` `while` `xor` `xor_eq`

(1) — meaning changed or new meaning added in C++11.
(2) — meaning changed or new meaning added in C++17.
(3) — meaning changed or new meaning added in C++20.
(4) — new meaning added in C++23.

Note that and, bitor, or, xor, compl, bitand, and_eq, or_eq, xor_eq, not, and not_eq (along with the digraphs <%, %>, <:, :>, %:, and %:%:) provide an alternative way to represent standard tokens. These keywords are also considered reserved in attributes (excluding attribute argument lists), but some implementations handle them the same as the others.(since C++11)

In addition to keywords, there are identifiers with special meaning, which may be used as names of objects or functions, but have special meaning in certain contexts.

`final` (C++11) `override` (C++11) `transaction_safe` (TM TS) `transaction_safe_dynamic` (TM TS) `import` (C++20) `module` (C++20)

Also, all identifiers that contain a double underscore __ in any position and each identifier that begins with an underscore followed by an uppercase letter is always reserved and all identifiers that begin with an underscore are reserved for use as names in the global namespace. See identifiers for more details.

The namespace std is used to place names of the standard C++ library. See Extending namespace std for the rules about adding names to it.

The name posix is reserved for a future top-level namespace. The behavior is undefined if a program declares or defines anything in that namespace.

(since C++11)

The following tokens are recognized by the preprocessor when in context of a preprocessor directive:

`if` `elif` `else` `endif`	`ifdef` `ifndef` `elifdef` (C++23) `elifndef` (C++23)	`define` `undef` `include` `line`	`error` `warning` (C++23) `pragma`	`defined` `__has_include` (C++17) `__has_cpp_attribute` (C++20)	`export` (C++20) `import` (C++20) `module` (C++20)

The following tokens are recognized by the preprocessor outside the context of a preprocessor directive:

`_Pragma` (C++11)

@@ Line 14: / Line 14: @@
 {{rlt|and_eq}}<br>
 {{rlt|asm}}<br>
-{{ltt|cpp/language/transactional memory|atomic_cancel}} {{mark since tm ts}}<br>
+{{rlt|atomic_cancel}} {{mark since tm ts}}<br>
-{{ltt|cpp/language/transactional memory|atomic_commit}} {{mark since tm ts}}<br>
+{{rlt|atomic_commit}} {{mark since tm ts}}<br>
-{{ltt|cpp/language/transactional memory|atomic_noexcept}} {{mark since tm ts}}<br>
+{{rlt|atomic_noexcept}} {{mark since tm ts}}<br>
 {{rlt|auto}} {{mark|1}} {{mark|2}} {{mark|3}} {{mark|4}}<br>
 {{rlt|bitand}}<br>
@@ Line 88: / Line 88: @@
 {{rlt|struct}} {{mark|1}}<br>
 {{rlt|switch}}<br>
-{{ltt|cpp/language/transactional memory|synchronized}} {{mark since tm ts}}<br>
+{{rlt|synchronized}} {{mark since tm ts}}<br>
 {{rlt|template}}<br>
 {{rlt|this}} {{mark|4}}<br>
@@ Line 123: / Line 123: @@
 {{ltt|cpp/language/final}} {{mark c++11}}<br>
 {{ltt|cpp/language/override}} {{mark c++11}}<br>
-{{ltt|cpp/language/transactional memory|transaction_safe}} {{mark since tm ts}}<br>
+{{rlt|transaction_safe}} {{mark since tm ts}}<br>
-{{ltt|cpp/language/transactional memory|transaction_safe_dynamic}} {{mark since tm ts}}<br>
+{{rlt|transaction_safe_dynamic}} {{mark since tm ts}}<br>
 {{rlt|import}} {{mark c++20}}<br>
 {{rlt|module}} {{mark c++20}}

Compiler support
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Language
Standard library
Standard library headers
Named requirements
Feature test macros (C++20)
Language support library
Concepts library (C++20)
Metaprogramming library (C++11)
Diagnostics library
General utilities library
Strings library
Containers library
Iterators library
Ranges library (C++20)
Algorithms library
Numerics library
Localizations library
Input/output library
Filesystem library (C++17)
Regular expressions library (C++11)
Concurrency support library (C++11)
Execution support library (C++26)
Technical specifications
Symbols index
External libraries

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Difference between revisions of "cpp/keyword"

Revision as of 07:22, 11 August 2024

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