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Reserved keywords in C++?
A reserved word is a word that cannot be used as an identifier, such as the name of a variable, function, or label – it is "reserved from use". This is a syntactic definition, and a reserved word may have no meaning.
There are a total of 95 reserved words in C++. The reserved words of C++ may be conveniently placed into several groups. In the first group, we put those that were also present in the C programming language and have been carried over into C++. There are 32 of these.
There are another 30 reserved words that were not in C, are therefore new to C++ programming language.
There are 11 C++ reserved words that are not essential when the standard ASCII character set is being used, but they have been added to provide more readable alternatives for a few of the C++ operators, and also to facilitate programming with character sets that lack characters required by C++.
Here is a list of all these reserved words −
| alignas (since C++11) | alignof (since C++11) | and |
| and | and_eq | asm |
| atomic_cancel (TM TS) | atomic_commit (TM TS) | atomic_noexcept (TM TS) |
| auto(1) | bitand | bitor |
| bool | break | case |
| catch | char | char16_t (since C++11) |
| char32_t (since C++11) | class(1) | compl |
| concept (since C++20) | const | constexpr (since C++11) |
| const_cast | continue | co_await (coroutines TS) |
| co_return (coroutines TS) | co_yield (coroutines TS) | decltype (since C++11) |
| default(1) | delete(1) | do |
| double | dynamic_cast | else |
| enum | explicit | export(1) |
| extern(1) | false | float |
| for | friend | goto |
| if | import (modules TS) | inline(1) |
| int | long | module (modules TS) |
| mutable(1) | namespace | new |
| noexcept (since C++11) | not | not_eq |
| nullptr (since C++11) | operator | or |
| or_eq | private | protected |
| public | register(2) | reinterpret_cast |
| requires (since C++20) | return | short |
| signed | sizeof(1) | static |
| static_assert (since C++11) | static_cast | struct(1) |
| switch | synchronized (TM TS) | template |
| this | thread_local (since C++11) | throw |
| true | try | typedef |
| typeid | typename | union |
| unsigned | using(1) | virtual |
| void | volatile | wchar_t |
| while | xor | xor_eq |
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