![]() ![]() template name with template arguments (optionally qualified, optionally using template disambiguator).previously declared typedef-name or type alias (since C++11) (optionally qualified).previously declared enum name (optionally qualified).previously declared class name (optionally qualified).char, char8_t, (since C++20) char16_t, char32_t, (since C++11) wchar_t, bool, short, int, long, signed, unsigned, float, double, void.Only the following specifiers are part of type-specifier-seq, in any order: This sequence of specifiers is also used by type-id. The type of every entity introduced by the declaration is this type, optionally modified by the declarator (see below). Type specifiers ( type-specifier-seq), a sequence of specifiers that names a type.Only one storage class specifier is allowed, except that thread_local may appear together with extern or static. storage class specifier ( register, (until C++17) static, thread_local, (since C++11) extern, mutable).At most one of the constexpr, consteval, and constinit specifiers is allowed to appear in a decl-specifier-seq. the constinit specifier, only allowed in declaration of a variable with static or thread storage duration. ![]() ![]() the consteval specifier, only allowed in function and function template declarations.the constexpr specifier, only allowed in variable definitions, function and function template declarations, and the declaration of static data members of literal type.the friend specifier, allowed in class and function declarations.the inline specifier is also allowed on variable declarations.function specifiers ( inline, virtual, explicit), only allowed in function declarations.If present, the entire declaration is a typedef declaration and each declarator introduces a new type name, not an object or a function. (since C++17) Specifiersĭeclaration specifiers ( decl-specifier-seq) is a sequence of the following whitespace-separated specifiers, in any order: init-declarator-list is optional when declaring a named class/struct/union or a named enumerationĪ structured binding declaration is also a simple declaration. block-declaration (a declaration that can appear inside a block), which, in turn, can be one of the following:Ī simple declaration is a statement that introduces, creates, and optionally initializes one or several identifiers, typically variables.ĭecl-specifier-seq init-declarator-list (optional) Īttr decl-specifier-seq init-declarator-list Ĭomma-separated list of declarators with optional initializers.It can only be used as part of a template declaration, explicit specialization, or explicit instantiation. This declaration must declare a constructor, destructor, or user-defined type conversion function. (since C++11) sequence of any number of attributes A function declaration without a decl-specifier-seq:.Template declaration (including Partial template specialization).Definitions are declarations that are sufficient to use the entity identified by the name. Not all declarations actually declare anything, and each kind of entity is declared differently. Declarations are how names are introduced (or re-introduced) into the C++ program. ![]()
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