_Atomic (when used as a type specifier) (since C11) A type name may introduce a new type: void* p = (void*)(struct X { int i; } *)0; // type name "struct X {int i;}*" used in the cast expression // introduces the new type "struct X" struct X x = {1}; // str...
Type specifiers in declarations define the type of a variable or function declaration. Syntax type-specifier: void char short int long float double signed unsigned struct-or-union-specifier enum-specifier typedef-name The signed char, signed int, signed...
Thedecltype(expression)specifier is a type specifier introduced in C++11. With this type specifier, you can get a type that is based on the resultant type of a possibly type-dependent expression. decltype(expression) takesexpressionas an operand. When you define a variable by using decltype(expr...
When an object is first created, the cv-qualifiers used (which could be part ofdecl-specifier-seqor part of adeclaratorin adeclaration, or part oftype-idin anew-expression) determine the constness or volatility of the object, as follows: ...
If both types are function types with parameter type lists, the type of each parameter in the composite parameter type list is the composite type of the corresponding parameters. These rules apply recursively to the types from which the two types are derived. ...
1) elaborated type specifier for a class type 2) elaborated type specifier for a enumeration type 3) A declaration that consists solely of an elaborated type specifier always declares a class type named by identifier in the scope that contains the declaration. ...
cpp // a.h class A; // 前向声明,A是一个incomplete type class B { public: void foo() { A::someMethod(); // 错误:incomplete type used in nested name specifier } }; 为了修正这个错误,我们需要确保A在使用其成员之前已经被完全定义。可以通过以下方式修正: cpp // a.h #ifndef A_H #de...
The above is accompanied by a note that is non-normative in nature. In accordance with 6.7.2 stated previously, when utilizing the actual type specifier asintor a typedef-name that has been defined asint, it is left to the implementation to decide if the bit-field should be signed or unsi...
Use the decltype type specifier, together with the auto keyword, to declare a template function whose return type depends on the types of its template arguments. For example, consider the following code example in which the return type of the template function depends on the types of the templa...
Elaborated type specifier From cppreference.com <cpp |language Elaborated type specifiers may be used to refer to a previously-declared class name (class, struct, or union) or to a previously-declared enum name even if the name washidden by a non-type declaration. They may also be used...