identity Structure
A struct that provides a type definition as the template parameter.
template<class Type>
struct identity {
typedef Type type;
Type operator()(const Type& _Left) const;
};
Parameters
Parameter |
Description |
|---|---|
_Left |
The value to identify. |
Remarks
The class contains the public type definition type, which is the same as the template parameter Type. It is used in conjunction with template function forward to ensure that a function parameter has the desired type.
For compatibility with older code, the class also defines the identity function operator() which returns its argument _Left.
Requirements
Header: <utility>
Namespace: std