identity Structure
The latest version of this topic can be found at identity Structure.
A struct that provides a type definition as the template parameter.
Syntax
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