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| Category: functors | | Component type: type |
Description
Unary_function is an empty base class: it contains no member functions or member variables, but only type information. The only reason it exists is to make it more convenient to define types that are models of the concept AdaptableUnaryFunction. Specifically, any model of AdaptableUnaryFunction must define nested typedefs. Those typedefs are provided by the base class unary_function.
Example
struct sine : public unary_function<double, double> {
double operator()(double x) { return sin(x); }
};
Definition
Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h.
Template parameters
| Parameter | Description | Default |
Arg | The function object's argument type | |
Result | The function object's result type | |
Model of
Assignable, DefaultConstructible
Type requirements
Public base classes
None.
Members
| Member | Where defined | Description |
argument_type | unary_function | See below. |
result_type | unary_function | See below. |
New members
These members are not defined in the Assignable and DefaultConstructible requirements, but are specific to unary_function.
| Member | Description |
argument_type | The function object's argument type. This is a typedef for the template parameter Arg. |
result_type | The function object's result type. This is a typedef for the template parameter Result. |
Notes
See also
The functors overview, AdaptableUnaryFunction, binary_function
