binary_function<Arg1, Arg2, Result>
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| Category: functors |
Component type: type |
Description
Binary_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 Adaptable Binary Function.
Specifically, any model of Adaptable Binary Function must define
nested typedefs. Those typedefs are provided by the base
class binary_function.
Example
struct exponentiate : public binary_function<double, double, double> {
double operator()(double x, double y) { return pow(x, y); }
};
Definition
Defined in the standard header functional, and in the nonstandard
backward-compatibility header function.h.
Template parameters
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Parameter
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Description
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Default
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Arg1
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The function object's first argument type
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Arg2
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The function object's second argument type
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Result
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The function object's result type
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Model of
Assignable, Default Constructible
Type requirements
Public base classes
None.
Members
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Member
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Where defined
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Description
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first_argument_type
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unary_function
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See below.
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second_argument_type
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unary_function
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See below.
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result_type
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unary_function
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See below.
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New members
These members are not defined in the
Assignable and Default Constructible
requirements, but are specific to
unary_function.
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Member
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Description
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first_argument_type
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The function object's first argument type. This is a typedef for the
template parameter Arg1.
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second_argument_type
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The function object's second argument type. This is a typedef for the
template parameter Arg2.
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result_type
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The function object's result type. This is a typedef for the
template parameter Result.
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Notes
See also
The Function Object overview, Adaptable Binary Function,
unary_function
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