Книга: Standard Template Library Programmer

Adaptable Binary Function

Adaptable Binary Function

Category: functors

Component type: concept


An Adaptable Binary Function is a Binary Function with nested typedefs that define its argument types and result type. [1] [2] These nested typedefs make it possible to use function object adaptors.

Refinement of

Binary Function

Associated types

First argument type F::first_argument_type The type of F's first argument
Second argument type F::second_argument_type The type of F's second argument
Result type F::result_type The type returned when the Binary Function is called


F A type that is a model of Binary Function

Valid expressions

None, except for those defined by Binary Function


• plus
• project1st
• pointer_to_binary_function


[1] Note the implication of this: a function pointer T (*f)(X,Y) is a Binary Function, but not an Adaptable Binary Function: the expressions f::first_argument_type, f::second_argument_type, and f::result_type are nonsensical.

[2] When you define a class that is a model of Adaptable Binary Function, you must provide these typedefs. The easiest way to do this is to derive the class from the base class binary_function. This is an empty class, with no member functions or member variables; the only reason it exists is to make defining Adaptable Binary Functions more convenient. Binary_function is very similar to the base classes used by the iterator tag functions.

See also

Binary Function, Adaptable Generator, Adaptable Unary Function

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