Standard Template Library Programmer's Guide

• less_equal

• logical_and

• logical_or

• logical_not

• subtractive_rng

• identity

• project1st

• project2nd

• select1st

• select2nd

• unary_function

• binary_function

• unary_compose

• binary_compose

• unary_negate

• binary_negate

• binder1st

• binder2nd

• pointer_to_unary_function

• pointer_to_binary_function

• compose1

• compose2

• not1

• not2

• bind1st

• bind2nd

• ptr_fun

[1] The reason for the name "adaptable function object" is that adaptable function objects may be used by function object adaptors.

[2] The unary_function and binary_function bases are similar to the input_iterator , output_iterator , forward_iterator , bidirectional_iterator , and random_access_iterator bases: they are completely empty, and serve only to provide type information.

[3] This is an example of how to use function objects; it is not the recommended way of calculating the sum of elements in a vector. The accumulate algorithm is a better way of calculating a sum.

Category: functors

Component type: concept

A Generator is a kind of function object: an object that is called as if it were an ordinary C++ function. A Generator is called with no arguments.

Assignable

FA type that is a model of Generator

ResultThe result type of F

fObject of type F

The range of a Generator is the set of all possible value that it may return.

• Result (*)()

[1] Two different invocations of f may return different results: a Generator may refer to local state, perform I/O, and so on. The expression f() is permitted to change f 's state; f might, for example, represent a pseudo-random number generator.

Function Object overview, Unary Function, Binary Function, Adaptable Generator

Category: functors

Component type: concept

A Unary Function is a kind of function object: an object that is called as if it were an ordinary C++ function. A Unary Function is called with a single argument.

Assignable

FA type that is a model of Unary Function

XThe argument type of F

ResultThe result type of F

fObject of type F

xObject of type X

The domain of a Unary Function is the set of all permissible values for its argument.

The range of a Unary Function is the set of all possible values that it may return.

• Result (*)(X)

[1] Two different invocations of f may return different results, even if f is called with the same arguments both times. A Unary Function may refer to local state, perform I/O, and so on. The expression f(x) is permitted to change f 's state.

Function Object overview, Generator, Binary Function Adaptable Unary Function

Category: functors

Component type: concept

A Binary Function is a kind of function object: an object that is called as if it were an ordinary C++ function. A Binary Function is called with two arguments.

Assignable

FA type that is a model of BinaryFunction

XThe first argument type of F

YThe second argument type of F

ResultThe result type of F

fObject of type F

xObject of type X

yObject of type Y

The domain of a Binary Function is the set of all ordered pairs (x, y) that are permissible values for its arguments.

The range of a Binary Function is the set of all possible value that it may return.

• Result (*)(X,Y)