Standard Template Library Programmer's Guide

The function object's argument type and result type.

Model of

Adaptable Binary Function, Default Constructible

Type requirements

T must be a numeric type; if x and y are objects of type T, then x+y must be defined and must have a return type that is convertible to T. T must be Assignable.

Public base classes

binary_function<T, T, T>

Members

Member	Where defined	Description
first_argument_type	Adaptable Binary Function	The type of the first argument: T
second_argument_type	Adaptable Binary Function	The type of the second argument: T
result_type	Adaptable Binary Function	The type of the result: T
T operator()(const T& x, const T& y)	Adaptable Binary Function	Function call operator. The return value is x + y.
plus()	Default Constructible	The default constructor.

New members

All of plus's members are defined in the Adaptable Binary Function and Default Constructible requirements. Plus does not introduce any new members.

Notes

See also

The Function Object overview, Adaptable Binary Function, binary_function, minus, multiplies, divides, modulus, negate

minus<T>

Category: functors

Component type: type

Description

Minus<T> is a function object. Specifically, it is an Adaptable Binary Function. If f is an object of class minus<T> and x and y are objects of class T, then f(x,y) returns x-y.

Example

Each element in V3 will be the difference of the corresponding elements in V1 and V2

const int N = 1000;
vector<double> V1(N);
vector<double> V2(N);
vector<double> V3(N);
iota(V1.begin(), V1.end(), 1);
fill(V2.begin(), V2.end(), 75);
assert(V2.size() >= V1.size() && V3.size() >= V1.size());
transform(V1.begin(), V1.end(), V2.begin(), V3.begin(), minus<double>());

Definition

Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h.

Template parameters

Parameter	Description
T	The function object's argument type and result type.

Model of

Adaptable Binary Function, Default Constructible

Type requirements

T must be a numeric type; if x and y are objects of type T, then x-y must be defined and must have a return type that is convertible to T. T must be Assignable.

Public base classes

binary_function<T, T, T>