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Standard Template Library Programmer's Guide
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negate<T>


Category: functors	Component type: type

Description

Negate<T> is a function object. Specifically, it is an Adaptable Unary Function. If f is an object of class negate<T> and x is an object of class T, then f(x) returns -x.

Example

Each element in V2 will be the negative (additive inverse) of the corresponding element in V1.

const int N = 1000;
vector<double> V1(N);
vector<double> V2(N);

iota(V1.begin(), V1.end(), 1);

assert(V2.size() >= V1.size());
transform(V1.begin(), V1.end(), V2.begin(),
          negate<int>());

Definition

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

Template parameters

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

Model of

Adaptable Unary Function, Default Constructible

Type requirements

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

Public base classes

unary_function<T, T>

Members

Member	Where defined	Description
`argument_type`	Adaptable Unary Function	The type of the second argument: `T`
`result_type`	Adaptable Unary Function	The type of the result: `T`
`T operator()(const T& x)`	Adaptable Unary Function	Function call operator. The return value is `-x`.
`negate()`	Default Constructible	The default constructor.

New members

All of negate's members are defined in the Adaptable Unary Function and Default Constructible requirements. Negate does not introduce any new members.