Книга: Standard Template Library Programmer
negate
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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 |
|---|---|
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.
See also
The Function Object overview, Adaptable Unary Function, unary_function, plus, minus, multiplies, divides, modulus
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