Книга: Standard Template Library Programmer

plus

plus<T>

Category: functors

Component type: type

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

Each element in V3 will be the sum 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(), plus<double>());

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

Adaptable Binary Function, Default Constructible

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.

binary_function<T, T, T>

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

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

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