C++ Functional Library - negate

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Description

It is a negative function object class and the unary function object class whose call returns the result of negating its argument (as returned by the unary operator -).

Declaration

Following is the declaration for std::negate.

 template <class T> struct negate; 

C++11

 template <class T> struct negate; 

Parameters

T − It is a type of the arguments and return type of the functional call.

Return Value

none

Exceptions

noexcep − It doesn't throw any exceptions.

Example

In below example explains about std::negate.

 #include <iostream> #include <functional> #include <algorithm> int main () { int numbers[]={100,-200,300,-40,500,-300,200}; std::transform (numbers, numbers+5, numbers, std::negate<int>()); for (int i=0; i<4; i++) std::cout << numbers[i] << ' '; std::cout << '\n'; return 0; } 

Let us compile and run the above program, this will produce the following result −

 -100 200 -300 40