C++ Functional Library - less


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Description

It is a function object class for less-than inequality comparison and binary function object class whose call returns whether the its first argument compares less than the second (as returned by operator <).

Declaration

Following is the declaration for std::less.

template <class T> struct less;

C++11

template <class T> struct less;

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::greater_equal.

#include <iostream>
#include <functional>
#include <algorithm>

int main () {
   int foo[]={10,20,5,15,25};
   int bar[]={15,10,20};
   std::sort (foo, foo+5, std::less<int>());
   std::sort (bar, bar+3, std::less<int>());
   if (std::includes (foo, foo+5, bar, bar+3, std::less<int>()))
      std::cout << "foo included.\n";
   return 0;
}

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

foo included. 
functional.htm
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