std::less

Template parameters

T

Type of the arguments to compare by the functional call.
The type shall support the operation (operator<).

Member types

Member functions

bool operator() (const T& x, const T& y)

Member function returning whether the first argument compares less than the second (x<y).

Example

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

foo includes bar.

See also

equal_to

Function object class for equality comparison (class template)

not_equal_to

Function object class for non-equality comparison (class template)

greater

Function object class for greater-than inequality comparison (class template)

greater_equal

Function object class for greater-than-or-equal-to comparison (class template)

less_equal

Function object class for less-than-or-equal-to comparison (class template)