less_equal

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A binary function object that returns true if its first argument is less than or equal to its second

#include <functional>

namespace std {
  template <class T>
  struct less_equal;
}

less_equal is a binary function object. Its operator() returns true if x is less than or equal to y. You can pass a less_equal object to any algorithm that requires a binary function. For example, the sort() algorithm can accept a binary function as an alternate comparison object to sort a sequence. less_equal would be used in that algorithm in the following manner:

vector<int> vec1;
.
.
.
sort(vec1.begin(), vec1.end(),less_equal<int>());

After this call to sort(), vec1 is sorted in ascending order.

namespace std {

  template <class T>
  struct less_equal : binary_function<T, T, bool> {
    bool operator()(const T&, const T&) const;
  };
}

binary_function, Function Objects

ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.3.3