Operators

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Operators for the C++ Standard Template Library

#include <utility>

namespace rel_ops {
  template <class T>
  bool operator!=(const T&, const T&);

  template <class T>
  bool operator>(const T&, const T&);

  template <class T>
  bool operator<=(const T&, const T&);

  template <class T>
  bool operator>=(const T&, const T&);
}

The STL includes the following operators to avoid redundant definitions of operator!= out of operator==, and of operators >, <=, and >= out of operator<:

operator!=(x,y) returns !(x==y)

operator>(x,y) returns y>x

operator<=(x,y) returns !(y<x)

operator>=(x,y) returns !(x<y)

To avoid clashes with other global operators, these definitions are contained in the namespace rel_ops. To use them, either scope explicitly or include a using declaration, such as using namespace rel_ops.

ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 20.2