Standard C++ Library Reference ISO/IEC (VERSION3)

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<utility>
Include the STL standard header <utility> to define several templates of general use
throughout the Standard Template Library.
Four template operators -- operator!=, operator<=, operator>, and operator>= --
define a total ordering on pairs of operands of the same type, given definitions of
operator== and operator<.
If an implementation supports namespaces, these template operators are defined in the
rel_ops namespace, nested within the std namespace. If you wish to make use of these
template operators, write the declaration:
using namespace std::rel_ops;
which promotes the template operators into the current namespace.
namespace std {
template<class T, class Ty2>
struct pair;
// TEMPLATE FUNCTIONS
template<class Ty1, class Ty2>
pair<Ty, Ty2> make_pair(Ty1 val1, Ty2 val2);
template<class Ty1, class Ty2>
bool operator==(const pair<Ty, Ty2>& left,
const pair<Ty1, Ty2>& right);
template<class Ty1, class Ty2>
bool operator!=(const pair<Ty, Ty2>& left,
const pair<Ty1, Ty2>& right);
template<class Ty1, class Ty2>
bool operator<(const pair<Ty, Ty2>& left,
const pair<Ty1, Ty2>& right);
template<class Ty1, class Ty2>
bool operator>(const pair<Ty1, Ty2>& left,
const pair<Ty1, Ty2>& right);
template<class Ty1, class Ty2>
bool operator<=(const pair<Ty1, Ty2>& left,
const pair<Ty1, Ty2>& right);
template<class Ty1, class Ty2>
bool operator>=(const pair<Ty1, Ty2>& left,