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

operator!=
template<class Key, class Ty, class Pr, class Alloc>
bool operator!=(
const map <Key, Ty, Pr, Alloc>& left,
const map <Key, Ty, Pr, Alloc>& right);
template<class Key, class Ty, class Pr, class Alloc>
bool operator!=(
const multimap <Key, Ty, Pr, Alloc>& left,
const multimap <Key, Ty, Pr, Alloc>& right);
The template function returns !(left == right).
operator==
template<class Key, class Ty, class Pr, class Alloc>
bool operator==(
const map <Key, Ty, Pr, Alloc>& left,
const map <Key, Ty, Pr, Alloc>& right);
template<class Key, class Ty, class Pr, class Alloc>
bool operator==(
const multimap <Key, Ty, Pr, Alloc>& left,
const multimap <Key, Ty, Pr, Alloc>& right);
The first template function overloads operator== to compare two objects of template class
map. The second template function overloads operator== to compare two objects of
template class multimap. Both functions return left.size() == right.size() &&
equal(left. begin(), left. end(), right.begin()).
operator<
template<class Key, class Ty, class Pr, class Alloc>
bool operator<(
const map <Key, Ty, Pr, Alloc>& left,
const map <Key, Ty, Pr, Alloc>& right);
template<class Key, class Ty, class Pr, class Alloc>
bool operator<(
const multimap <Key, Ty, Pr, Alloc>& left,
const multimap <Key, Ty, Pr, Alloc>& right);
The first template function overloads operator< to compare two objects of template class
map. The second template function overloads operator< to compare two objects of template
class multimap. Both functions return lexicographical_compare(left.