20 Strings library [strings]

20.3 String classes [string.classes]

20.3.3 Non-member functions [string.nonmembers]

20.3.3.3 operator!= [string.op!=]

template<class charT, class traits, class Allocator> bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const basic_string<charT, traits, Allocator>& rhs) noexcept;
Returns: !(lhs == rhs).
template<class charT, class traits, class Allocator> bool operator!=(const charT* lhs, const basic_string<charT, traits, Allocator>& rhs);
Returns: rhs != lhs.
template<class charT, class traits, class Allocator> bool operator!=(const basic_string<charT, traits, Allocator>& lhs, const charT* rhs);
Requires: rhs points to an array of at least traits::length(rhs) + 1 elements of charT.
Returns: lhs.compare(rhs) != 0.