Test for lexicographical equality.
template <class charT, class traits, class Allocator> bool operator== (const basic_string<charT,traits,Allocator>& lhs, const basic_string<charT,traits,Allocator>& rhs); template<class charT, class traits, class Allocator> bool operator== (const charT* lhs,const basic_string <charT,traits,Allocator>& rhs); template<class charT, class traits, class Allocator> bool operator== (const basic_string<charT,traits,Allocator>& lhs, const charT* rhs);
True if the strings match otherwise false.