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operator==,!=,<,<=,>,>=,<=>(std::basic_string) - cppreference.com
Compare two basic_string objects
(1) (noexcept since C++11)
(constexpr since C++20) (2) (until C++20)
(noexcept since C++11) (3) (until C++20)
(noexcept since C++11) (4) (until C++20)
(noexcept since C++11) (5) (until C++20)
(noexcept since C++11) (6) (until C++20)
(noexcept since C++11) template< class CharT, class Traits, class Alloc >
constexpr /*comp-cat*/
operator<=>( const std::basic_string<CharT,Traits,Alloc>& lhs,
const std::basic_string<CharT,Traits,Alloc>& rhs ) noexcept; (7) (since C++20)
Compare a basic_string object and null-terminated array of T
template< class CharT, class Traits, class Alloc >
bool operator==( const std::basic_string<CharT,Traits,Alloc>& lhs,
const CharT* rhs ); (8) (constexpr since C++20) template< class CharT, class Traits, class Alloc >
bool operator==( const CharT* lhs,
const std::basic_string<CharT,Traits,Alloc>& rhs ); (9) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator!=( const std::basic_string<CharT,Traits,Alloc>& lhs,
const CharT* rhs ); (10) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator!=( const CharT* lhs,
const std::basic_string<CharT,Traits,Alloc>& rhs ); (11) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator<( const std::basic_string<CharT,Traits,Alloc>& lhs,
const CharT* rhs ); (12) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator<( const CharT* lhs,
const std::basic_string<CharT,Traits,Alloc>& rhs ); (13) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator<=( const std::basic_string<CharT,Traits,Alloc>& lhs,
const CharT* rhs ); (14) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator<=( const CharT* lhs,
const std::basic_string<CharT,Traits,Alloc>& rhs ); (15) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator>( const std::basic_string<CharT,Traits,Alloc>& lhs,
const CharT* rhs ); (16) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator>( const CharT* lhs,
const std::basic_string<CharT,Traits,Alloc>& rhs ); (17) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator>=( const std::basic_string<CharT,Traits,Alloc>& lhs,
const CharT* rhs ); (18) (until C++20) template< class CharT, class Traits, class Alloc >
bool operator>=( const CharT* lhs,
const std::basic_string<CharT,Traits,Alloc>& rhs ); (19) (until C++20) template< class CharT, class Traits, class Alloc >
constexpr /*comp-cat*/
operator<=>( const std::basic_string<CharT,Traits,Alloc>& lhs,
const CharT* rhs ); (20) (since C++20)
Compares the contents of a string with another string or a null-terminated array of CharT.
All comparisons are done via the compare() member function (which itself is defined in terms of Traits::compare()):
1-7) Compares two basic_string objects.
8-20) Compares a basic_string object and a null-terminated array of CharT.
1-6,8-19) true if the corresponding comparison holds, false otherwise.
7,20) static_cast</*comp-cat*/>(lhs.compare(rhs) <=> 0).
Linear in the size of the strings.
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
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