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operator==,!=,<,<=,>,>=,<=>(std::basic_string) cppreference.com
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operator==,!=,<,<=,>,>=,<=>(std::basic_string)

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basic_string
(1)
template< class CharT, class Traits, class Alloc > bool operator==( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++11)
template< class CharT, class Traits, class Alloc > bool operator==( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs ) noexcept;
 ( C++11)
( C++20)
template< class CharT, class Traits, class Alloc > constexpr bool operator==( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs ) noexcept;
 ( C++20)
(2)
template< class CharT, class Traits, class Alloc > bool operator!=( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++11)
template< class CharT, class Traits, class Alloc > bool operator!=( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs ) noexcept;
 ( C++11)
( C++20)
(3)
template< class CharT, class Traits, class Alloc > bool operator<( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++11)
template< class CharT, class Traits, class Alloc > bool operator<( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs ) noexcept;
 ( C++11)
( C++20)
(4)
template< class CharT, class Traits, class Alloc > bool operator<=( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++11)
template< class CharT, class Traits, class Alloc > bool operator<=( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs ) noexcept;
 ( C++11)
( C++20)
(5)
template< class CharT, class Traits, class Alloc > bool operator>( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++11)
template< class CharT, class Traits, class Alloc > bool operator>( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs ) noexcept;
 ( C++11)
( C++20)
(6)
template< class CharT, class Traits, class Alloc > bool operator>=( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++11)
template< class CharT, class Traits, class Alloc > bool operator>=( const std::basic_string<CharT,Traits,Alloc>& lhs, const std::basic_string<CharT,Traits,Alloc>& rhs ) noexcept;
 ( C++11)
( C++20)
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) ( C++20)
basic_string T,
(8)
template< class CharT, class Traits, class Alloc > bool operator==( const std::basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs );
 ( C++20)
template< class CharT, class Traits, class Alloc > constexpr bool operator==( const std::basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs );
 ( C++20)
template< class CharT, class Traits, class Alloc > bool operator==( const CharT* lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++20)
(9)
template< class CharT, class Traits, class Alloc > bool operator!=( const std::basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs );
 ( C++20)
template< class CharT, class Traits, class Alloc > bool operator!=( const CharT* lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++20)
(10)
template< class CharT, class Traits, class Alloc > bool operator<( const std::basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs );
 ( C++20)
template< class CharT, class Traits, class Alloc > bool operator<( const CharT* lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++20)
(11)
template< class CharT, class Traits, class Alloc > bool operator<=( const std::basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs );
 ( C++20)
template< class CharT, class Traits, class Alloc > bool operator<=( const CharT* lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++20)
(12)
template< class CharT, class Traits, class Alloc > bool operator>( const std::basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs );
 ( C++20)
template< class CharT, class Traits, class Alloc > bool operator>( const CharT* lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++20)
(13)
template< class CharT, class Traits, class Alloc > bool operator>=( const std::basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs );
 ( C++20)
template< class CharT, class Traits, class Alloc > bool operator>=( const CharT* lhs, const std::basic_string<CharT,Traits,Alloc>& rhs );
 ( C++20)
template< class CharT, class Traits, class Alloc > constexpr /*comp-cat*/ operator<=>( const std::basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs );
 (14) ( C++20)

CharT, .

- compare() ( Traits::compare()):

  • , lhs rhs lhs rhs .
1-7) basic_string.
8-14) basic_string CharT, .

(/*comp-cat*/) Traits::comparison_category, , std::weak_ordering. /*comp-cat*/ , .

<, <=, >, >= != operator<=> operator== .

( C++20)

lhs, rhs ,

1-6,8-13) true, , false .
7,14) static_cast</*comp-cat*/>(lhs.compare(rhs) <=> 0).

.

std::string, std::wstring, std::u8string, std::u16string std::u32string, operator<=> std::strong_ordering.

( C++20)


:

C++:

LWG 2064 C++11 , ,
basic_string, noexcept, ; ,
CharT*, noexcept,
; noexcept
LWG 3432 C++20 operator<=>
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