operator==,!=,<,<=,>,>=,<=>(std::basic_string)

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<string>

2 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++14)

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++14) (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++14)

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++14) (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++14)

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++14) (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++14)

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++14) (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++14)

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++14) (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++14)

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++14) (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 NULL

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

• lhs rhs lhs rhs 2

• std::lexicographical_compare std::lexicographical_compare_three_way (C++20)

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

(C++20)

lhs, rhs

-

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

(C++20)