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

From cppreference.com
 
 
 
 
Defined in header <string_view>
template< class CharT, class Traits >

constexpr bool operator==( basic_string_view <CharT,Traits> lhs,

                           basic_string_view <CharT,Traits> rhs );
(1) (since C++17)
template< class CharT, class Traits >

constexpr bool operator!=( basic_string_view <CharT,Traits> lhs,

                           basic_string_view <CharT,Traits> rhs );
(2) (since C++17)
template< class CharT, class Traits >

constexpr bool operator<( basic_string_view <CharT,Traits> lhs,

                          basic_string_view <CharT,Traits> rhs );
(3) (since C++17)
template< class CharT, class Traits >

constexpr bool operator<=( basic_string_view <CharT,Traits> lhs,

                           basic_string_view <CharT,Traits> rhs );
(4) (since C++17)
template< class CharT, class Traits >

constexpr bool operator>( basic_string_view <CharT,Traits> lhs,

                          basic_string_view <CharT,Traits> rhs );
(5) (since C++17)
template< class CharT, class Traits >

constexpr bool operator>=( basic_string_view <CharT,Traits> lhs,

                           basic_string_view <CharT,Traits> rhs );
(6) (since C++17)

Compares two views.

All comparisons are done via the compare() member function (which itself is defined in terms of Traits::compare()):

  • Two views are equal if both the size of lhs and rhs are equal and each character in lhs has an equivalent character in rhs at the same position.
  • The ordering comparisons are done lexicographically -- the comparison is performed by a function equivalent to std::lexicographical_compare.

The implementation shall provide sufficient additional constexpr and noexcept overloads of these functions so that a basic_string_view<CharT,Traits> object sv may be compared to another object t with an implicit conversion to basic_string_view<CharT,Traits>, with semantics identical to comparing sv and basic_string_view<CharT,Traits>(t).

Contents

[edit] Parameters

lhs, rhs - views to compare

[edit] Return value

true if the corresponding comparison holds, false otherwise.

[edit] Exceptions

noexcept specification:  
noexcept
  

[edit] Complexity

Linear in the size of the views.