operator==,!=,<,<=,>,>=(std::basic_string)
From cppreference.com
< cpp | string | basic string
| Compare two basic_string objects |
||
| template< class CharT, class Traits, class Alloc > bool operator==( const basic_string<CharT,Traits,Alloc>& lhs, |
(1) | |
| template< class CharT, class Traits, class Alloc > bool operator!=( const basic_string<CharT,Traits,Alloc>& lhs, |
(2) | |
| template< class CharT, class Traits, class Alloc > bool operator<( const basic_string<CharT,Traits,Alloc>& lhs, |
(3) | |
| template< class CharT, class Traits, class Alloc > bool operator<=( const basic_string<CharT,Traits,Alloc>& lhs, |
(4) | |
| template< class CharT, class Traits, class Alloc > bool operator>( const basic_string<CharT,Traits,Alloc>& lhs, |
(5) | |
| template< class CharT, class Traits, class Alloc > bool operator>=( const basic_string<CharT,Traits,Alloc>& lhs, |
(6) | |
| Compare a basic_string object and null-terminated array of T |
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| template< class CharT, class Traits, class Alloc > bool operator==( const CharT* lhs, const basic_string<CharT,Traits,Alloc>& rhs ); |
(7) | |
| template< class CharT, class Traits, class Alloc > bool operator==( const basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs ); |
(7) | |
| template< class CharT, class Traits, class Alloc > bool operator!=( const CharT* lhs, const basic_string<CharT,Traits,Alloc>& rhs ); |
(8) | |
| template< class CharT, class Traits, class Alloc > bool operator!=( const basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs ); |
(8) | |
| template< class CharT, class Traits, class Alloc > bool operator<( const CharT* lhs, const basic_string<CharT,Traits,Alloc>& rhs ); |
(9) | |
| template< class CharT, class Traits, class Alloc > bool operator<( const basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs ); |
(9) | |
| template< class CharT, class Traits, class Alloc > bool operator<=( const CharT* lhs, const basic_string<CharT,Traits,Alloc>& rhs ); |
(10) | |
| template< class CharT, class Traits, class Alloc > bool operator<=( const basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs ); |
(10) | |
| template< class CharT, class Traits, class Alloc > bool operator>( const CharT* lhs, const basic_string<CharT,Traits,Alloc>& rhs ); |
(11) | |
| template< class CharT, class Traits, class Alloc > bool operator>( const basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs ); |
(11) | |
| template< class CharT, class Traits, class Alloc > bool operator>=( const CharT* lhs, const basic_string<CharT,Traits,Alloc>& rhs ); |
(12) | |
| template< class CharT, class Traits, class Alloc > bool operator>=( const basic_string<CharT,Traits,Alloc>& lhs, const CharT* rhs ); |
(12) | |
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()):
- Two strings are equal if both the size of
lhsandrhsare equal and each character inlhshas equivalent character inrhsat the same position.
- The ordering comparisons are done lexicographically -- the comparison is performed by a function equivalent to std::lexicographical_compare.
1-6) Compares two
basic_string objects.7-12) Compares a
basic_string object and a null-terminated array of CharT.Contents |
[edit] Parameters
| lhs, rhs | - | strings whose contents to compare |
[edit] Return value
true if the corresponding comparison holds, false otherwise.
[edit] Exceptions
1-6)
| (none) | (until C++14) |
| noexcept specification: noexcept |
(since C++14) |
7-12) (none)
[edit] Complexity
Linear in the size of the strings.