operators (std::basic_string)
Compare two basic_string objects | | |
|---|---|---|
template< class CharT, class Traits, class Alloc > bool operator==( const basic_string<CharT,Traits,Alloc>& lhs, const basic_string<CharT,Traits,Alloc>& rhs ); | (1) | |
template< class CharT, class Traits, class Alloc > bool operator!=( const basic_string<CharT,Traits,Alloc>& lhs, const basic_string<CharT,Traits,Alloc>& rhs ); | (2) | |
template< class CharT, class Traits, class Alloc > bool operator<( const basic_string<CharT,Traits,Alloc>& lhs, const basic_string<CharT,Traits,Alloc>& rhs ); | (3) | |
template< class CharT, class Traits, class Alloc > bool operator<=( const basic_string<CharT,Traits,Alloc>& lhs, const basic_string<CharT,Traits,Alloc>& rhs ); | (4) | |
template< class CharT, class Traits, class Alloc > bool operator>( const basic_string<CharT,Traits,Alloc>& lhs, const basic_string<CharT,Traits,Alloc>& rhs ); | (5) | |
template< class CharT, class Traits, class Alloc > bool operator>=( const basic_string<CharT,Traits,Alloc>& lhs, const basic_string<CharT,Traits,Alloc>& rhs ); | (6) | |
Compare a basic_string object and null-terminated array of T | | |
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) | |
将字符串的内容与另一个字符串或以空结尾的CharT...
所有比较都是通过compare()成员函数%28，它本身是根据Traits::compare()29%：
- 如果两个字符串的大小都相同，则两个字符串是相等的。
lhs和rhs中的每个字符都是相等的。lhs中具有等效字符的rhs在同一位置。
- 排序比较是按字典顺序进行的--通过一个等价于
std::lexicographical_compare...
1-6%29比较两basic_string物品。
7-12%29比较abasic_string对象的空结束数组。CharT...
参数
lhs, rhs | - | strings whose contents to compare |
|---|
返回值
true如果相应的比较成立，false否则。
例外
1-6%29
(none) | (until C++14) |
|---|---|
noexcept specification: noexcept | (since C++14) |
7-12%29%280%29
复杂性
在字符串的大小上是线性的。
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