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

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

 

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

char_traits

 

std::basic_string

Member functions

basic_string::basic_string

basic_string::operator=

basic_string::assign

basic_string::get_allocator

Element access

basic_string::at

basic_string::operator[]

basic_string::front (C++11)

basic_string::back (C++11)

basic_string::data

basic_string::c_str

Iterators

basic_string::begin basic_string::cbegin (C++11)

basic_string::end basic_string::cend (C++11)

basic_string::rbegin basic_string::crbegin (C++11)

basic_string::rend basic_string::crend (C++11)

Capacity

basic_string::empty

basic_string::size

basic_string::length

basic_string::max_size

basic_string::reserve

basic_string::capacity

basic_string::shrink_to_fit (C++11)

Operations

basic_string::clear

basic_string::insert

basic_string::erase

basic_string::push_back

basic_string::pop_back (C++11)

basic_string::append

basic_string::operator+=

basic_string::compare

basic_string::replace

basic_string::substr

basic_string::copy

basic_string::resize

basic_string::swap

Search

basic_string::find

basic_string::rfind

basic_string::find_first_of

basic_string::find_first_not_of

basic_string::find_last_of

basic_string::find_last_not_of

Constants

basic_string::npos

Non-member functions

operator+

operator== operator!= operator< operator> operator<= operator>=

swap(std::basic_string)

operator<< operator>>

getline

stoi stol stoll (C++11) (C++11) (C++11)

stoul stoull (C++11) (C++11)

stof stod stold (C++11) (C++11) (C++11)

to_string (C++11)

to_wstring (C++11)

Helper classes

hash<std::string> hash<std::wstring> hash<std::u32string> hash<std::u16string> (C++11)

 

template< class T, class Alloc > bool operator==( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );	(1)
template< class T, class Alloc > bool operator!=( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );	(2)
template< class T, class Alloc > bool operator<( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );	(3)
template< class T, class Alloc > bool operator<=( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );	(4)
template< class T, class Alloc > bool operator>( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );	(5)
template< class T, class Alloc > bool operator>=( basic_string<T,Alloc>& lhs, basic_string<T,Alloc>& rhs );	(6)

Compares the contents of two strings.

1-2) Checks if the contents of lhs and rhs are equal, that is, lhs.size() == rhs.size() and each character in lhs has equivalent character in rhs at the same position.

3-6) Compares the contents of lhs and rhs lexicographically. The comparison is performed by a function equivalent to std::lexicographical_compare.

Parameters

lhs, rhs

-

strings whose contents to compare

Return value

1) true if the contents of the strings are equivalent, false otherwise

2) true if the contents of the strings are not equivalent, false otherwise

3) true if the contents of the lhs are lexicographically less than the contents of rhs, false otherwise

4) true if the contents of the lhs are lexicographically less than or equal the contents of rhs, false otherwise

5) true if the contents of the lhs are lexicographically greater than the contents of rhs, false otherwise

6) true if the contents of the lhs are lexicographically greater than or equal the contents of rhs, false otherwise

Complexity

Linear in the size of the strings.