std::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 CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( const basic_string<CharT,Traits,Alloc>& lhs,                    const basic_string<CharT,Traits,Alloc>& rhs );	(1)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( const CharT* lhs,                    const basic_string<CharT,Traits,Alloc>& rhs );	(2)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( CharT lhs,                    const basic_string<CharT,Traits,Alloc>& rhs );	(3)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( const basic_string<CharT,Traits,Alloc>& lhs,                    const CharT* rhs );	(4)
template<class CharT, class Traits, class Alloc>     basic_string<CharT,Traits,Alloc>         operator+( const basic_string<CharT,Traits,Alloc>& lhs,                    CharT rhs );	(5)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( basic_string<CharT,Traits,Alloc>&& lhs,                    const basic_string<CharT,Traits,Alloc>& rhs );	(6)	(since C++11)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( const basic_string<CharT,Traits,Alloc>& lhs,                    basic_string<CharT,Traits,Alloc>&& rhs );	(7)	(since C++11)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( basic_string<CharT,Traits,Alloc>&& lhs,                    basic_string<CharT,Traits,Alloc>&& rhs );	(8)	(since C++11)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+(const CharT* lhs,                   basic_string<CharT,Traits,Alloc>&& rhs );	(9)	(since C++11)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( CharT lhs,                    basic_string<CharT,Traits,Alloc>&& rhs );	(10)	(since C++11)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( basic_string<CharT,Traits,Alloc>&& lhs,                    const CharT* rhs );	(11)	(since C++11)
template< class CharT, class Traits, class Alloc >     basic_string<CharT,Traits,Alloc>         operator+( basic_string<CharT,Traits,Alloc>&& lhs,                    CharT rhs );	(12)	(since C++11)

Returns a string containing characters from lhs followed by the characters from rhs.

Parameters

lhs	-	string, character, or pointer to the first character in a null-terminated array
rhs	-	string, character, or pointer to the first character in a null-terminated array

Return value

1) basic_string<CharT,Traits,Alloc>(lhs).append(rhs)

2) basic_string<CharT,Traits,Alloc>(lhs) + rhs

3) basic_string<CharT,Traits,Alloc>(1,lhs) + rhs

4) lhs + basic_string<CharT,Traits,Alloc>(rhs)

5) lhs + basic_string<CharT,Traits,Alloc>(1,rhs)

6) std::move(lhs.append(rhs))

7) std::move(rhs.insert(0, lhs))

8) std::move(lhs.append(rhs)) or std::move(rhs.insert(0, lhs))

9) std::move(rhs.insert(0, lhs))

10) std::move(rhs.insert(0, 1, lhs))

11) std::move(lhs.append(rhs))

12) std::move(lhs.append(1, rhs))

Example

run this code

#include <iostream>
#include <string>
 
int main()
{
    std::string s1 = "Hello";
    std::string s2 = "world";
    std::cout << s1 + ' ' + s2 + "!\n";
}

Output:

Hello world!

See also

operator+=	appends characters to the end (public member function)
append	appends characters to the end (public member function)
insert	inserts characters (public member function)