std::operator+(std::basic_string)

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

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)

Filesystem library (C++17)

Technical Specifications

Strings library

Null-terminated strings

Byte strings

Multibyte strings

Wide strings

Classes

basic_string

basic_string_view (C++17)

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 basic_string::operator basic_string_view (C++17) Iterators basic_string::beginbasic_string::cbegin (C++11) basic_string::endbasic_string::cend (C++11) basic_string::rbeginbasic_string::crbegin (C++11) basic_string::rendbasic_string::crend (C++11) Capacity basic_string::empty basic_string::sizebasic_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::starts_with (C++20) basic_string::ends_with (C++20) 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 stoistolstoll (C++11)(C++11)(C++11) stoulstoull (C++11)(C++11) stofstodstold (C++11)(C++11)(C++11) to_string (C++11) to_wstring (C++11) operator""s (C++14) Helper classes hash<std::string>hash<std::wstring>hash<std::u32string>hash<std::u16string> (C++11)(C++11)(C++11)(C++11) hash<std::pmr::string>hash<std::pmr::wstring>hash<std::pmr::u32string>hash<std::pmr::u16string> (C++20)(C++20)(C++20)(C++20) Deduction guides(C++17)

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)