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std::swap(std::basic_string) 

template< class CharT, class Traits, class Alloc >
void swap( std::basic_string<CharT, Traits, Alloc> &lhs,
           std::basic_string<CharT, Traits, Alloc> &rhs );
 (until C++17) 
template< class CharT, class Traits, class Alloc >
void swap( std::basic_string<CharT, Traits, Alloc> &lhs,
           std::basic_string<CharT, Traits, Alloc> &rhs ) noexcept(/* see below */);
 (since C++17)

Specializes the std::swap algorithm for std::basic_string. Swaps the contents of lhs and rhs. Equivalent to lhs.swap(rhs).

Parameters

lhs, rhs - strings whose contents to swap

Return value

(none).

Complexity

Constant.

Exceptions

noexcept specification:
noexcept(noexcept(lhs.swap(rhs)))
 (since C++17)

See also

swaps the contents
(public member function)

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