std::swap(std::basic_string) - cppreference.com (original) (raw)

| Defined in header | | | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | ------------------------------------- | | 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) (constexpr since C++20) |

Specializes the std::swap algorithm for std::basic_string. Swaps the contents of lhs and rhs.

Equivalent to lhs.swap(rhs).

Contents

• 1 Parameters
• 2 Return value
• 3 Complexity
• 4 Exceptions
• 5 Example
• 6 Defect reports
• 7 See also

[edit] Parameters

[edit] Return value

(none)

[edit] Complexity

Constant.

[edit] Example

#include #include   int main() { std::string a = "AAA"; std::string b = "BBBB";   std::cout << "Before swap:\n" "a = " << a << "\n" "b = " << b << "\n\n";   std::swap(a, b);   std::cout << "After swap:\n" "a = " << a << "\n" "b = " << b << '\n'; }

Output:

Before swap: a = AAA b = BBBB   After swap: a = BBBB b = AAA

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

[edit] See also

| | swaps the contents (public member function) [edit] | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |