home | help 
std::stack::swap(3)	       C++ Standard Libary	     std::stack::swap(3)

NAME
     std::stack::swap - std::stack::swap

Synopsis
	void swap( stack& other ) noexcept(/* see below */);  (since C++11)

	Exchanges the contents of the container adaptor with those of other. Ef-
     fectively
	calls

      using std::swap;
      swap(c, other.c);

Parameters
	other - container adaptor to exchange the contents with

Return value
	(none)

Exceptions
	noexcept specification:
	noexcept(noexcept(swap(c,				      other.c)))
     (since C++11)
									       (un-
     til C++17)
	In the expression above, the identifier swap is looked up in the same
	manner as the one used by the C++17 std::is_nothrow_swappable trait.
	noexcept						  specification:
     (since C++17)
	noexcept(std::is_nothrow_swappable_v<Container>)

Complexity
	Same as underlying container (typically constant).

Notes
	Some  implementations  (e.g. libc++) provide the swap member function as
     an extension
	to pre-C++11 modes.

Example
     // Run this code

      #include <iostream>
      #include <concepts>
      #include <stack>
      #include <string>
      #include <string_view>
      #include <vector>

      template<typename Adaptor>
      requires (std::ranges::input_range<typename Adaptor::container_type>)
      void print(std::string_view name, const Adaptor& adaptor)
      {
	  struct Printer : Adaptor // to use protected Adaptor::Container c;
	  {
	      void print(std::string_view name) const
	      {
		  std::cout << name << " [" << std::size(this->c) << "]: ";
		  for (auto const& elem : this->c)
		      std::cout << elem << ' ';
		  std::cout << '\n';
	      }
	  };

	  static_cast<Printer const&>(adaptor).print(name);
      }

      int main()
      {
	  std::vector<std::string> v1{"1","_","3","4"},
				   v2{"a+/- ","B","AE","D","AE"};

	  std::stack s1(std::move(v1));
	  std::stack s2(std::move(v2));

	  print("s1", s1);
	  print("s2", s2);

	  s1.swap(s2);

	  print("s1", s1);
	  print("s2", s2);
      }

Output:
      s1 [4]: 4 3 2 1	    _
      s2 [5]: AE D AE B a+/-_
      s1 [5]: AE D AE B a+/-
      s2 [4]: 4 3 2 1

       Defect reports

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

	   DR	 Applied to	     Behavior as published	     Correct be-
     havior
	LWG  2456  C++11       the  noexcept specification is ill-formed made to
     work

See also
	std::swap(std::stack) specializes the std::swap algorithm
	(C++11) 	      (function template)

Category:
	  * conditionally noexcept

http://cppreference.com 	   2024.06.10		     std::stack::swap(3)
home | help