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swap (C++ STL <string>)

  • 项目

Exchanges the arrays of characters of two strings.

template<class Traits, class Allocator> 
   void swap( 
      basic_string<CharType, Traits, Allocator>& _Left, 
      basic_string<CharType, Traits, Allocator>& _Right 
   );

Parameters

  • _Left
    One string whose elements are to be swapped with those of another string.

  • _Right
    The other string whose elements are to be swapped with the first string.

Remarks

The template function executes the specialized member function _Left.swap(_Right) for strings, which guarantees constant complexity.

Example

// string_swap.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( ) 
{
   using namespace std;
   // Declaring an object of type basic_string<char>
   string s1 ( "Tweedledee" );
   string s2 ( "Tweedledum" );
   cout << "Before swapping string s1 and s2:" << endl;
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   swap ( s1 , s2 );
   cout << "\nAfter swapping string s1 and s2:" << endl;
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;
}

Before swapping string s1 and s2:
The basic_string s1 = Tweedledee.
The basic_string s2 = Tweedledum.

After swapping string s1 and s2:
The basic_string s1 = Tweedledum.
The basic_string s2 = Tweedledee.

Requirements

Header: <string>

Namespace: std