C++ String Library - swap

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Description

It exchanges the content of the container by the content of str, which is another string object. Lengths may differ.

Declaration

Following is the declaration for std::string::swap.

void swap (string& str);

C++11

void swap (string& str);

C++14

void swap (string& str);

Parameters

str − It is a string object.

Return Value

none

Exceptions

if an exception is thrown, there are no changes in the string.

Example

In below example for std::string::swap.

#include <iostream>
#include <string>

main () {
   std::string buyer ("money");
   std::string seller ("goods");

   std::cout << "Before the swap, buyer has " << buyer;
   std::cout << " and seller has " << seller << '\n';

   seller.swap (buyer);

   std::cout << " After the swap, buyer has " << buyer;
   std::cout << " and seller has " << seller << '\n';

   return 0;
}

The sample output should be like this −

Before the swap, buyer has money and seller has goods
 After the swap, buyer has goods and seller has money