swap Function (unordered_set)

Swaps the contents of two containers.

template<class Key, class Hash, class Pred, class Alloc>
    void swap(
        unordered_set <Key, Hash, Pred, Alloc>& left,
        unordered_set <Key, Hash, Pred, Alloc>& right);

Parameters

• Key
  The key type.

• Hash
  The hash function object type.

• Pred
  The equality comparison function object type.

• Alloc
  The allocator class.

• left
  The first container to swap.

• right
  The second container to swap.

Remarks

The template function executes left.unordered_set::swap(right).

Example

// std_tr1__unordered_set__u_s_swap.cpp 
// compile with: /EHsc 
#include <unordered_set> 
#include <iostream> 
 
typedef std::unordered_set<char> Myset; 
int main() 
    { 
    Myset c1; 
 
    c1.insert('a'); 
    c1.insert('b'); 
    c1.insert('c'); 
 
// display contents " [c] [b] [a]" 
    for (Myset::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << *it << "]"; 
    std::cout << std::endl; 
 
    Myset c2; 
 
    c2.insert('d'); 
    c2.insert('e'); 
    c2.insert('f'); 
 
    c1.swap(c2); 
 
// display contents " [f] [e] [d]" 
    for (Myset::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << *it << "]"; 
    std::cout << std::endl; 
 
    swap(c1, c2); 
 
// display contents " [c] [b] [a]" 
    for (Myset::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << *it << "]"; 
    std::cout << std::endl; 
 
    return (0); 
    } 
 

 [c] [b] [a]
 [f] [e] [d]
 [c] [b] [a]

Requirements

Header: <unordered_set>

Namespace: std

See Also

Reference

<unordered_set>

unordered_set::swap

Other Resources

<unordered_set> Members