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swap Function (unordered_multimap)

Swaps the contents of two containers.

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

Parameters

  • Key
    The key type.

  • Ty
    The mapped 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_multimap::swap(right).

Example

 

// std_tr1__unordered_map__u_mm_swap.cpp 
// compile with: /EHsc 
#include <unordered_map> 
#include <iostream> 
 
typedef std::unordered_multimap<char, int> Mymap; 
int main() 
    { 
    Mymap c1; 
 
    c1.insert(Mymap::value_type('a', 1)); 
    c1.insert(Mymap::value_type('b', 2)); 
    c1.insert(Mymap::value_type('c', 3)); 
 
// display contents " [c 3] [b 2] [a 1]" 
    for (Mymap::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << it->first << ", " << it->second << "]"; 
    std::cout << std::endl; 
 
    Mymap c2; 
 
    c2.insert(Mymap::value_type('d', 4)); 
    c2.insert(Mymap::value_type('e', 5)); 
    c2.insert(Mymap::value_type('f', 6)); 
 
    c1.swap(c2); 
 
// display contents " [f 6] [e 5] [d 4]" 
    for (Mymap::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << it->first << ", " << it->second << "]"; 
    std::cout << std::endl; 
 
    swap(c1, c2); 
 
// display contents " [c 3] [b 2] [a 1]" 
    for (Mymap::const_iterator it = c1.begin(); 
        it != c1.end(); ++it) 
        std::cout << " [" << it->first << ", " << it->second << "]"; 
    std::cout << std::endl; 
 
    return (0); 
    } 
 
 [c, 3] [b, 2] [a, 1]
 [f, 6] [e, 5] [d, 4]
 [c, 3] [b, 2] [a, 1]

Requirements

Header: <unordered_map>

Namespace: std

See Also

Reference

<unordered_map>

unordered_multimap::swap

Other Resources

<unordered_map> Members