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C++ Unordered_multimap Library - swap() Function
Description
The C++ function std::unordered_multimap::swap() exchanges the content of first unordered_multimap with another.
Declaration
Following is the declaration for std::unordered_multimap::swap() function form std::unordered_map() header.
C++11
void swap(unordered_multimap& umm);
Parameters
umm − Another unordered_multimap object.
Return value
None
Time complexity
Constant i.e. O(1)
Example
The following example shows the usage of std::unordered_multimap::swap() function.
#include <iostream> #include <unordered_map> using namespace std; int main(void) { unordered_multimap<char, int> umm1 = { {'a', 1}, {'b', 2}, {'c', 3}, {'d', 4}, {'e', 5}, }; unordered_multimap<char, int> umm2; umm1.swap(umm2); cout << "Unordered multimap contains following elements" << endl; for (auto it = umm2.begin(); it != umm2.end(); ++it) cout << it->first << " = " << it->second << endl; return 0; }
Let us compile and run the above program, this will produce the following result −
Unordered multimap contains following elements e = 5 a = 1 b = 2 c = 3 d = 4
unordered_map.htm
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