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C++ Map Library - multimap() Function
Description
The C++ function std::multimap::multimap() constructs a multimap with copy of each elements present in existing container other.
Declaration
Following is the declaration for std::multimap::multimap() function form std::map header.
C++98
multimap (const multimap& other);
C++11
multimap (const multimap& other); multimap (const multimap& other, const allocator_type& alloc);
Parameters
other − Another multimap object of same type.
alloc − The allocator object.
Return value
Constructor never returns value.
Exceptions
No effect on container if exception is thrown.
Time complexity
Linear i.e. O(n)
Example
The following example shows the usage of std::multimap::multimap() function.
#include <iostream> #include <map> using namespace std; int main(void) { /* Multimap with duplicates */ multimap<char, int> m1 = { {'a', 1}, {'a', 2}, {'b', 3}, {'c', 4}, {'c', 5}, }; multimap<char, int>m2(m1); cout << "Multimap contains following elements:" << endl; for (auto it = m2.begin(); it != m2.end(); ++it) cout << it->first << " = " << it->second << endl; return 0; }
Let us compile and run the above program, this will produce the following result −
Multimap contains following elements: a = 1 a = 2 b = 3 c = 4 c = 5
map.htm
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