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C++ Map Library - operator== Function
Description
The C++ function std::multimap::operator== tests whether two mutlimaps are equal or not.
Declaration
Following is the declaration for std::multimap::operator== function form std::map header.
C++98
template <class Key, class T, class Compare, class Alloc> bool operator== ( const multimap<Key,T,Compare,Alloc>& m1, const multimap<Key,T,Compare,Alloc>& m2);
Parameters
m1 − First multimap object.
m2 − Second multimap object.
Return value
Returns true if both mutlimap are equal otherwise false.
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::operator== function.
#include <iostream> #include <map> using namespace std; int main(void) { /* Multimap with duplicates */ multimap<char, int> m1; multimap<char, int> m2; if (m1 == m2) cout << "Both multimaps are equal." << endl; m1.insert(pair<char, int>('a', 1)); if (!(m1 == m2)) cout << "Both multimaps are not equal." << endl; return 0; }
Let us compile and run the above program, this will produce the following result −
Both multimaps are equal. Both multimaps are not equal.
map.htm
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