The multimap::value_comp() method returns a comparison object that can be used to compare two elements to get whether the key of the first one goes before the second. Here the 1st object compares the object of type std::multimap::type. The arguments taken by this function object are of member type type. It is defined in multimap as an alias of pair.
multimap::compared_value value_comp() const;
Here compared_value is a nested class type
Parameters: It does not accepts any parameter.
Return Value: This method returns the comparison object which is an object of the member type multimap::compared_value, which is a nested class that uses the internal comparison object to generate the appropriate comparison functional class.
Below program illustrate the multimap value_comp() function:
a = 10 b = 20 c = 30 d = 40
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