cppreference.com > C++ Multimaps > Container constructors & destructors Container constructors & destructors Syntax:
      #include <map>
      container();
      container( const container& c );
      ~container();
Every multimap has a default constructor, copy constructor, and destructor. The default constructor takes no arguments, creates a new instance of that multimap, and runs in constant time. The default copy constructor runs in linear time and can be used to create a new multimap that is a copy of the given multimap c. The default destructor is called when the multimap should be destroyed. For example, the following code creates a pointer to a vector of integers and then uses the default multimap constructor to allocate a memory for a new vector:
     vector<int>* v;
     v = new vector<int>();
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