size_type size() const;
size_type size() const noexcept;
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// multimap::size
#include <iostream>
#include <map>
int main ()
{
std::multimap<char,int> mymultimap;
mymultimap.insert(std::make_pair('x',100));
mymultimap.insert(std::make_pair('y',200));
mymultimap.insert(std::make_pair('y',350));
mymultimap.insert(std::make_pair('z',500));
std::cout << "mymultimap.size() is " << mymultimap.size() << '\n';
return 0;
}mymultimap.size() is 4