size_type size() const;
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// priority_queue::size
#include <iostream> // std::cout
#include <queue> // std::priority_queue
int main ()
{
std::priority_queue<int> myints;
std::cout << "0. size: " << myints.size() << '\n';
for (int i=0; i<5; i++) myints.push(i);
std::cout << "1. size: " << myints.size() << '\n';
myints.pop();
std::cout << "2. size: " << myints.size() << '\n';
return 0;
}0. size: 0 1. size: 5 2. size: 4