Perhaps you are missing something somewhere, the code below works as intended:
#include <vector>
#include <algorithm>
#include <iostream>
struct greater1{
bool operator()(const long& a,const long& b) const{
return a>b;
}
};
int main() {
std::vector<long> humble;
humble.push_back(15);
humble.push_back(15);
humble.push_back(9);
humble.push_back(25);
std::make_heap(humble.begin(), humble.end(), greater1());
while (humble.size()) {
std::pop_heap(humble.begin(),humble.end(),greater1());
long min = humble.back();
humble.pop_back();
std::cout << min << std::endl;
}
return 0;
}