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#include <queue>
#include <vector>
using namespace std;
 
bool cmp(int x, int y) { return (x > y); }
 
class A {
public:
private:
    priority_queue<int, vector<int>, decltype(cmp) > pq(cmp); // Error at pq(cmp) : function "cmp" is not a type name
};
 
 
int main() {
 
    priority_queue<int, vector<int>, decltype(cmp) > pq(cmp); // no error here
    return 0;
}

prog.cpp:10:57: error: 'cmp' is not a type
     priority_queue<int, vector<int>, decltype(cmp) > pq(cmp); // Error at pq(cmp) : function "cmp" is not a type name
                                                         ^
In file included from /usr/include/c++/5/queue:64:0,
                 from prog.cpp:1:
/usr/include/c++/5/bits/stl_queue.h: In instantiation of 'class std::priority_queue<int, std::vector<int>, bool(int, int)>':
prog.cpp:16:60:   required from here
/usr/include/c++/5/bits/stl_queue.h:391:18: error: field 'std::priority_queue<int, std::vector<int>, bool(int, int)>::comp' invalidly declared function type
       _Compare   comp;
                  ^

Standard output is empty