mem_fn: no match for call

mem_fn.cpp

// g++ -std=c++14 -c mem_fn.cpp
//
// /usr/include/c++/7/bits/stl_algo.h:4306:24:
//      error: no match for call to ‘(std::_Mem_fn<int& (A::*)()>) (const A&)’
//
// /usr/include/c++/7/functional:174:27:
//      error: no matching function for call to ‘__invoke(int& (A::* const&)(), const A&)’
//
// /usr/include/c++/7/bits/invoke.h:89:5:
//      error: no type named ‘type’ in ‘struct std::__invoke_result<int& (A::* const&)(), const A&>’
#include <vector>
#include <functional>
#include <algorithm>

using namespace std;

struct A {
    int& getAttribute();
};

vector<int> foo(const vector<A>& as) {
    vector<int> is;
    transform(as.begin(), as.end(), back_inserter(is), mem_fn(&A::getAttribute));
    return is;
}