ApplyToVec.cpp

#include <vector>
#include <functional>

template<typename R, typename T>
std::function<std::vector<R>(std::vector<T>&)>
ApplyToVec(R(T::*m)()) {
    auto applyToEach = [m](std::vector<T> &v) {
        std::vector<R> r;
        r.reserve(v.size());
        for (auto &e : v) {
            r.emplace_back((e.*m)());
        }
        return r;
    };
    return applyToEach;
}

class A {
    public:
    int foo() { return 42; };
};

int main() {
    std::vector<A> v(3);
    auto r = ApplyToVec(&A::foo)(v);

    return 0;
}