Transform vectory by non-static member function

Question

Consider this template function:

template<class T, class F> inline
auto transform(const vector<T>& l, F func) -> vector<decltype(func(T{}))>
{
    vector<decltype(func(T{}))> out(l.size());
    std::transform(l.begin(), l.end(), out.begin(), func);
    return out;
}

This function can be called as

auto out = transform(intputVector, functor)

functor has to be either static member fuction or a global function.

Is there a way to modify the above code to work on non-static member functions as well?

struct Test {

    Test() {

        vector<int> vx = { 1, 2, 3 };
        auto vy1 = transform(vx, staticMemberFunc); // is fine
        auto vy2 = transform(vx, memberFunc); // does not compile

    }

    flt memberFunc(int x) {
        return 2 * x;
    }

    static flt staticMemberFunc(int x) {
        return 2 * x;
    }
};

Answer 1

您可以使用lambda绑定对象指针：

auto vy2 = transform(vx, [this](int x){return this->memberFunc(x);});

Answer 2

Yes,

1. use std::bind() to give you a functor which you can pass in
2. use a lambda function to do the same as 1.