How to correctly initialize member variable of template type?

Question

suggest i have a template function like following:

template
void doSomething()
{
    T a; // a is correctly initialized if T is a class with a         


        

Answer 1

Like so:

T a{};

---

Pre-C++11, this was the simplest approximation:

T a = T();

But it requires T be copyable (though the copy is certainly going to be elided).

Answer 2

Class template field in C++11 has the same syntax:

template <class T>
class A {
  public:
    A() {}
    A(T v) : val(v) {}
  private:
    T val{};
};