std::promise where T must be default constructible in Visual Studio 2017?

Question

I am trying to compile the following code in Visual Studio 2017:

#include 

int main()
{
    std::promise&         


        

Answer 1

Looks like it is a known issue in MSVC's standard library implementation. A simpler reproduction scenario:

#include 
struct NoDefaultCtor
{
    NoDefaultCtor() = delete;
};
int main() {
    std::promise p;
    return 0;
}