C++17: Template deduction of constructors

C++17 allows template deduction of constructors. Here is an example:

#include <iostream>

struct MyStruct
{
  template<typename T>
  MyStruct(T t)
  {
    std::cout << "T : ";
  }
};

template<>
MyStruct::MyStruct(int i)
{
  std::cout << "int : ";
}

template<>
MyStruct::MyStruct(double d)
{
  std::cout << "double : ";
}

int main()
{
  MyStruct myStructInt(1);
  MyStruct myStructDouble(2.2);
  MyStruct myStructString("Hello");
  std::cout << std::endl;

  return 0;
}
// Output: int : double : T :

Reference: https://en.wikipedia.org/wiki/C%2B%2B17