How do I call ::std::make_shared on a class with only protected or private constructors?

Question

I have this code that doesn\'t work, but I think the intent is clear:

testmakeshared.cpp

#include 

class A {
 public:
   stat         


        

Answer 1

struct A {
public:
  template std::shared_ptr static create(Arg&&...arg) {
    struct EnableMakeShared : public A {
      EnableMakeShared(Arg&&...arg) :A(std::forward(arg)...) {}
    };
    return std::make_shared(std::forward(arg)...);
  }
  void dump() const {
    std::cout << a_ << std::endl;
  }
private:
  A(int a) : a_(a) {}
  A(int i, int j) : a_(i + j) {}
  A(std::string const& a) : a_(a.size()) {}
  int a_;
};