value_ptr_example_pimpl.hpp

struct Foo {
  int bar() { 
    return ptr->bar(); 
  }

  Foo(int x); 
  
  // Thanks to value_ptr we get value semantics for free
  Foo(Foo const&) = default;
  Foo& operator=(Foo const&) = default;
  ~Foo() = default;

  struct Pimpl;
  value_ptr<Pimpl> ptr;
};