#include <cstdlib>
// using std::free
#include <string_view>
#include <utility>
// using std::exchange



class CSView
{
  std::string_view view;
public:
  explicit CSView(char* ptr) noexcept
    : view(ptr)
  {}
  CSView(CSView&& o) noexcept
    : view(std::exchange(o.view, std::string_view{}))
  {}
  ~CSView()
  { std::free(const_cast<char*>(view.data())); }

  void swap(CSView& o) noexcept
  { view.swap(o.view); }

  friend void swap(CSView& left, CSView& right) noexcept
  { left.swap(right); }

  CSView& operator=(CSView&& o) noexcept
  {
    CSView tmp = std::move(o);
    swap(tmp);
    return *this;
  }
  const std::string_view& operator*() const noexcept
  { return view; }
  
  const std::string_view* operator->() const noexcept
  { return &view; }
};


#include <cstring>
// using std::strcpy
#include <iostream>
// using std::cout

int main()
{
  char* ptr = static_cast<char*>(std::malloc(80));
  std::strcpy(ptr, "Hello World\n"); 
  CSView cs { ptr };
  
  std::cout << "World at " << cs->find("World")
	    << " in " << *cs;
}