Re: Dynamic storage duration

On Apr 10, 10:35 pm, Rolf Magnus <ramag...@t-online.de> wrote:


Checking the FAQ I dont think I will. Below is a trivial example of
what I am actually doing.

#include <iostream>
#include <memory>

class Impl;

class pImpl
{
  private:
    friend class Impl;
    friend class std::auto_ptr<pImpl>;
    pImpl() {};
    ~pImpl() {};
    pImpl(const pImpl &);
    pImpl &operator=(const pImpl &);

    void print_some_stuff() { std::cout << "Hi\n"; };
};

class Impl
{
  public:
    Impl()
    {
      if(_pimpl.get()==0)
      {
        std::auto_ptr<pImpl> temp(new pImpl);
        _pimpl=temp;
      }
    };

    void print_some_stuff() { _pimpl->print_some_stuff(); };
  private:
    Impl(const Impl &);
    Impl &operator=(const Impl &);
    static std::auto_ptr<pImpl> _pimpl;
};

std::auto_ptr<pImpl> Impl::_pimpl;

void foo();
void bar();

int main(int argc, char *argv[])
{
  foo();
  Impl().print_some_stuff();
  bar();

  return 0;
}

void foo()
{
  Impl().print_some_stuff();
}

void bar()
{
  foo();
  Impl().print_some_stuff();
}