相关疑难解决方法(0)

这是我在尝试将unique_ptr用于pimpl时所看到的简化.我选择了unique_ptr,因为我真的希望类拥有指针 - 我希望pimpl指针和类的生命周期相同.

无论如何,这是标题:

#ifndef HELP
#define HELP 1

#include <memory>

class Help
{

public:

  Help(int ii);
  ~Help() = default;

private:

  class Impl;
  std::unique_ptr<Impl> _M_impl;
};

#endif // HELP

这是来源:

#include "Help.h"

class Help::Impl
{
public:
  Impl(int ii)
  : _M_i{ii}
  { }

private:

  int _M_i;
};

Help::Help(int ii)
: _M_impl{new Help::Impl{ii}}
{ }

我可以将它们编译成一个库就好了.但是当我尝试在测试程序中使用它时,我得到了

ed@bad-horse:~/ext_distribution$ ../bin/bin/g++ -std=c++0x -o test_help test_help.cpp Help.cpp
In file included from /home/ed/bin/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/memory:86:0,
                 from Help.h:4,
                 from test_help.cpp:3:
/home/ed/bin/lib/gcc/x86_64-unknown-linux-gnu/4.7.0/../../../../include/c++/4.7.0/bits/unique_ptr.h: In instantiation of 'void std::default_delete<_Tp>::operator()(_Tp*) const [with _Tp = …