AutoTimer “Making Pimpl Easy”版

AutoTimer.h

#include <boost/enable_shared_from_this.hpp>#include <string>using namespace std;class AutoTimer : public pimpl<AutoTimer>::pointer_semantics,  public boost::enable_shared_from_this<AutoTimer>{public:AutoTimer(const std::string &name);~AutoTimer(void);};

AutoTimer.cpp

#include "AutoTimer.h"#include <iostream>#include <windows.h>#include <string>template<> struct pimpl<AutoTimer>::implementation{implementation (string k) : mName(k)   { mStartTime = GetTickCount();}double GetElapsed() const;string mName;DWORD mStartTime;};template<> double pimpl<AutoTimer>::implementation::GetElapsed() const{return (GetTickCount()-mStartTime) / 1e3;}AutoTimer::AutoTimer (const std::string &name) : base(name) {}AutoTimer::~AutoTimer(void){ implementation const& self = **this; std::cout<<self.mName<< ": took " << self.GetElapsed() << " secs" << std::endl;}

main.cpp

int _tmain(int argc, _TCHAR* argv[]){AutoTimer timer("MyTimer");for (int i = 0; i < 1000; ++i){cout << ".";}cout << endl;return 0;}