Ｃ＋＋语法游戏

游戏而已，，可以用来锻炼脑筋。。~~//using.h#pragma once//for IUnknown#include "atlbase.h"#define USING_SCOPE_ASSERT(x) ATLASSERT(x);#define USING_SCOPE_INLINE inline#define Using(expression) if(UsingScope UsingScope_LocalVar=(expression))class UsingScope{ class Container { public:  virtual ~Container()  {  } }; Container* pc;public: USING_SCOPE_INLINE operator bool () {  return true; } USING_SCOPE_INLINE ~UsingScope() {  delete pc; } template class SimplePointerContainer:public Container {  T* p; public:  SimplePointerContainer(T* p)  {   USING_SCOPE_ASSERT(p!=NULL);   this->p=p;  }  virtual ~SimplePointerContainer()  {   delete p;  } }; template USING_SCOPE_INLINE UsingScope(T* p) {  pc=new SimplePointerContainer(p); } class IUnknownContainer:public Container {  IUnknown* punk; public:  IUnknownContainer(IUnknown* punk)  {   USING_SCOPE_ASSERT(punk!=NULL);   this->punk=punk;  }  virtual ~IUnknownContainer()  {   punk->Release();  } }; USING_SCOPE_INLINE UsingScope(IUnknown* punk) {  pc=new IUnknownContainer(punk); } class BSTRContainer:public Container {  BSTR bstr; public:  BSTRContainer(BSTR bstr)  {   USING_SCOPE_ASSERT(bstr!=NULL);   this->bstr=bstr;  }  virtual ~BSTRContainer()  {   SysFreeString(bstr);  } }; USING_SCOPE_INLINE UsingScope(BSTR bstr) {  pc=new BSTRContainer(bstr); } //vc7 m 可以为System::IDisposable* 添加 .Dispose() 的调用 //以支持所有的dotnet System::IDisposable的实现者};//usingT.h#include "Using.h"#define UsingT(type,varname,expression) if(UsingScopeT varname=(expression))templateclass UsingScopeT{ template class Container { public:  T* p;  Container(T* p)  {   USING_SCOPE_ASSERT(p!=NULL);   this->p=p;  }  virtual ~Container(){} }; Container* pc;public: USING_SCOPE_INLINE operator bool () {  return true; } USING_SCOPE_INLINE T* operator -> () {  return (pc->p); } USING_SCOPE_INLINE operator T*() const {  return (T*)(pc->p); } USING_SCOPE_INLINE T& operator*() const {  return *(pc->p); } USING_SCOPE_INLINE T** operator&() {  return &(pc->p); } USING_SCOPE_INLINE bool operator==(T* pT) const {  return (pc->p) == pT; } USING_SCOPE_INLINE ~UsingScopeT() {  delete pc; } template class SimplePointerContainer:public Container { public:  SimplePointerContainer(T* p):Container(p)  {  }  virtual ~SimplePointerContainer()  {   delete p;  } }; template USING_SCOPE_INLINE UsingScopeT(T* p) {  pc=new SimplePointerContainer(p); } class IUnknownContainer:public Container { public:  IUnknownContainer(IUnknown* punk):Container(punk)  {  }  virtual ~IUnknownContainer()  {   p->Release();  } }; USING_SCOPE_INLINE UsingScopeT(IUnknown* punk) {  pc=new IUnknownContainer(punk); } class BSTRContainer:public Container { public:  BSTRContainer(BSTR bstr):Container(bstr)  {  }  virtual ~BSTRContainer()  {   SysFreeString(p);  } }; USING_SCOPE_INLINE UsingScopeT(BSTR bstr) {  pc=new BSTRContainer(bstr); } //vc7 m 可以为System::IDisposable* 添加 .Dispose() 的调用 //以支持所有的dotnet System::IDisposable的实现者};//Using.Cpp// Using.cpp : Defines the entry point for the console application.//#include "stdafx.h"#include "atlbase.h"#include "Using.h"#include "UsingT.h"class ClassA{public: ClassA() {  _tprintf(_T("ClassA()\n")); } virtual ~ClassA() {  _tprintf(_T("~ClassA()\n")); } virtual void Write() {  _tprintf(_T("ClassA::Write\n")); }};class ClassB:public ClassA{public: virtual void Write() {  _tprintf(_T("ClassB::Write\n")); }};ClassA* CreateClassA(){ return new ClassB();}IUnknown* ReturnUnknown(){ HRESULT hres; IUnknown* p; CLSID cid; hres=CLSIDFromProgID(L"JScript",&cid); hres=CoGetClassObject(cid,CLSCTX_INPROC_SERVER,NULL,IID_IClassFactory,(void**)&p); return p;}void DoIt(){ CoInitialize(NULL); IUnknown* punk; Using(punk=ReturnUnknown()) {  ClassA* pa;  Using(pa=CreateClassA())  {   _tprintf(_T("DoWork\n"));   pa->Write();  } } UsingT(ClassB,pb,new ClassB()) {  pb->Write();  ClassA* pa=pb;  if(pa==pb)   pa->Write(); } UsingT(IUnknown,p,ReturnUnknown()) {  //p->.. } CoUninitialize();}int main(int argc, char* argv[]){ DoIt(); return 0;}

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//using.h
#pragma once
//for IUnknown
#include \"atlbase.h\"
#define USING_SCOPE_ASSERT(x) ATLASSERT(x);
#define USING_SCOPE_INLINE inline
#define Using(expression) if(UsingScope UsingScope_LocalVar=(expression))
class UsingScope{
class Container {
public:
  virtual ~Container()  {  }
};
Container* pc;
public:
USING_SCOPE_INLINE operator bool () {
  return true;
}
USING_SCOPE_INLINE ~UsingScope() {
  delete pc;
}
template class SimplePointerContainer:public Container {
  T* p;
public:
  SimplePointerContainer(T* p)  {
   USING_SCOPE_ASSERT(p!=NULL);   
   this->p=p;
  }
  virtual ~SimplePointerContainer()  {
   delete p;
  }
};
template USING_SCOPE_INLINE UsingScope(T* p) {
  pc=new SimplePointerContainer(p);
}
class IUnknownContainer:public Container {
  IUnknown* punk;
public:
  IUnknownContainer(IUnknown* punk)  {  
   USING_SCOPE_ASSERT(punk!=NULL);
   this->punk=punk;
  }
  virtual ~IUnknownContainer()  {
   punk->Release();  
  }
};
USING_SCOPE_INLINE UsingScope(IUnknown* punk) {
  pc=new IUnknownContainer(punk);
}
class BSTRContainer:public Container {
  BSTR bstr;
public:  
  BSTRContainer(BSTR bstr)  {
   USING_SCOPE_ASSERT(bstr!=NULL);  
   this->bstr=bstr;
  }
  virtual ~BSTRContainer()  {
   SysFreeString(bstr);
  }
};
USING_SCOPE_INLINE UsingScope(BSTR bstr) {
  pc=new BSTRContainer(bstr);
}
//vc7 m 可以为System::IDisposable* 添加 .Dispose() 的调用
//以支持所有的dotnet System::IDisposable的实现者};
//usingT.h
#include \"Using.h\"
#define UsingT(type,varname,expression) if(UsingScopeT varname=(expression))
template class UsingScopeT{
  template class Container {
  public:
   T* p;
   Container(T* p)  {
    USING_SCOPE_ASSERT(p!=NULL);  
    this->p=p;
   }
   virtual ~Container(){} };
   Container* pc;
public:
  USING_SCOPE_INLINE operator bool () {
   return true;
  }
  USING_SCOPE_INLINE T* operator -> () {
   return (pc->p);
  }
  USING_SCOPE_INLINE operator T*() const {
   return (T*)(pc->p);
  }
  USING_SCOPE_INLINE T& operator*() const {
   return *(pc->p);
  }
  USING_SCOPE_INLINE T** operator&() {
   return &(pc->p);
  }
  USING_SCOPE_INLINE bool operator==(T* pT) const {
   return (pc->p) == pT;
  }
  USING_SCOPE_INLINE ~UsingScopeT() {
   delete pc;
  }
  template class SimplePointerContainer:public Container {
  public:
   SimplePointerContainer(T* p):Container(p)  {  }
   virtual ~SimplePointerContainer()  {
    delete p;
   }
  };
  template USING_SCOPE_INLINE UsingScopeT(T* p) {
   pc=new SimplePointerContainer(p);
  }
  class IUnknownContainer:public Container {
  public:
   IUnknownContainer(IUnknown* punk):Container(punk)  {  }
   virtual ~IUnknownContainer()  {
    p->Release();
   }
  };
  USING_SCOPE_INLINE UsingScopeT(IUnknown* punk) {
   pc=new IUnknownContainer(punk);
  }
  class BSTRContainer:public Container {
  public:  
   BSTRContainer(BSTR bstr):Container(bstr)  {  }
   virtual ~BSTRContainer()  {
    SysFreeString(p);
   }
  };
  USING_SCOPE_INLINE UsingScopeT(BSTR bstr) {
   pc=new BSTRContainer(bstr);
  }
  //vc7 m 可以为System::IDisposable* 添加 .Dispose() 的调用
  //以支持所有的dotnet System::IDisposable的实现者};
  //Using.Cpp
  // Using.cpp : Defines the entry point for the console application.
#include \"stdafx.h\"
#include \"atlbase.h\"
#include \"Using.h\"
#include \"UsingT.h\"
class ClassA{
public:
ClassA() {
  _tprintf(_T(\"ClassA()\n\"));
}
virtual ~ClassA() {
  _tprintf(_T(\"~ClassA()\n\"));
}
virtual void Write() {
  _tprintf(_T(\"ClassA::Write\n\"));
}
};
class ClassB:public ClassA{
public:
virtual void Write() {
  _tprintf(_T(\"ClassB::Write\n\"));
}
};
ClassA* CreateClassA(){
return new ClassB();
}
IUnknown* ReturnUnknown(){
HRESULT hres;
IUnknown* p;
CLSID cid;
hres=CLSIDFromProgID(L\"JScript\",&cid);
hres=CoGetClassObject(cid,CLSCTX_INPROC_SERVER,NULL,IID_IClassFactory,(void**)&p);
return p;
}
void DoIt(){
CoInitialize(NULL);
IUnknown* punk;
Using(punk=ReturnUnknown()) {
  ClassA* pa;
  Using(pa=CreateClassA())  {
   _tprintf(_T(\"DoWork\n\"));
   pa->Write();  
  }
}
UsingT(ClassB,pb,new ClassB()) {
  pb->Write();
  ClassA* pa=pb;
  if(pa==pb)
   pa->Write();
}
UsingT(IUnknown,p,ReturnUnknown()) {
  //p->.. } CoUninitialize();}int main(int argc, char* argv[]){ DoIt(); return 0;}