ATL / WTL / STL

'class' : multiple copy constructors specified

The class has multiple copy constructors of a single type. The first constructor is used.

class TheClass {
    int member;
public:
    void DoSomething();
};

// Header file
struct Impl; // Forward decl
class TheClass {
     std::auto_ptr<Impl> pimpl;
public:
     TheClass();
     void DoSomething();
};

// Cpp file
struct Impl {
     int member;
};
 
TheClass::TheClass() : pimpl(new Impl) { }
void TheClass::DoSomething() { manipulate(pimpl->member); }

//dumb class optimized away by the compiler in releases builds
template <class T> class _NoMT 
{
public:
static lock() {};
static unlock() {};
};

template <class T = _NoMT > class CMTServices 
{
T* p_;
public:
static lock() {p->lock} ;
static unlock() {p->unlock};
};


template <class T, Class Y= CMTServices> class Xpto 
{

 Y* lock_;
 void foo()
{
 lock_->lock();
 doSomething();
 lock_->unlock();  
}

};