Simplest way to count instances of an object

Question

I would like to know the exact number of instances of certain objects allocated at certain point of execution. Mostly for hunting possible memory leaks(I mostly use RAII, al

Answer 1

My approach, which outputs leakage count to Debug Output (via the DebugPrint function implemented in our code base, replace that call with your own...)

#include  
#include 
class CountedObjImpl
{
public:
        CountedObjImpl(const char* className) : mClassName(className) {}
        ~CountedObjImpl()
        {
                DebugPrint(_T("**##** Leakage count for %hs: %Iu\n"), mClassName.c_str(), mInstanceCount);
        }
        size_t& GetCounter() 
        {
                return mInstanceCount;
        }

private:
        size_t mInstanceCount = 0;
        std::string mClassName;
};

template 
class CountedObj
{
public:
        CountedObj() { GetCounter()++; }
        CountedObj(const CountedObj& obj) { GetCounter()++; }
        ~CountedObj() { GetCounter()--; }

        static size_t OustandingObjects() { return GetCounter(); }

private:
        size_t& GetCounter()
        {
                static CountedObjImpl mCountedObjImpl(typeid(Obj).name());
                return mCountedObjImpl.GetCounter();
        }
};

Example usage:

class PostLoadInfoPostLoadCB : public PostLoadCallback, private CountedObj