Composites-Visitors pattern: the OOP way

// Trace.h
//	debug tracer

#pragma once

namespace GE_{ namespace NUtil{

	using namespace NTypes;
	
	struct STrace //do trace into debug
	{
	private:
		static int& _Deep() {	static int deep=0; return deep; }
		UINT _filter; // the filter value for this trace object
	public:
		//_Filter is the warning level: the lower the level, the greater are thre received messages
		static UINT& _Filter() { static UINT filter = 0; return filter; }
		STrace(UINT filter) {	_filter = filter; _Deep()++;	}
		~STrace() {	_Deep()--; }
		void operator() (LPCTSTR format, ...); //printf like syntax
		void createmsg(const type_info& ti, LPVOID address);
		void deletemsg(const type_info& ti, LPVOID address);
	};


#ifdef _DEBUG
	inline void STrace::operator() (LPCTSTR format, ...)
	{
		if(_filter < _Filter()) return;
		TCHAR s[1024]; memset(s,0,sizeof(s));
		int m = _stprintf(&s[0], "(%4u)", _filter);
		memset(&s[m],'.',sizeof(TCHAR)*_Deep());
		va_list params;
		int n = _vstprintf(&s[_Deep()+m], format, va_start(params, format));
		_RPT0(_CRT_WARN, &s[0]);
	}

	inline void STrace::createmsg(const type_info& ti, LPVOID address)
	{
		operator()("Create %s @ %p\n", ti.name(), address);
	}

	inline void STrace::deletemsg(const type_info& ti, LPVOID address)
	{
		operator()("Delete %s @ %p\n", ti.name(), address);
	}

#else
	inline void STrace::operator() (LPCTSTR format, ...) {}
	inline void STrace::createmsg(const type_info& ti, LPVOID address) {}
	inline void STrace::deletemsg(const type_info& ti, LPVOID address) {}
#endif


}}

#ifdef _DEBUG
#define STRACE(variable,lev,command) GE_::NUtil::STrace variable(lev); variable command;
#else
#define STRACE(variable,lev,command) //defined as "empty"
#endif