Debug Print in Variadic Template Style

#include <string>
#include <sstream>
#include <Windows.h>

std::wstring Anchor( int i )
{
	std::wstringstream stream;
	stream << i;

	std::wstring str = L"{";
	str += stream.str() + L"}";

	return str;
}

std::wstring Replace( std::wstring fmtstr, size_t index, const std::wstring& s )
{
	size_t pos = 0;
	std::wstring anchor = Anchor( index );

	while( std::wstring::npos != pos )
	{
		pos = fmtstr.find( anchor, pos );

		if( std::wstring::npos != pos )
		{
			fmtstr.erase( pos, anchor.size() );
			fmtstr.insert( pos, s );
			pos += s.size();
		}
	}

	return fmtstr;
}

std::wstring Format( std::wstring fmt, size_t index )
{
	return fmt;
}

template<typename T, typename... Args>
std::wstring Format( std::wstring fmt, size_t index, T& t, Args&... args )
{
	std::wstringstream stream;
	stream << t;

	std::wstring result = Replace( fmt, index, stream.str() );

	++index;

	std::wstring str = Format( result, index, args... );

	return str;
}

template<typename... Args>
void DebugPrint(const wchar_t *s, Args... args)
{
#ifdef _DEBUG
	std::wstring str = Format(std::wstring(s), 0, args...);

	OutputDebugStringW(str.c_str());
#endif
}