Debug helper for std::function wrapped lambda

debuggablelambda.cpp

#include <vector>
#include <functional>

template<class F>
struct DebuggableLambda : F
{
	template<class F2>
	DebuggableLambda(F2&& func, const char* file, int line)
		: F(std::forward<F2>(func))
		, file(file)
		, line(line)
	{
	}

	using F::operator();

	const char* file;
	int line;
};

template<class F>
auto MakeDebuggableLambda(F&& func, const char* file, int line)
-> DebuggableLambda<typename std::remove_reference<F>::type>
{
	return { std::forward<F>(func), file, line };
}

#define ENABLE_DEBUG_LAMBDA 1

#if ENABLE_DEBUG_LAMBDA
	#define DEBUGGABLE_LAMBDA(F)\
	MakeDebuggableLambda(F, __FILE__, __LINE__)
#else
	#define DEBUGGABLE_LAMBDA(F) F
#endif

/////////////////////////////////////////////////////////////////////

std::vector<std::function<bool(int)>> testvec;

int testfunc()
{
	testvec.emplace_back([](int x)
	{
		return x > 10000;
	});

	testvec.emplace_back(DEBUGGABLE_LAMBDA([](int x)
	{
		return x % 2 == 0;
	}));

	//also works with lvalue lambda
	int n = 30;
	auto lambdalvalue = [n](int x) {return x < n; };
	testvec.push_back(DEBUGGABLE_LAMBDA(lambdalvalue));

	return testvec.size();
}

int main()
{
	int x = testfunc();
	return x+1;
}