ouonline / luacpp Goto Github PK

Thank you for your code. I am finding it useful. I have one question. I am trying to define a function on the C++ side that will be available on the lua side to compute the AND of a list of numbers. That requires looping thru every table element as follows.

auto AND = l.CreateFunction([](luacpp::LuaTable t) -> float
{
float result = t.GetNumber(1);
int i = 2;
// Size() is a function I wrote and added to luacpp
while (i <= t.Size())
{
result = result * t.GetNumber(i);
i++;
}
return result;
}, "AND");

If you note there is a Size() function here. I had to add that myself to lua_table.h/lua_table.cpp because I couldn't figure out how to loop thru every element of the table otherwise. I was previously using your ForEach() function like this along with a global variable called tCount defined outside the function scope.

// AND function. Same deal as or.
auto AND = l.CreateFunction([](luacpp::LuaTable t) -> float
{
// Function to check for lua table size. This is really bad coding but I
// dont know if my lua C++ wrapper can do it any other way.
tCount = 0;
auto iterfunc = [](const luacpp::LuaObject& key, const luacpp::LuaObject& value) -> bool
{
tCount++;
return true;
};
t.ForEach(iterfunc);

	float result = t.GetNumber(1);
	int i = 2;
	while (i <= tCount)
	{
		result = result * t.GetNumber(i);
		i++;
	}
	return result;
}, "AND");

I mean I have it working. But I figured you must have some intended way to do this that I just couldn't figure out.