How does MATLAB itself determine, if a plus is in fact an increment, so out = in?
Reference counting.
I do not know about class methods in this regard.
Outside of classes, in-place operations are only done inside a function of the form
function Variable = FunctionName(arguments that include Variable)
and only if the reference count for Variable is 1, and only if the outside output variable name is the same as the input variable name
In-place operations are not even done for simple code like
count = 0;
for K = 1 : 5
count = count + 1;
end
it would have to be something like
count = 0;
for K = 1 : 5
count = PlusPlus(count);
end
function var = PlusPlus(var)
var = var + 1;
end
For more discussion of in-place operations, I recommend searching postings from James Tursa
