I think a lot of people have trouble with knowing how to get the size of an array,
so a while ago I created a function for getting the size of an array,
and a demo showing how to use that function.
(By size, I mean the number of elements in the array,
not the size in bytes - that’s what sizeof is for.)
I recently spent a few hours filling in the README to explain how it works,
and why the function should be implemented in that particular way,
so I’ve decided to make a thread linking to it in the hopes that people will have an easier time finding out about it,
and in the hopes that people will find it useful:
Essentially the function is:
template< typename Type, size_t size >
constexpr size_t getSize(const Type (&)[size]) noexcept
{
return size;
}
And it’s used like:
// An example array
int example[4];
// Gets 4
constexpr size_t size = getSize(example);
You can also use it in loops:
// An example array
int example[4];
for(size_t index = 0; index < getSize(example); ++index)
{
int value = example[index];
}
(You could use a ranged for loop instead, but sometimes you need the index.)
And it will also work on arrays in progmem.
