Question

I have a lot of deques defined, and when I need to do things like erase or pop all of them, I’ve just had to do it to every deque specifically.
What i thought could make it easier was to put the deques in an array or list of some kind, which I could loop through.

What I want to do is something like this (Basicly just pseudocode):

deque<f32> pos, vel, rot, prop;
deque deques[] = {pos, vel, rot, prop};
for(i=0; i<deques.length; i++) deques[i].pop_back();

(But it doesn’t work)

Answer 1

Here you declare a simple unmanaged array:

deque deques[] = {pos, vel, rot, prop}; 

…but you forget to declare the full specialised type of its contents, which should be deque<f32> not just a naked deque.

Now, you try to iterate over your array,

for(i=0; i<deques.length; i++) deques[i].pop_back(); 

…but simple C-style arrays don’t have methods like length. You seem to be trying to write C#, not C++!

Try this:

std::array<std::deque<float>, 4> deques = { pos, vel, rot, prop };
for(auto i=0; i<deques.size(); i++) deques[i].push_back(1.0f);

etc.