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rotor-nelua's Issues

Add new rotor concept: `entity_compatible_with(MyEntity.value)` and it's `ptr` variant

This eases development with derived entities.

Usage example:

local rotor_concepts = require 'rotor.concepts'

local SpriteEntity = @entity(@record{
  entity_data: EntityData,
  sprite: Sprite,
  painter: Painter,
})

local an_sprite_entity_ptr = #[rotor_concepts.value.entity_ptr_compatible_with(SpriteEntity.value)]#

local Inputs = @record{ --[[...]] }

function SpriteEntity.derived_init(sprite_entity: an_sprite_entity_ptr, inputs: Inputs)
  sprite_entity.entity_data = {
    id = inputs.sprite.id,
    mask = inputs.sprite.mask,
  }

  -- ...
end

`storageT:push` should also return a reference to the newer entry

If I push an entity and then need to make some configuration on it, then something like this is needed:

local ok, id = Enemy.storage:push(Enemy.Entity.init(pos))
check(ok, 'error: enemy could not be pushed to storage')

local ok, enemy = Enemy.storage:mget(id)
check(ok, 'error: enemy could not be got from storage')

enemy.collider.entity_id = id

If push also returned a reference to the pushed entry, then this nicer code would be possible:

local ok, id, enemy = Enemy.storage:push(Enemy.Entity.init(pos))
check(ok, 'error: enemy could not be pushed to storage')

enemy.collider.entity_id = id

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