// In some languages, you can do this
// USAGE
for enemy_iterator() {
	// do things with enemy
	enemy.name = "clown";
}

// IMPLEMENTATION
enemy_iterator()
{
	chunks = get_chunks(...)
	for each chunk {
		for each enemy in chunk {
			yield; // this basically pastes the enemy.name = "clown"; in here
		}
	}
}

// ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
// To do this in C, you can do something like this (kinda cringe)
// USAGE
EnemyIterator iterator = {};
while(enemy_iterator(&iterator)) {
	iterator.enemy.name = "clown";
}

// IMPLEMENTATION
bool enemy_iterator(EnemyIterator* iterator)
{
	chunks = get_chunks(...);
	for(int i = iterator->chunk_index; i < chunk_count; i += 1) {
		Chunk chunk = chunks[i];
		iterator->chunk_index += 1;
		for(int j = iterator->enemy_index; j < chunk.enemy_count; j += 1) {
			iterator->enemy_index += 1;
			Enemy* enemy = chunk.enemies[j];
			iterator->enemy = enemy;
			return true;
		}
	}
	return false;
}