Method removeComponent

src/components/Components.cpp:108–156

Remove a component at a given index

// Remove a component at a given index
void Components::removeComponent(Entity entity) {

    assert(mMapEntityToComponentIndex.containsKey(entity));

    uint32 index = mMapEntityToComponentIndex[entity];

    assert(index < mNbComponents);

    // We want to keep the arrays tightly packed. Therefore, when a component is removed,
    // we replace it with the last element of the array. But we need to make sure that enabled
    // and disabled components stay grouped together.

    // Destroy the component
    destroyComponent(index);

    // If the component to remove is disabled
    if (index >= mDisabledStartIndex) {

        // If the component is not the last one
        if (index != mNbComponents - 1) {

            // We replace it by the last disabled component
            moveComponentToIndex(mNbComponents - 1, index);
        }
    }
    else {   // If the component to remove is enabled

        // If it not the last enabled component
        if (index != mDisabledStartIndex - 1) {

            // We replace it by the last enabled component
            moveComponentToIndex(mDisabledStartIndex - 1, index);
        }

        // If there are disabled components at the end
        if (mDisabledStartIndex != mNbComponents) {

            // We replace the last enabled component by the last disabled component
            moveComponentToIndex(mNbComponents - 1, mDisabledStartIndex - 1);
        }

        mDisabledStartIndex--;
    }

    mNbComponents--;

    assert(mDisabledStartIndex <= mNbComponents);
    assert(mNbComponents == static_cast<uint32>(mMapEntityToComponentIndex.size()));
}

// Notify if a given entity is disabled (sleeping) or not
void Components::setIsEntityDisabled(Entity entity, bool isDisabled) {