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POWhat type of container should I use to store my ObjectID integer?
 

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  1. POWhat type of container should I use to store my ObjectID integer?
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    <p>I feel like this is a very simple, almost stupid question. I simply have forgotten what I should know how to do.</p> <p>I have GameObjects, which are stored in a universal GameObjectManager. These GameObjects have an ObjectID, which is a simple int.</p> <p>I need to be able to insert or remove these GameObjects in a 2D tile based world, where each TILE holds a container of ObjectID's.</p> <p>This way, I can grab a specific tile (ex. Tile[10][10]) and then see what GameObjects are on Tile[10][10] by reading from the container. (ex. "Ah, so Character#4302 and Item#123 are on Tile[10][10]!")</p> <p>Right now, each "Tile" is a structure in a MAP array of Tiles.</p> <pre><code> struct MapTile { std::vector &lt;int&gt; GameObject_MapList ; //list of Objects on this map location TileTerrainType tileTerrainType; //GFX to display Grass, Sand, Water, Swamp, etc. }; MapTile mlMap[100][100]; //map array </code></pre> <p>However, I read that Vectors should not be used when arbitrarily adding/removing variables. It is not like I will be removing the first or last variable in the array. Instead, I will have to call a specific ObjectID and remove it from wherever it is in the array.</p> <p>For this reason, I was thinking of using a different container. Maybe I am just too tired, but I could use some advice on what container to use, and how to go about removing SPECIFIC variables in the container.</p> <p>For example, GameObject has an ObjectID of "422". Tile[2][8] holds a container that has the following integers in order: 420, 421, 422, 433, 486, 800.</p> <p>I have a function: RemoveGameObjectFromMap(int ObjectID); So I need it to remove 422, whenever I type (RemoveGameObjectFromMap(422);</p> <p>I used to use a MAP container, but that is unnecessary. Vector, according to cplusplus.com would be bad for this.</p>
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    1. COPerhaps I am confused because I am not handling my classes correctly. The more I think about this, the more I realize I should probably allow the MAP class full access to the WORLD class's GameObjectManager. I am only doing this because my former way of handling this (a MAP which held the actual gameobjects) is because the TILES no longer hold the actual GameObjects, and instead just hold their int ObjectID.
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    2. COWhether vector is good or bad depends on a number of things. Like how many IDs per tile (on average), how frequent insertions, deletions and lookups are, how much need there is to minimise memory use, and a 100 other considerations. In short there are no simple answers. The obvious alternative to std::vector in this case though would be std::unordered_set (I'm assuming that you never want the same ID in the same tile more than once).
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    3. COThe insertions and deletions are constant. Anytime the player moves a little bit, they will be deleted and inserted to a new MapTile.
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