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    <p>Game Maker enables us to control game functionality through "objects", each composed out of "events", which are triggered at certain times during a game. Within events are "actions". Firstly, it's worth noting that comparing Game Maker development with C++ is like comparing chalk and cheese. However, theoretically speaking, I'd imagine you could mirror GM functionality (albeit very inefficiently) in C++ as follows:</p> <p>The base object class could look something like this:</p> <pre><code>class CObjectBase { public: CGameSprite* sprite; int x, y; ... virtual void onEventCreate( void ) {}; virtual void onEventDestroy( void ) {}; ... virtual void onEventKeyPressedUp( void ) {}; virtual void onEventKeyPressed... ... ... (there are lots of these) // The draw event in GM (from memory) had in-built functionality: virtual void onEventDraw( void ) { CGameEngine::getSingleton()-&gt;DrawSpriteAtLocation( sprite, x, y ); } }; </code></pre> <p>You'd derive from this class and override the functions ("events") that are relevant to your object (the statements that compose these functions are your "actions"). Then there would be some sort of object instance manager singleton class which holds a list of all object instances in the current "room" and loops through each every frame (and handles instancing), triggering relevant events by calling their respective functions.</p> <p>Interestingly, this actually roughly demonstrates why a system like Game Maker lacks a degree of efficiency. There is additional, unnecessary overhead that exists in order to keep options open for the developer. The bloated base object that all objects derive from is often overkill for specific situations. For example, imagine an object with just two events used out of 50 - the object manager still blindly checks for all these other events even if they aren't utilised. Obviously optimisations can be made, but overall, the breadth of the engine ultimately results in reduced performance.</p> <p>As for your query relating to a single 'var' type, as has been stated already, this is more a characteristic of scripting, not C++. This proves that Game Maker cannot simply be modeled by C++ alone.</p>
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    1. POGameMaker-like functionality in C++
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    1. COIt's been a long time, but -1 for Singleton.
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    2. COSorry, but that's not enough of a justification for a -1 IMO. Is there something *wrong* with the answer, bar your distaste for the notion of a singleton? (which, I might add, was really just for illustrative purposes)
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    3. COAppearing to advocate one of the most permanently crippling "patterns" ever devised is certainly enough for a -1.
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