could someone explain why... (constructors and dynamic memory)

DrewDough · 2004-06-07T22:41:52

high, this has been bothering me for awhile and now id like to figure it out... I have been having some problems with constructors. For all of my classes, i have an Init() function.. this is because i have such problems with construtors, but now id like to get rid of these ugly Init() functions... heres the problem : i have a bunch of global objects. Player, list < Enemy >, Map, System, Messages, ETC.. i have global instances of all of these classes. Now, inside the constructor for say Player or Enemy, i would try to do something like this: texture = systm.Load_Texture("path"); ERROR! doesnt work because systm and this object are global, which means when this constructor is called systm doesnt even exist yet! (systm is a global object of type System) ok, this happends with lots of things, where one classes constructor would depend on another class.. so i gave each class an Init() function and just called it in the begining of main... this "solved" my problem.. now on to my next problem : dynamic memory that is part of a class. lets say i do this to my Enemy class: Enemy::Enemy() { somenumber = new int; } ~Enemy::Enemy() { delete somenumber; } if i try doing something like this, the game will crash when it first starts up. if i log " CONSTRUCTOR CALLED" or "DESTRUCTOR CALLED", i get 3 extra destructor calls (there just so happends to be 3 enemies, too)... i think this is because im using a list. when i read in an enemy from a map, i will do something like: Enemy temp; temp.x = blah; temp.y = blah; enemy_list.push_back(temp); right about now is where my log tells me "const called, dest called" for each enemy... then, at the end of the game, when the enemies fall out of scope, i get 3 calls to destructors... where do those 3 calls to constructors go that should have went? i think i have to do something with a copy constructor but i tried that and no luck (i probably did it wrong)... thanks for any help!! [edited by - graveyard filla on June 7, 2004 2:05:21 AM] [edited by - graveyard filla on June 7, 2004 2:46:41 AM]

For Beginners

Started by graveyard filla June 07, 2004 12:48 AM

19 comments, last by graveyard filla 19 years, 10 months ago

kdogg

204

June 07, 2004 10:41 PM

You might find it easier and faster to put pointers to your objects into the STL containers. Then you don''t have to worry about copy constructors and the sort. Of course, it''s good practice to have copy constructors anyways.

could someone explain why... (constructors and dynamic memory)

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could someone explain why... (constructors and dynamic memory)

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