我需要的类型DizzyCreature(我班)的双指针指向DizzyCreature指针数组。当我运行它,我得到访问冲突读取位置0X ......。我可以做一个DizzyCreature *并调用它的成员函数就好了,但是,当无法通过阵列运行,并做同样的事情对每个OBJ。
I need a double pointer of type DizzyCreature (my class) to point to an array of DizzyCreature pointers. When I run it I get "Access violation reading location 0x...". I can make a DizzyCreature* and call its member functions just fine, but when cannot run through the array and do the same thing for each obj.
我以下说明: www.cplusplus/forum/beginner/10377/
code
Server.h:
class Server { public: Server(int x, int y, int count); ~Server(void); void tick(); private: DizzyCreature** dcArrPtr; DizzyCreature* dcPtr; int _count; };Server.cpp:
Server.cpp:
Server::Server(int x, int y, int count) { dcPtr = new DizzyCreature[count]; // this works just fine dcArrPtr = new DizzyCreature*[count]; // this doesn't (but gets past this line) _count = count; } Server::~Server(void) { delete[] *dcArrPtr; delete[] dcPtr; } void Server::tick() { dcPtr->takeTurn(); // just fine for (int i = 0; i < _count; i++) { dcArrPtr[i]->takeTurn(); // crash and burn } }编辑:成员函数takeTurn()是在父类DizzyCreature的。该方案使得它进入的功能,但只要它试图改变一个私有成员变量中的异常。如果它的事项,DizzyCreature的类型是GameCreature和WhirlyB的,因为这是对MI赋值。
The member function takeTurn() is in a parent class of DizzyCreature. The program makes it into the function, but as soon as it attempts to change a private member variable the exception is thrown. If it matters, DizzyCreature is of type GameCreature and WhirlyB as this is an assignment on MI.
推荐答案您已经分配的空间,但此数组中没有分配每个对象。您必须执行以下操作:
You have allocated space for dcArrPtr, but didn't allocate every object in this array. You must do following:
Server::Server(int x, int y, int count) { dcPtr = new DizzyCreature[count]; dcArrPtr = new DizzyCreature*[count]; for ( int i = 0; i < count; i++ ) { dcArrPtr[ i ] = new DizzyCreature; } _count = count; } Server::~Server(void) { for ( int i = 0; i < count; i++ ) { delete dcArrPtr[ i ]; } delete[] *dcArrPtr; delete[] dcPtr; }更多推荐
动态地分配对象数组
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