我有一个向量,添加包含SDL_Surface
指针作为数据成员的对象,这意味着我必须使用复制构造函数来实现指针的深度复制。该对象释放析构函数中的曲面(指针),这是问题发生的地方。目前对象被添加到向量中(通过按下按钮)程序崩溃,但是当我从析构函数(内存泄漏)中拿走SDL_FreeSurface(surface)
时,程序不会崩溃,当我将该对象添加到向量时。如何正确地将对象添加到矢量中?有些人可能会认为问题在于析构函数试图删除悬挂指针,但是在向量中创建对象时发生错误。C++添加指针到对象的对象
class Block{
public:
Block(int x, int y, MediaFunctions &M_Functions);
Block(const Block& source);
~Block();
private:
SDL_Surface *block_surface_names;
SDL_Surface *block_surface_hours;
SDL_Surface *block_names_detected;
SDL_Surface *block_hours_detected;
SDL_Rect block_rect_names;
SDL_Rect block_rect_hours;
};
////////////////////
Block::Block(int x, int y, MediaFunctions &M_Functions){
block_surface_names = M_Functions.LoadOptimizedImage("block_names.png");
block_surface_hours = M_Functions.LoadOptimizedImage("block_hours.png");
block_names_detected = M_Functions.LoadOptimizedImag("block_names_detected.png");
block_hours_detected = M_Functions.LoadOptimizedImag("block_hours_detected.png");
block_rect_names.x = x;
block_rect_names.y = y;
block_rect_names.w = block_surface_names -> w;
block_rect_names.h = block_surface_names -> h;
block_rect_hours.x = block_rect_names.x + block_rect_names.w;
block_rect_hours.y = block_rect_names.y;
block_rect_hours.w = block_surface_hours -> w;
block_rect_hours.h = block_surface_hours -> h;
}
//copy
Block::Block(const Block& source)
{
block_surface_names = source.block_surface_names;
block_surface_hours = source.block_surface_hours;
block_names_detected = source.block_names_detected;
block_hours_detected = source.block_hours_detected;
}
Block::~Block(){
//having this is necessary obviously- crashes program
//removing this causes the program not to crash
SDL_FreeSurface(block_surface_hours);
SDL_FreeSurface(block_surface_names);
SDL_FreeSurface(block_hours_detected);
SDL_FreeSurface(block_names_detected);
}
//where the object with SDL_FreeSurface() in the dtor is added to vector - crash!
void Control::HandleEvents(SDL_Event &event, MediaFunctions &M_Functions){
if(event.type == SDL_KEYDOWN){
if(event.key.keysym.sym == SDLK_a)
//append a block instance using copy constructor
BlockVector.push_back(Block (Block(100,100, M_Functions)));
}
}
'shared_ptr'?为什么要添加那么多开销?为什么不告诉他如何让'Block'移动? –
会有shared_ptr修复崩溃? – starhacker
@MooingDuck是可移动的,这里是个好主意 – marcinj