使用重载的展示位置new/delete来增强shared_ptr

Question

我正在使用boost shared_ptr和我自己的内存管理器这样的(剥离示例,我希望它没有错误):

class MemoryManager
{
public:
    /** Allocate some memory.*/
    inline void* allocate(size_t nbytes)
    {
        return malloc(nbytes);
    }
    /** Remove memory agian.*/
    inline void deallocate(void* p)
    {
        free(p);
    }


};

MemoryManager globalMM;

// New operators
inline void* operator new(size_t nbytes, ogl2d::MemoryManagerImpl& mm)
{
    return globalMM.allocate(nbytes);
}

// Corresponding delete operators
inline void operator delete(void *p, ogl2d::MemoryManagerImpl& mm)
{
    globalMM.deallocate(p);
}

/** Class for smart pointers, to ensure
     *  correct deletion by the memory manger.*/
class Deleter
{
public:
    void operator()(void *p) {
    globalMM.deallocate(p);
}
};

我这样使用它:

shared_ptr<Object>(new(globalMM) Object, Deleter);

但现在我意识到了.如果shared_ptr删除了我的onject,它会调用Deleter :: operator()并删除对象.但析构函数不会被调用...

我怎么能改变这个？

Answer 1

因为删除器应该销毁对象:

class Deleter
{
public:
   void operator()(Object *p) {
    p->~Object();
    globalMM.deallocate(p); 
   }
};

编辑:我的删除中错了,修复了