delete-operator

问题 How do I call new operator with alignment? auto foo = new(std::align_val_t(32)) Foo; //? and then, how to delete it properly? delete(std::align_val_t(32), foo); //? If this is the right form of using these overloads, why valgring complaining about mismatched free()/delete/delete[]? 回答1: exist very basic principle - the memory free routine always must match to allocate routine. if we use mismatch allocate and free - run time behavior can be any: all can be random ok, or crash by run-time, or

问题 How do I call new operator with alignment? auto foo = new(std::align_val_t(32)) Foo; //? and then, how to delete it properly? delete(std::align_val_t(32), foo); //? If this is the right form of using these overloads, why valgring complaining about mismatched free()/delete/delete[]? 回答1: exist very basic principle - the memory free routine always must match to allocate routine. if we use mismatch allocate and free - run time behavior can be any: all can be random ok, or crash by run-time, or

问题 I was making a program for linked list in C++. To implement the concept, I created a pointer 'start' globally, pointing to the first element of the list. After completion of the program I tried to delete all memory allocated dynamically to prevent memory leaks, by accessing successive nodes using the start and another locally declared pointer 'p'. Here, I used a pointer pointing to the same correct addresses, but this pointer was not the one used for memory allocation, but was declared

问题 I'm trying to call explicit constructor/destructor with traits in templatized function. template <int i> struct Traits { }; template <> struct Traits<1> { typedef Foo type_t; }; template <> struct Traits<2> { typedef Bar type_t; }; template <class Traits> void DoSomething(void* p_in) { typename Traits::type_t* p = reinterpret_cast<typename Traits::type_t*>(p_in); // this works. new (p) typename Traits::type_t; // neither of following two does work. p->~typename Traits::type_t(); p->typename

问题 I need to free the bitpointer , because this function is executed multiple times and memory usage is growing for a reason I don't understand and it crashes after reaching 22mb of ram usage.. If I try to delete the bitpointer like this delete []bitpointer or free(bitpointer) I get access violation error. But I don't understand why, because the function shouldn't use the pointer any more and the new red blue green values are set.. void Get_Color(int x,int y,int w,int h,int &red,int &green,int

问题 I need to free the bitpointer , because this function is executed multiple times and memory usage is growing for a reason I don't understand and it crashes after reaching 22mb of ram usage.. If I try to delete the bitpointer like this delete []bitpointer or free(bitpointer) I get access violation error. But I don't understand why, because the function shouldn't use the pointer any more and the new red blue green values are set.. void Get_Color(int x,int y,int w,int h,int &red,int &green,int

问题 I need to free the bitpointer , because this function is executed multiple times and memory usage is growing for a reason I don't understand and it crashes after reaching 22mb of ram usage.. If I try to delete the bitpointer like this delete []bitpointer or free(bitpointer) I get access violation error. But I don't understand why, because the function shouldn't use the pointer any more and the new red blue green values are set.. void Get_Color(int x,int y,int w,int h,int &red,int &green,int

来源： https://stackoverflow.com/questions/21124917/delete-causing-heap-corruption

问题 I'm reading to brush up on C++ knowledge that is almost 2 decades old in order to understand online info on the factory pattern. The final usage context will likely be in a different 3rd generation language (3GL), but because of my past experience, I think it's easier to follow C++ than (say) Java, even though the latter may be less intricate in syntax. A bigger reason, however, is that the only code example I can find of the problem being addressed, i.e., in the absence of the factory

问题 I'm reading to brush up on C++ knowledge that is almost 2 decades old in order to understand online info on the factory pattern. The final usage context will likely be in a different 3rd generation language (3GL), but because of my past experience, I think it's easier to follow C++ than (say) Java, even though the latter may be less intricate in syntax. A bigger reason, however, is that the only code example I can find of the problem being addressed, i.e., in the absence of the factory