c++ - 删除指针导致内存泄漏？

Question

我正在使用运行时库 CRT 来检测内存泄漏。这是我在析构函数中发现的：

                    _CrtMemCheckpoint(&crtMemStateFinish);
nDifference = _CrtMemDifference(&crtMemStateDifference, &crtMemStateStart, &crtMemStateFinish);
sizeChange = crtMemStateFinish.lSizes - crtMemStateStart.lSizes;
if(nDifference > 0)
_CrtDumpMemoryLeaks();
nDifference = 0;
sizeChange = 0;
_CrtMemCheckpoint(&crtMemStateStart);


                delete[] ptr;
                ptr = NULL;

                    _CrtMemCheckpoint(&crtMemStateFinish);
nDifference = _CrtMemDifference(&crtMemStateDifference, &crtMemStateStart, &crtMemStateFinish);
sizeChange = crtMemStateFinish.lSizes - crtMemStateStart.lSizes;
if(nDifference > 0)
_CrtDumpMemoryLeaks();
nDifference = 0;
sizeChange = 0;
_CrtMemCheckpoint(&crtMemStateStart);

nDifference > 0，所以有内存泄漏，但没有说在哪里。

以下是 ptr 的声明和定义方式：

char ** ptr;

ptr = new char*[4];

有什么建议么？

Answer 1

您正在分配一个指针数组。您不仅必须删除数组，还必须删除数组中的每个指针。显然，您需要在删除数组之前执行此操作。