c++ - Valgrind 显示数据肯定在构造函数 c++ 中丢失

Question

我正在尝试使用 valgrind 调试我的程序以检查是否丢失了我的内存并希望修复段错误。 Valgrind 产生了以下输出，但是当我检查代码中的相应行时，valgrind 指向的行只是创建了一个新对象。这是部分valgrind 提示的程序:

相关的 valgrind 输出:

--13598-- REDIR: 0x36fd4803d0 (free) redirected to 0x4a074f0 (free)
==13598== 
==13598== HEAP SUMMARY:
==13598==     in use at exit: 168 bytes in 1 blocks
==13598==   total heap usage: 31 allocs, 31 frees, 1,108 bytes allocated
==13598== 
==13598== Searching for pointers to 1 not-freed blocks
==13598== Checked 188,824 bytes
==13598== 
==13598== 168 bytes in 1 blocks are definitely lost in loss record 1 of 1
==13598==    at 0x4A06965: operator new(unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
==13598==    by 0x400F94: MLH<int>::MLH() (MLH.h:50)
==13598==    by 0x400C71: main (Benchmark.cpp:23)
==13598== 
==13598== LEAK SUMMARY:
==13598==    definitely lost: 168 bytes in 1 blocks
==13598==    indirectly lost: 0 bytes in 0 blocks
==13598==      possibly lost: 0 bytes in 0 blocks
==13598==    still reachable: 0 bytes in 0 blocks
==13598==         suppressed: 0 bytes in 0 blocks
==13598== 
==13598== ERROR SUMMARY: 7 errors from 5 contexts (suppressed: 2 from 2)

MLH.h:

template <typename T>
MLH<T>::MLH()
{
  proot = new HashNode<T>();
}

哈希节点.h

template< typename T >
HashNode< T >::HashNode()
{
  for(int i=0; i<5; i++){
    keyArray[i] = -1;
    dataArray[i] = NULL;
    childArray[i] = NULL;
    //levelsArray[i] = 0;
  }
  for(int j = 0; j<9; j++ ){
    levelsArray[j] = 0;
  }
  levelsArray[0] = 1;
  numElements = 0;
  numChildren = 0;
  nodeLevel = 0;
  stemNode = 0;
  steps = 0;

  MLH_print_option = 0;
}

template <typename T>
MLH::~MLH()
{
    //delete proot
    for (int i=0; i< 5; i++) {
        if(proot->childArray[i] != NULL){
            delete proot->childArray[i];
        }
    }
}

我看到问题是在我尝试初始化 HashNode 对象时被调用，但这对我来说没有意义。有什么我没看到的吗？

Answer 1

template <typename T>
MLH::~MLH()
{
    //delete proot
    for (int i=0; i< 5; i++) {
        if(proot->childArray[i] != NULL){
            delete proot->childArray[i];
        }
    }
}

我看到了上面的一些问题:

• 您正在删除 proot->childArray 的元素，但您没有删除 proot 本身。这是你的泄密。
• 没有必要进行 null 测试。只需删除它。将 delete 应用于空指针不会执行任何操作。
• 为什么这个函数在文件 HashNode.h 中？