c++ - vector 指针导致 valgrind 内存泄漏

Question

我正在尝试学习 C++ 和 valgrind。所以我写了下面的代码来测试一下。但是我有一些内存泄漏。任何人都可以解释导致内存泄漏的原因吗？提前致谢。

#include <vector>
#include <iostream>
using namespace std;

class test
{
     int c;
      public:
      void whatever();
}; 
void test:: whatever()
{
     vector<test*> a;
     if(true)
     {
           test* b = new test();
           b->c = 1;
           a.push_back(b);
     }
     test* d = a.back();
     cout << "prints: " << d->c;
     delete d;
}

int main()
{
    test* a = new test();
    a->whatever();
    return 1;
}

来自 valgrind

==28548== HEAP SUMMARY:
==28548==     in use at exit: 4 bytes in 1 blocks
==28548==   total heap usage: 3 allocs, 2 frees, 16 bytes allocated
==28548==
==28548== 4 bytes in 1 blocks are definitely lost in loss record 1 of 1
==28548==    at 0x4C27CC1: operator new(unsigned long) (vg_replace_malloc.c:261)
==28548==    by 0x400C36: main (in a.out)
==28548==
==28548== LEAK SUMMARY:
==28548==    definitely lost: 4 bytes in 1 blocks
==28548==    indirectly lost: 0 bytes in 0 blocks
==28548==      possibly lost: 0 bytes in 0 blocks
==28548==    still reachable: 0 bytes in 0 blocks
==28548==         suppressed: 0 bytes in 0 blocks
==28548==
==28548== For counts of detected and suppressed errors, rerun with: -v
==28548== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 4 from 4)

我是否不允许从指针的拷贝中删除，还是我做错了什么？

Answer 1

你永远不会在 a 上调用 delete。

当然，这里重要的一点是您正在使用指针的 vector。你到底为什么要这样做？让 vector 为您管理内存!