当“新”和“新”时，Valgrind抱怨“绝对会失去记忆”。 “删除”不在同一个功能中

Question

我在valgrind报告中收到此错误。

  

== 31766 = = 1个街区中的8个字节肯定会在825的损失记录3中丢失

我的代码如下：

struct FooList {
  FooList() {}
  FooList(const vector<Foo*>& fooList_): fooList(fooList_) {}
  ~FooList() {
      BOOST_FOREACH(Foo* fooPtr, fooList) {
        delete fooPtr;
      }
  }  
  vector<Foo*> fooList;
}

Foo* createFoo(bool flag)
{
  if(flag) return new FooDerivedA();
  else     return new FooDerivedB();
}

void main() 
{
  FooList fl;

  Foo* fooA = createFoo(true);
  // some manipulation on fooA, if an exception happens at this point, the memory leaks.
  fl.fooList.push_back(fooA);

  Foo* fooB = createFoo(false);
  // some manipulation on fooB, if an exception happens at this point, the memory leaks.
  fl.fooList.push_back(fooB);

  // fl's desctructor will release memory for all elements.
}

我不确定是否因为new和delete语句不在导致definitely lost的同一函数中。我该如何解决这个问题？