c++ - 崩溃 : this may be due to a corruption of the heap

Question

我在我的插件中使用 qwt5 和 qgis 2.8.1((32 位版本)，它使用 qwt6)。当我运行我的 C++ 程序时，它崩溃并出现此错误:

问题出现在这个函数中(在debug中运行):

//delete all the items attached to QwtPlot
const QwtPlotItemList &list = m_pPlot->itemList ();
qDeleteAll(list.begin(), list.end());

我将此函数替换为:

QwtPlotItemIterator it = list.begin();
while ( it != list.end() )
{
  QwtPlotItem *item = *it;
  ++it; // increment before removing item from the list
  item->attach(NULL);
  delete item;
}

但在这条指令中再次发生同样的崩溃:

delete item;

请问，您对这个问题有什么想法吗？

Answer 1

来自 Qwt User's Guide

A QwtPlotItemList of all attached plot items.

Use caution when iterating these lists, as removing/detaching an item will invalidate the iterator. Instead you can place pointers to objects to be removed in a removal list, and traverse that list later.

强调我的。