QMap迭代崩溃 [英] QMap iteration crash

问题描述

我在Windows 8.1上使用Qt 5.5。当我运行下面的代码，应用程序能够通过一次迭代，但崩溃的第二个。 100％可重复。 （复制/粘贴到Qt Creator实例并测试;它可能为您工作）。

I am using Qt 5.5 on Windows 8.1. When I run the code below, the application is able to get through one iteration, but crashes on the second one. 100% reproducible. (Copy/paste it into a Qt Creator instance and test; it might work for you).

#include <QCoreApplication>
#include <QDebug>
#include <utility>

using std::pair;

int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);
    QMap<QString, pair<QString, QString> > table_def = {
        {"alpha", {"INTEGER", "PRIMARY KEY"}},
        {"beta", {"VARCHAR", ""}},
        {"gamma", {"VARCHAR", ""}},
        {"delta", {"REAL", "DEFAULT 0"}},
        {"epsilon", {"INTEGER", ""}},
        {"zeta", {"INTEGER", ""}},
        {"eta", {"INTEGER", ""}},
        {"theta", {"INTEGER", ""}},
        {"iota", {"VARCHAR", ""}},
        {"kappa", {"INTEGER", "DEFAULT 0"}},
        {"lambda", {"INTEGER", "DEFAULT 0"}}
    };

    QMapIterator<QString, pair<QString, QString> > it(table_def);
    while (it.hasNext()) {
      it.next();
      const QString& col_name = it.key();
      qDebug() << col_name;
      const QString& col_type = it.value().first;
      qDebug() << col_type;
      const QString& extra_def = it.value().second;
      qDebug() << extra_def;
    }
    return a.exec();
}

我的Visual Studio调试器说：
未处理的异常在0x000000006904E394（Qt5Cored.dll）在helloqt.exe：0xC0000005：访问冲突读取位置0xFFFFFFFFFFFFFFFF。

如果它是任何相关，我在我的项目文件中添加了 DEFINES + = Q_COMPILER_INITIALIZER_LISTS ，以启用初始化列表的QContainers初始化。此外，如果我用 QPair 替换STL 对，应用程序在第一次迭代时崩溃。

If it is of any relevance, I added DEFINES += Q_COMPILER_INITIALIZER_LISTS in my project file to enable initialization of QContainers with initializer lists. Also, if I replace the STL pair with QPair, the application crashes at the first iteration.

我没有看到这个代码有什么问题。

I don't see anything wrong with this code. What could be happening?

推荐答案

这是我使用的编译器版本（VS 2013）中的一个已知错误。更新Visual Studio后，这个问题消失了。

This is a known bug in the version of compiler I was using (VS 2013). After updating Visual Studio this issue went away.

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