QVector - check if iterators arguments are valid (in debugmode)

This adds a check of the iterator values in erase and insert.

Change-Id: I28e660153dbfc5f0054a5b25cba2c5725c678a81
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/tools/qvector.h

@@ -238,7 +238,10 @@ private:
     void defaultConstruct(T *from, T *to);
     void copyConstruct(const T *srcFrom, const T *srcTo, T *dstFrom);
     void destruct(T *from, T *to);
-
+    bool isValidIterator(const iterator &i) const
+    {
+        return (i <= d->end()) && (d->begin() <= i);
+    }
     class AlignmentDummy { Data header; T array[1]; };
 };
 
@@ -578,6 +581,8 @@ inline void QVector<T>::removeLast()
 template <typename T>
 typename QVector<T>::iterator QVector<T>::insert(iterator before, size_type n, const T &t)
 {
+    Q_ASSERT_X(isValidIterator(before),  "QVector::insert", "The specified iterator argument 'before' is invalid");
+
     int offset = std::distance(d->begin(), before);
     if (n != 0) {
         const T copy(t);
@@ -611,6 +616,9 @@ typename QVector<T>::iterator QVector<T>::insert(iterator before, size_type n, c
 template <typename T>
 typename QVector<T>::iterator QVector<T>::erase(iterator abegin, iterator aend)
 {
+    Q_ASSERT_X(isValidIterator(abegin), "QVector::erase", "The specified iterator argument 'abegin' is invalid");
+    Q_ASSERT_X(isValidIterator(aend), "QVector::erase", "The specified iterator argument 'aend' is invalid");
+
     const int itemsToErase = aend - abegin;
 
     if (!itemsToErase)

tests/manual/corelib/tools/qvector/main.cpp

@@ -0,0 +1,76 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Thorbjørn Lund Martsum - tmartsum[at]gmail.com
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QDebug>
+//#define QT_STRICT_ITERATORS
+#include <QVector>
+
+void testErase()
+{
+    QVector<int> a, b;
+    a.append(5);
+    a.append(6);
+    a.append(7);
+    b = a;
+    a.erase(a.begin());
+    a.erase(a.end() - 1);
+    qDebug() << "erase - no errors until now";
+    // a.erase(a.end());
+    a.erase(b.begin());
+}
+
+void testInsert()
+{
+    QVector<int> a, b;
+    a.insert(a.begin(), 1, 1);
+    a.insert(a.begin(), 1, 2);
+    a.insert(a.begin(), 1, 3);
+    b = a;
+    qDebug() << "insert - no errors until now";
+    a.insert(b.begin(), 1, 4);
+}
+
+int main()
+{
+    testErase();
+    // testInsert();
+    return 0;
+}

tests/manual/corelib/tools/qvector/main.pro

@@ -0,0 +1 @@
+SOURCES = main.cpp