diff options
author | Sérgio Martins <sergio.martins@kdab.com> | 2017-09-24 20:45:09 +0100 |
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committer | Simon Hausmann <simon.hausmann@qt.io> | 2018-07-21 17:47:35 +0000 |
commit | 9229452e574e603aa86fd5adb28da33cf5879db9 (patch) | |
tree | 6cd8f36cb60a438377f07519c3e01cf6aad95ba8 /src/corelib/doc | |
parent | 89bca67499c6316ef63c9d788c5508ce6a79b27c (diff) |
Introduce QScopeGuard
A RAII style class which calls a function at end of scope.
Example usage:
auto cleanup = qScopeGuard([] { <my cleanup code> ; });
[ChangeLog][QtCore] Introduced QScopeGuard.
Task-number: QTBUG-62894
Change-Id: Ife67f5c76255a1fafbae03367263da0bac9a0070
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
Diffstat (limited to 'src/corelib/doc')
-rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_tools_qscopeguard.cpp | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_tools_qscopeguard.cpp b/src/corelib/doc/snippets/code/src_corelib_tools_qscopeguard.cpp new file mode 100644 index 0000000000..c8c5f694c6 --- /dev/null +++ b/src/corelib/doc/snippets/code/src_corelib_tools_qscopeguard.cpp @@ -0,0 +1,67 @@ +/**************************************************************************** +** +** Copyright (C) 2018 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Sérgio Martins <sergio.martins@kdab.com> +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the documentation of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:BSD$ +** 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 The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** BSD License Usage +** Alternatively, you may use this file under the terms of the BSD license +** as follows: +** +** "Redistribution and use in source and binary forms, with or without +** modification, are permitted provided that the following conditions are +** met: +** * Redistributions of source code must retain the above copyright +** notice, this list of conditions and the following disclaimer. +** * Redistributions in binary form must reproduce the above copyright +** notice, this list of conditions and the following disclaimer in +** the documentation and/or other materials provided with the +** distribution. +** * Neither the name of The Qt Company Ltd nor the names of its +** contributors may be used to endorse or promote products derived +** from this software without specific prior written permission. +** +** +** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +void myComplexCodeWithMultipleReturnPoints(int v) +{ + // The lambda will be executed right before your function returns + auto cleanup = qScopeGuard([] { code you want executed goes HERE; }); + + if (v == -1) + return; + + int v2 = code_that_might_through_exceptions(); + + if (v2 == -1) + return; + + (...) +} +//! [0] |