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Diffstat (limited to 'src/corelib/doc/snippets/code/src_corelib_kernel_qdeadlinetimer.cpp')
-rw-r--r-- | src/corelib/doc/snippets/code/src_corelib_kernel_qdeadlinetimer.cpp | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/corelib/doc/snippets/code/src_corelib_kernel_qdeadlinetimer.cpp b/src/corelib/doc/snippets/code/src_corelib_kernel_qdeadlinetimer.cpp new file mode 100644 index 0000000000..35c06f842e --- /dev/null +++ b/src/corelib/doc/snippets/code/src_corelib_kernel_qdeadlinetimer.cpp @@ -0,0 +1,134 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** 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 executeOperation(int msecs) + { + QDeadlineTimer deadline(msecs); + do { + if (readFromDevice(deadline.remainingTime()) + break; + waitForReadyRead(deadline); + } while (!deadline.hasExpired()); + } +//! [0] + +//! [1] + using namespace std::chrono; + using namespace std::chrono_literals; + + QDeadlineTimer deadline(30s); + device->waitForReadyRead(deadline); + if (deadline.remainingTime<nanoseconds>() > 300ms) + cleanup(); +//! [1] + +//! [2] + using namespace std::chrono; + using namespace std::chrono_literals; + auto now = steady_clock::now(); + QDeadlineTimer deadline(now + 1s); + Q_ASSERT(deadline == now + 1s); +//! [2] + +//! [3] + using namespace std::chrono_literals; + QDeadlineTimer deadline(250ms); +//! [3] + +//! [4] + using namespace std::chrono_literals; + deadline.setRemainingTime(250ms); +//! [4] + +//! [5] + mutex.tryLock(deadline.remainingTime()); +//! [5] + +//! [6] + qint64 realTimeLeft = deadline.deadline(); + if (realTimeLeft != (std::numeric_limits<qint64>::max)()) { + realTimeLeft -= QDeadlineTimer::current().deadline(); + // or: + //QElapsedTimer timer; + //timer.start(); + //realTimeLeft -= timer.msecsSinceReference(); + } +//! [6] + +//! [7] + qint64 realTimeLeft = deadline.deadlineNSecs(); + if (realTimeLeft != std::numeric_limits<qint64>::max()) + realTimeLeft -= QDeadlineTimer::current().deadlineNSecs(); +//! [7] + +//! [8] + return d1.deadlineNSecs() == d2.deadlineNSecs(); +//! [8] + +//! [9] + return d1.deadlineNSecs() != d2.deadlineNSecs(); +//! [9] + +//! [10] + return d1.deadlineNSecs() < d2.deadlineNSecs(); +//! [10] + +//! [11] + return d1.deadlineNSecs() <= d2.deadlineNSecs(); +//! [11] + +//! [12] + return d1.deadlineNSecs() > d2.deadlineNSecs(); +//! [12] + +//! [13] + return d1.deadlineNSecs() >= d2.deadlineNSecs(); +//! [13] |