diff options
Diffstat (limited to 'doc/src/snippets/code/src_corelib_global_qglobal.cpp')
| -rw-r--r-- | doc/src/snippets/code/src_corelib_global_qglobal.cpp | 585 |
1 files changed, 0 insertions, 585 deletions
diff --git a/doc/src/snippets/code/src_corelib_global_qglobal.cpp b/doc/src/snippets/code/src_corelib_global_qglobal.cpp deleted file mode 100644 index 16f6783a52..0000000000 --- a/doc/src/snippets/code/src_corelib_global_qglobal.cpp +++ /dev/null @@ -1,585 +0,0 @@ -/**************************************************************************** -** -** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). -** Contact: http://www.qt-project.org/ -** -** This file is part of the documentation of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:BSD$ -** 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 Nokia Corporation and its Subsidiary(-ies) 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] -label->setAlignment(Qt::AlignLeft | Qt::AlignTop); -//! [0] - - -//! [1] -class MyClass -{ -public: - enum Option { - NoOptions = 0x0, - ShowTabs = 0x1, - ShowAll = 0x2, - SqueezeBlank = 0x4 - }; - Q_DECLARE_FLAGS(Options, Option) - ... -}; - -Q_DECLARE_OPERATORS_FOR_FLAGS(MyClass::Options) -//! [1] - -//! [meta-object flags] -Q_FLAGS(Options) -//! [meta-object flags] - -//! [2] -typedef QFlags<Enum> Flags; -//! [2] - - -//! [3] -int myValue = 10; -int minValue = 2; -int maxValue = 6; - -int boundedValue = qBound(minValue, myValue, maxValue); -// boundedValue == 6 -//! [3] - - -//! [4] -if (!driver()->isOpen() || driver()->isOpenError()) { - qWarning("QSqlQuery::exec: database not open"); - return false; -} -//! [4] - - -//! [5] -qint64 value = Q_INT64_C(932838457459459); -//! [5] - - -//! [6] -quint64 value = Q_UINT64_C(932838457459459); -//! [6] - - -//! [7] -void myMsgHandler(QtMsgType, const char *); -//! [7] - - -//! [8] -qint64 value = Q_INT64_C(932838457459459); -//! [8] - - -//! [9] -quint64 value = Q_UINT64_C(932838457459459); -//! [9] - - -//! [10] -int absoluteValue; -int myValue = -4; - -absoluteValue = qAbs(myValue); -// absoluteValue == 4 -//! [10] - - -//! [11] -qreal valueA = 2.3; -qreal valueB = 2.7; - -int roundedValueA = qRound(valueA); -// roundedValueA = 2 -int roundedValueB = qRound(valueB); -// roundedValueB = 3 -//! [11] - - -//! [12] -qreal valueA = 42949672960.3; -qreal valueB = 42949672960.7; - -int roundedValueA = qRound(valueA); -// roundedValueA = 42949672960 -int roundedValueB = qRound(valueB); -// roundedValueB = 42949672961 -//! [12] - - -//! [13] -int myValue = 6; -int yourValue = 4; - -int minValue = qMin(myValue, yourValue); -// minValue == yourValue -//! [13] - - -//! [14] -int myValue = 6; -int yourValue = 4; - -int maxValue = qMax(myValue, yourValue); -// maxValue == myValue -//! [14] - - -//! [15] -int myValue = 10; -int minValue = 2; -int maxValue = 6; - -int boundedValue = qBound(minValue, myValue, maxValue); -// boundedValue == 6 -//! [15] - - -//! [16] -#if QT_VERSION >= 0x040100 - QIcon icon = style()->standardIcon(QStyle::SP_TrashIcon); -#else - QPixmap pixmap = style()->standardPixmap(QStyle::SP_TrashIcon); - QIcon icon(pixmap); -#endif -//! [16] - - -//! [17] -// File: div.cpp - -#include <QtGlobal> - -int divide(int a, int b) -{ - Q_ASSERT(b != 0); - return a / b; -} -//! [17] - - -//! [18] -ASSERT: "b == 0" in file div.cpp, line 7 -//! [18] - - -//! [19] -// File: div.cpp - -#include <QtGlobal> - -int divide(int a, int b) -{ - Q_ASSERT_X(b != 0, "divide", "division by zero"); - return a / b; -} -//! [19] - - -//! [20] -ASSERT failure in divide: "division by zero", file div.cpp, line 7 -//! [20] - - -//! [21] -int *a; - -Q_CHECK_PTR(a = new int[80]); // WRONG! - -a = new (nothrow) int[80]; // Right -Q_CHECK_PTR(a); -//! [21] - - -//! [22] -template<typename TInputType> -const TInputType &myMin(const TInputType &value1, const TInputType &value2) -{ - qDebug() << Q_FUNC_INFO << "was called with value1:" << value1 << "value2:" << value2; - - if(value1 < value2) - return value1; - else - return value2; -} -//! [22] - - -//! [23] -#include <qapplication.h> -#include <stdio.h> -#include <stdlib.h> - -void myMessageOutput(QtMsgType type, const QMessageLogContext &context, const char *msg) -{ - switch (type) { - case QtDebugMsg: - fprintf(stderr, "Debug: %s (%s:%u, %s)\n", msg, context.file, context.line, context.function); - break; - case QtWarningMsg: - fprintf(stderr, "Warning: %s (%s:%u, %s)\n", msg, context.file, context.line, context.function); - break; - case QtCriticalMsg: - fprintf(stderr, "Critical: %s (%s:%u, %s)\n", msg, context.file, context.line, context.function); - break; - case QtFatalMsg: - fprintf(stderr, "Fatal: %s (%s:%u, %s)\n", msg, context.file, context.line, context.function); - abort(); - } -} - -int main(int argc, char **argv) -{ - qInstallMessageHandler(myMessageOutput); - QApplication app(argc, argv); - ... - return app.exec(); -} -//! [23] - - -//! [24] -qDebug("Items in list: %d", myList.size()); -//! [24] - - -//! [25] -qDebug() << "Brush:" << myQBrush << "Other value:" << i; -//! [25] - - -//! [26] -void f(int c) -{ - if (c > 200) - qWarning("f: bad argument, c == %d", c); -} -//! [26] - - -//! [27] -qWarning() << "Brush:" << myQBrush << "Other value:" -<< i; -//! [27] - - -//! [28] -void load(const QString &fileName) -{ - QFile file(fileName); - if (!file.exists()) - qCritical("File '%s' does not exist!", qPrintable(fileName)); -} -//! [28] - - -//! [29] -qCritical() << "Brush:" << myQBrush << "Other -value:" << i; -//! [29] - - -//! [30] -int divide(int a, int b) -{ - if (b == 0) // program error - qFatal("divide: cannot divide by zero"); - return a / b; -} -//! [30] - - -//! [31] -forever { - ... -} -//! [31] - - -//! [32] -CONFIG += no_keywords -//! [32] - - -//! [33] -CONFIG += no_keywords -//! [33] - - -//! [34] -QString FriendlyConversation::greeting(int type) -{ -static const char *greeting_strings[] = { - QT_TR_NOOP("Hello"), - QT_TR_NOOP("Goodbye") -}; -return tr(greeting_strings[type]); -} -//! [34] - - -//! [35] -static const char *greeting_strings[] = { - QT_TRANSLATE_NOOP("FriendlyConversation", "Hello"), - QT_TRANSLATE_NOOP("FriendlyConversation", "Goodbye") -}; - -QString FriendlyConversation::greeting(int type) -{ - return tr(greeting_strings[type]); -} - -QString global_greeting(int type) -{ - return qApp->translate("FriendlyConversation", - greeting_strings[type]); -} -//! [35] - - -//! [36] - -static { const char *source; const char *comment; } greeting_strings[] = -{ - QT_TRANSLATE_NOOP3("FriendlyConversation", "Hello", - "A really friendly hello"), - QT_TRANSLATE_NOOP3("FriendlyConversation", "Goodbye", - "A really friendly goodbye") -}; - -QString FriendlyConversation::greeting(int type) -{ - return tr(greeting_strings[type].source, - greeting_strings[type].comment); -} - -QString global_greeting(int type) -{ - return qApp->translate("FriendlyConversation", - greeting_strings[type].source, - greeting_strings[type].comment); -} -//! [36] - - -//! [qttrid] - //% "%n fooish bar(s) found.\n" - //% "Do you want to continue?" - QString text = qtTrId("qtn_foo_bar", n); -//! [qttrid] - - -//! [qttrid_noop] -static const char * const ids[] = { - //% "This is the first text." - QT_TRID_NOOP("qtn_1st_text"), - //% "This is the second text." - QT_TRID_NOOP("qtn_2nd_text"), - 0 -}; - -void TheClass::addLabels() -{ - for (int i = 0; ids[i]; ++i) - new QLabel(qtTrId(ids[i]), this); -} -//! [qttrid_noop] - - -//! [37] -qWarning("%s: %s", qPrintable(key), qPrintable(value)); -//! [37] - - -//! [38] -struct Point2D -{ - int x; - int y; -}; - -Q_DECLARE_TYPEINFO(Point2D, Q_PRIMITIVE_TYPE); -//! [38] - - -//! [39] -class Point2D -{ -public: - Point2D() { data = new int[2]; } - Point2D(const Point2D &other) { ... } - ~Point2D() { delete[] data; } - - Point2D &operator=(const Point2D &other) { ... } - - int x() const { return data[0]; } - int y() const { return data[1]; } - -private: - int *data; -}; - -Q_DECLARE_TYPEINFO(Point2D, Q_MOVABLE_TYPE); -//! [39] - - -//! [40] -#if Q_BYTE_ORDER == Q_BIG_ENDIAN -... -#endif - -or - -#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN -... -#endif - -//! [40] - - -//! [41] - -#if Q_BYTE_ORDER == Q_LITTLE_ENDIAN -... -#endif - -//! [41] - - -//! [42] -#if Q_BYTE_ORDER == Q_BIG_ENDIAN -... -#endif - -//! [42] - -//! [begin namespace macro] -namespace QT_NAMESPACE { -//! [begin namespace macro] - -//! [end namespace macro] -} -//! [end namespace macro] - -//! [43] -class MyClass : public QObject -{ - - private: - Q_DISABLE_COPY(MyClass) -}; - -//! [43] - -//! [44] -class MyClass : public QObject -{ - - private: - MyClass(const MyClass &); - MyClass &operator=(const MyClass &); -}; -//! [44] - -//! [45] - QWidget w = QWidget(); -//! [45] - -//! [46] - // Instead of comparing with 0.0 - qFuzzyCompare(0.0,1.0e-200); // This will return false - // Compare adding 1 to both values will fix the problem - qFuzzyCompare(1 + 0.0, 1 + 1.0e-200); // This will return true -//! [46] - -//! [47] -CApaApplication *myApplicationFactory(); -//! [47] - - -//! [49] -void myMessageHandler(QtMsgType, const QMessageLogContext &, const char *); -//! [49] - -//! [qlikely] - // the condition inside the "if" will be successful most of the times - for (int i = 1; i <= 365; i++) { - if (Q_LIKELY(isWorkingDay(i))) { - ... - } - ... - } -//! [qlikely] - -//! [qunlikely] -bool readConfiguration(const QFile &file) -{ - // We expect to be asked to read an existing file - if (Q_UNLIKELY(!file.exists())) { - qWarning() << "File not found"; - return false; - } - - ... - return true; -} -//! [qunlikely] - -//! [qunreachable-enum] - enum Shapes { - Rectangle, - Triangle, - Circle, - NumShapes - }; -//! [qunreachable-enum] - -//! [qunreachable-switch] - switch (shape) { - case Rectangle: - return rectangle(); - case Triangle: - return triangle(); - case Circle: - return circle(); - case NumShapes: - Q_UNREACHABLE(); - break; - } -//! [qunreachable-switch] |