133 lines
4.2 KiB
C++
133 lines
4.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qstringbuilder.h"
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#include <QtCore/qtextcodec.h>
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QT_BEGIN_NAMESPACE
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/*!
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\class QStringBuilder
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\internal
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\reentrant
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\since 4.6
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\brief The QStringBuilder class is a template class that provides a facility to build up QStrings from smaller chunks.
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\ingroup tools
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\ingroup shared
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\ingroup string-processing
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To build a QString by multiple concatenations, QString::operator+()
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is typically used. This causes \e{n - 1} reallocations when building
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a string from \e{n} chunks.
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QStringBuilder uses expression templates to collect the individual
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chunks, compute the total size, allocate the required amount of
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memory for the final QString object, and copy the chunks into the
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allocated memory.
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The QStringBuilder class is not to be used explicitly in user
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code. Instances of the class are created as return values of the
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operator%() function, acting on objects of type QString,
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QLatin1String, QStringRef, QChar, QCharRef,
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QLatin1Char, and \c char.
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Concatenating strings with operator%() generally yields better
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performance then using \c QString::operator+() on the same chunks
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if there are three or more of them, and performs equally well in other
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cases.
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\sa QLatin1String, QString
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*/
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/*! \fn QStringBuilder::QStringBuilder(const A &a, const B &b)
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Constructs a QStringBuilder from \a a and \a b.
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*/
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/* \fn QStringBuilder::operator%(const A &a, const B &b)
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Returns a \c QStringBuilder object that is converted to a QString object
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when assigned to a variable of QString type or passed to a function that
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takes a QString parameter.
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This function is usable with arguments of type \c QString,
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\c QLatin1String, \c QStringRef,
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\c QChar, \c QCharRef, \c QLatin1Char, and \c char.
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*/
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/*! \fn QByteArray QStringBuilder::toLatin1() const
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Returns a Latin-1 representation of the string as a QByteArray. The
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returned byte array is undefined if the string contains non-Latin1
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characters.
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*/
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/*! \internal
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*/
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void QAbstractConcatenable::convertFromAscii(const char *a, int len, QChar *&out)
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{
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if (len == -1) {
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if (!a)
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return;
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while (*a)
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*out++ = QLatin1Char(*a++);
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} else {
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for (int i = 0; i < len; ++i)
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*out++ = QLatin1Char(a[i]);
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}
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}
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/*! \internal */
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void QAbstractConcatenable::convertToAscii(const QChar* a, int len, char*& out)
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{
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if (len == -1) {
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while (a->unicode())
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convertToLatin1(*a++, out);
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} else {
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for (int i = 0; i < len; ++i)
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convertToLatin1(a[i], out);
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}
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}
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QT_END_NAMESPACE
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