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Diffstat (limited to 'src/corelib/tools/qvarlengtharray.h')
| -rw-r--r-- | src/corelib/tools/qvarlengtharray.h | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/src/corelib/tools/qvarlengtharray.h b/src/corelib/tools/qvarlengtharray.h new file mode 100644 index 0000000..e2f60ed --- /dev/null +++ b/src/corelib/tools/qvarlengtharray.h @@ -0,0 +1,238 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, 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. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QVARLENGTHARRAY_H +#define QVARLENGTHARRAY_H + +#include <QtCore/qcontainerfwd.h> +#include <QtCore/qglobal.h> +#include <new> + +QT_BEGIN_HEADER + +QT_BEGIN_NAMESPACE + +QT_MODULE(Core) + +// Prealloc = 256 by default, specified in qcontainerfwd.h +template<class T, int Prealloc> +class QVarLengthArray +{ +public: + inline explicit QVarLengthArray(int size = 0); + + inline QVarLengthArray(const QVarLengthArray<T, Prealloc> &other) + : a(Prealloc), s(0), ptr(reinterpret_cast<T *>(array)) + { + append(other.constData(), other.size()); + } + + inline ~QVarLengthArray() { + if (QTypeInfo<T>::isComplex) { + T *i = ptr + s; + while (i-- != ptr) + i->~T(); + } + if (ptr != reinterpret_cast<T *>(array)) + qFree(ptr); + } + inline QVarLengthArray<T, Prealloc> &operator=(const QVarLengthArray<T, Prealloc> &other) + { + if (this != &other) { + clear(); + append(other.constData(), other.size()); + } + return *this; + } + + inline void removeLast() { + Q_ASSERT(s > 0); + realloc(s - 1, a); + } + inline int size() const { return s; } + inline int count() const { return s; } + inline bool isEmpty() const { return (s == 0); } + inline void resize(int size); + inline void clear() { resize(0); } + + inline int capacity() const { return a; } + inline void reserve(int size); + + inline T &operator[](int idx) { + Q_ASSERT(idx >= 0 && idx < s); + return ptr[idx]; + } + inline const T &operator[](int idx) const { + Q_ASSERT(idx >= 0 && idx < s); + return ptr[idx]; + } + + inline void append(const T &t) { + if (s == a) // i.e. s != 0 + realloc(s, s<<1); + const int idx = s++; + if (QTypeInfo<T>::isComplex) { + new (ptr + idx) T(t); + } else { + ptr[idx] = t; + } + } + void append(const T *buf, int size); + + inline T *data() { return ptr; } + inline const T *data() const { return ptr; } + inline const T * constData() const { return ptr; } + +private: + void realloc(int size, int alloc); + + int a; + int s; + T *ptr; + union { + // ### Qt 5: Use 'Prealloc * sizeof(T)' as array size + char array[sizeof(qint64) * (((Prealloc * sizeof(T)) / sizeof(qint64)) + 1)]; + qint64 q_for_alignment_1; + double q_for_alignment_2; + }; +}; + +template <class T, int Prealloc> +Q_INLINE_TEMPLATE QVarLengthArray<T, Prealloc>::QVarLengthArray(int asize) + : s(asize) { + if (s > Prealloc) { + ptr = reinterpret_cast<T *>(qMalloc(s * sizeof(T))); + a = s; + } else { + ptr = reinterpret_cast<T *>(array); + a = Prealloc; + } + if (QTypeInfo<T>::isComplex) { + T *i = ptr + s; + while (i != ptr) + new (--i) T; + } +} + +template <class T, int Prealloc> +Q_INLINE_TEMPLATE void QVarLengthArray<T, Prealloc>::resize(int asize) +{ realloc(asize, qMax(asize, a)); } + +template <class T, int Prealloc> +Q_INLINE_TEMPLATE void QVarLengthArray<T, Prealloc>::reserve(int asize) +{ if (asize > a) realloc(s, asize); } + +template <class T, int Prealloc> +Q_OUTOFLINE_TEMPLATE void QVarLengthArray<T, Prealloc>::append(const T *abuf, int asize) +{ + Q_ASSERT(abuf); + if (asize <= 0) + return; + + const int idx = s; + const int news = s + asize; + if (news >= a) + realloc(s, qMax(s<<1, news)); + s = news; + + if (QTypeInfo<T>::isComplex) { + T *i = ptr + idx; + T *j = i + asize; + while (i < j) + new (i++) T(*abuf++); + } else { + qMemCopy(&ptr[idx], abuf, asize * sizeof(T)); + } +} + +template <class T, int Prealloc> +Q_OUTOFLINE_TEMPLATE void QVarLengthArray<T, Prealloc>::realloc(int asize, int aalloc) +{ + Q_ASSERT(aalloc >= asize); + T *oldPtr = ptr; + int osize = s; + s = asize; + + if (aalloc != a) { + ptr = reinterpret_cast<T *>(qMalloc(aalloc * sizeof(T))); + if (ptr) { + a = aalloc; + + if (QTypeInfo<T>::isStatic) { + T *i = ptr + osize; + T *j = oldPtr + osize; + while (i != ptr) { + new (--i) T(*--j); + j->~T(); + } + } else { + qMemCopy(ptr, oldPtr, osize * sizeof(T)); + } + } else { + ptr = oldPtr; + s = 0; + asize = 0; + } + } + + if (QTypeInfo<T>::isComplex) { + if (asize < osize) { + T *i = oldPtr + osize; + T *j = oldPtr + asize; + while (i-- != j) + i->~T(); + } else { + T *i = ptr + asize; + T *j = ptr + osize; + while (i != j) + new (--i) T; + } + } + + if (oldPtr != reinterpret_cast<T *>(array) && oldPtr != ptr) + qFree(oldPtr); +} + +QT_END_NAMESPACE + +QT_END_HEADER + +#endif // QVARLENGTHARRAY_H |