diff -r 000000000000 -r 1918ee327afb doc/src/snippets/code/doc_src_q3memarray.qdoc --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/doc/src/snippets/code/doc_src_q3memarray.qdoc Mon Jan 11 14:00:40 2010 +0000 @@ -0,0 +1,121 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the documentation 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 Technology Preview License Agreement accompanying +** this package. +** +** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +//! [0] +#include +#include + +Q3MemArray fib( int num ) // returns fibonacci array +{ + Q_ASSERT( num > 2 ); + Q3MemArray f( num ); // array of ints + + f[0] = f[1] = 1; + for ( int i = 2; i < num; i++ ) + f[i] = f[i-1] + f[i-2]; + + return f; +} + +int main() +{ + Q3MemArray a = fib( 6 ); // get first 6 fibonaccis + for ( int i = 0; i < a.size(); i++ ) + qDebug( "%d: %d", i, a[i] ); + + qDebug( "1 is found %d times", a.contains(1) ); + qDebug( "5 is found at index %d", a.find(5) ); + + return 0; +} +//! [0] + + +//! [1] +0: 1 +1: 1 +2: 2 +3: 3 +4: 5 +5: 8 +1 is found 2 times +5 is found at index 4 +//! [1] + + +//! [2] +// MyStruct may be padded to 4 or 8 bytes +struct MyStruct +{ + short i; // 2 bytes + char c; // 1 byte +}; + +Q3MemArray a(1); +a[0].i = 5; +a[0].c = 't'; + +MyStruct x; +x.i = '5'; +x.c = 't'; +int i = a.find( x ); // may return -1 if the pad bytes differ +//! [2] + + +//! [3] +static char bindata[] = { 231, 1, 44, ... }; +QByteArray a; +a.setRawData( bindata, sizeof(bindata) ); // a points to bindata +QDataStream s( a, IO_ReadOnly ); // open on a's data +s >> ; // read raw bindata +a.resetRawData( bindata, sizeof(bindata) ); // finished +//! [3] + + +//! [4] +static char bindata[] = { 231, 1, 44, ... }; +QByteArray a, b; +a.setRawData( bindata, sizeof(bindata) ); // a points to bindata +a.resize( 8 ); // will crash +b = a; // will crash +a[2] = 123; // might crash +// forget to resetRawData: will crash +//! [4]