| -rw-r--r-- | qmake/tools/qbitarray.cpp | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/qmake/tools/qbitarray.cpp b/qmake/tools/qbitarray.cpp index 4f4e14b..1aaf963 100644 --- a/qmake/tools/qbitarray.cpp +++ b/qmake/tools/qbitarray.cpp @@ -136,129 +136,130 @@ /*! Constructs an empty bit array. */ QBitArray::QBitArray() : QByteArray( 0, 0 ) { bitarr_data *x = new bitarr_data; Q_CHECK_PTR( x ); x->nbits = 0; setSharedBlock( x ); } /*! Constructs a bit array of \a size bits. The bits are uninitialized. \sa fill() */ QBitArray::QBitArray( uint size ) : QByteArray( 0, 0 ) { bitarr_data *x = new bitarr_data; Q_CHECK_PTR( x ); x->nbits = 0; setSharedBlock( x ); resize( size ); } /*! \fn QBitArray::QBitArray( const QBitArray &a ) Constructs a shallow copy of \a a. */ /*! \fn QBitArray &QBitArray::operator=( const QBitArray &a ) Assigns a shallow copy of \a a to this bit array and returns a reference to this array. */ /*! Pad last byte with 0-bits. */ void QBitArray::pad0() { uint sz = size(); if ( sz && sz%8 ) *(data()+sz/8) &= (1 << (sz%8)) - 1; } /*! \fn uint QBitArray::size() const Returns the bit array's size (number of bits). \sa resize() */ /*! Resizes the bit array to \a size bits and returns TRUE if the bit - array could be resized; otherwise returns FALSE. + array could be resized; otherwise returns FALSE. The array becomes + a null array if \a size == 0. If the array is expanded, the new bits are set to 0. \sa size() */ bool QBitArray::resize( uint size ) { uint s = this->size(); if ( !QByteArray::resize( (size+7)/8 ) ) return FALSE; // cannot resize SHBLOCK->nbits = size; if ( size != 0 ) { // not null array int ds = (int)(size+7)/8 - (int)(s+7)/8;// number of bytes difference if ( ds > 0 ) // expanding array memset( data() + (s+7)/8, 0, ds ); // reset new data } return TRUE; } /*! Fills the bit array with \a v (1's if \a v is TRUE, or 0's if \a v is FALSE). fill() resizes the bit array to \a size bits if \a size is nonnegative. Returns FALSE if a nonnegative \e size was specified and the bit array could not be resized; otherwise returns TRUE. \sa resize() */ bool QBitArray::fill( bool v, int size ) { if ( size >= 0 ) { // resize first if ( !resize( size ) ) return FALSE; // cannot resize } else { size = this->size(); } if ( size > 0 ) memset( data(), v ? 0xff : 0, (size + 7) / 8 ); if ( v ) pad0(); return TRUE; } /*! Detaches from shared bit array data and makes sure that this bit array is the only one referring to the data. If multiple bit arrays share common data, this bit array dereferences the data and gets a copy of the data. Nothing happens if there is only a single reference. \sa copy() */ void QBitArray::detach() { int nbits = SHBLOCK->nbits; |