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Copy constructor : faster memcpy instead of slow 'for' cycle 

empty constructor
This commit is contained in:
Paolo Cignoni 2006-08-23 15:24:45 +00:00
parent 30c32f2445
commit 6cc1fb0753
1 changed files with 25 additions and 2 deletions
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27
vcg/math/matrix.h
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@ -22,6 +22,9 @@
****************************************************************************/ ****************************************************************************/
/*************************************************************************** /***************************************************************************
$Log: not supported by cvs2svn $ $Log: not supported by cvs2svn $
Revision 1.7 2006/04/29 10:26:04 fiorin
Added some utility methods (swapping of columns and rows, matrix-vector multiplication)
Revision 1.6 2006/04/11 08:09:35 zifnab1974 Revision 1.6 2006/04/11 08:09:35 zifnab1974
changes necessary for gcc 3.4.5 on linux 64bit. Please take note of case-sensitivity of filenames changes necessary for gcc 3.4.5 on linux 64bit. Please take note of case-sensitivity of filenames
@ -30,6 +33,11 @@ added diagonal matrix, outer produce and namespace
***************************************************************************/ ***************************************************************************/
// marco
// Copy constructor : memcpy instead of 'for' cycle
// empty constructor
#ifndef MATRIX_VCGLIB #ifndef MATRIX_VCGLIB
#define MATRIX_VCGLIB #define MATRIX_VCGLIB
@ -106,6 +114,17 @@ namespace vcg{
// _data[i] = values[i]; // _data[i] = values[i];
}; };
/*!
* Empty constructor
* Just create the object
*/
Matrix()
{
_rows = 0;
_columns = 0;
_data = NULL;
};
/*! /*!
* Copy constructor * Copy constructor
* The matrix elements are initialized with the value of the corresponding element in \i m * The matrix elements are initialized with the value of the corresponding element in \i m
@ -116,8 +135,12 @@ namespace vcg{
_rows = m._rows; _rows = m._rows;
_columns = m._columns; _columns = m._columns;
_data = new ScalarType[_rows*_columns]; _data = new ScalarType[_rows*_columns];
for (unsigned int i=0; i<_rows*_columns; i++)
_data[i] = m._data[i]; unsigned int dim = _rows * _columns;
memcpy(_data, m._data, dim * sizeof(ScalarType));
// for (unsigned int i=0; i<_rows*_columns; i++)
// _data[i] = m._data[i];
}; };
/*! /*!