131 lines
4.0 KiB
C++
131 lines
4.0 KiB
C++
/* This file is part of Eigen, a C++ template library for linear algebra
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* Copyright (C) 2007 Benoit Jacob <jacob@math.jussieu.fr>
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*
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* Based on Tvmet source code, http://tvmet.sourceforge.net,
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* Copyright (C) 2001 - 2003 Olaf Petzold <opetzold@users.sourceforge.net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: CommaInitializer.h,v 1.14 2005/03/02 12:14:22 opetzold Exp $
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*/
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#ifndef TVMET_COMMA_INITIALIZER_H
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#define TVMET_COMMA_INITIALIZER_H
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#include <tvmet/CompileTimeError.h>
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namespace tvmet {
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/**
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* \class CommaInitializer CommaInitializer.h "tvmet/CommaInitializer.h"
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* \brief Initialize classes using a comma separated lists.
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*
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* The comma operator is called when it appears next to an object of
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* the type the comma is defined for. However, "operator," is not called
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* for function argument lists, only for objects that are out in the open,
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* separated by commas (Thinking C++
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* <a href=http://www.ida.liu.se/~TDDA14/online/v1ticpp/Chapter12.html>
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* Ch.12: Operator comma</a>).
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*
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* This implementation uses the same technique as described in Todd Veldhuizen
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* Techniques for Scientific C++
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* <a href=http://extreme.indiana.edu/~tveldhui/papers/techniques/techniques01.html#l43>
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* chapter 1.11 Comma overloading</a>.
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*
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* The initializer list is avaible after instanciation of the object,
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* therefore use it like:
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* \code
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* vector3d t;
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* t = 1.0, 2.0, 3.0;
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* \endcode
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* It's evaluated to (((t = 1.0), 2.0), 3.0)
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*
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* For matrizes the initilization is done row wise.
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*
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* If the comma separted list of values longer then the size of the vector
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* or matrix a compile time error will occour. Otherwise the pending values
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* will be written random into the memory.
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*
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*/
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template<typename Obj, int LEN>
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class CommaInitializer
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{
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typedef typename Obj::value_type value_type;
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/**
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* \class Initializer
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* \brief Helper fo recursive overloaded comma operator.
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*/
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template<int N> class Initializer
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{
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Initializer();
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Initializer& operator=(const Initializer&);
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public:
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Initializer(Obj& obj, int index) : m_obj(obj), m_index(index) {}
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/** Overloads the comma operator for recursive assign values from comma
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separated list. */
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Initializer<N+1> operator,(value_type rhs)
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{
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TVMET_CT_CONDITION(N < LEN, CommaInitializerList_is_too_long)
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m_obj.commaWrite(m_index, rhs);
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return Initializer<N+1>(m_obj, m_index+1);
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}
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private:
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Obj& m_obj;
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int m_index;
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};
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public:
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CommaInitializer(const CommaInitializer& rhs)
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: m_object(rhs.m_object),
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m_data(rhs.m_data)
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{}
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/** Constructor used by Vector or Matrix operator(value_type rhs) */
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CommaInitializer(Obj& obj, value_type x)
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: m_object(obj),
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m_data(x)
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{}
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/** Destructor, does nothing. */
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~CommaInitializer() {}
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/** Overloaded comma operator, called only once for the first occoured comma. This
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means the first value is assigned by %operator=() and the 2nd value after the
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comma. Therefore we call the %Initializer::operator,() for the list starting
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after the 2nd. */
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Initializer<2> operator,(value_type rhs)
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{
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m_object.commaWrite(0, m_data);
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m_object.commaWrite(1, rhs);
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return Initializer<2>(m_object, 2);
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}
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private:
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Obj& m_object;
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value_type m_data;
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};
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} // namespace tvmet
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#endif // TVMET_COMMA_INITIALIZER_H
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// Local Variables:
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// mode:C++
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// End:
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