vector_expressions.h

Go to the documentation of this file.

/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */



#ifndef LASS_GUARDIAN_OF_INCLUSION_NUM_IMPL_VECTOR_EXPRESSIONS_H
#define LASS_GUARDIAN_OF_INCLUSION_NUM_IMPL_VECTOR_EXPRESSIONS_H

#include "../num_common.h"

namespace lass
{
namespace num
{
namespace impl
{

template <typename T>
class VStorage
{
public:
    enum { lvalue = true };
    typedef typename util::CallTraits<T>::TValue TValue;
    typedef typename util::CallTraits<T>::TParam TParam;
    typedef typename util::CallTraits<T>::TReference TReference;
    typedef typename util::CallTraits<T>::TConstReference TConstReference;
    typedef size_t TSize;

    VStorage(): storage_() {}
    VStorage(TSize iSize, TParam iInitialValue): storage_(iSize, iInitialValue) {}
    TReference operator[](TSize iIndex) { LASS_ASSERT(iIndex < size()); return storage_[iIndex]; }
    TConstReference operator[](TSize iIndex) const { LASS_ASSERT(iIndex < size()); return storage_[iIndex]; }
    TSize size() const { return storage_.size(); }

    // special VStorage members:
    //
    void resize(TSize iSize) { storage_.resize(iSize, T()); }
    void swap(VStorage<T>& iOther) { storage_.swap(iOther.storage_); }
private:
    std::vector<T> storage_;
};

/** @internal
 */
template <typename T>
class VScalar
{
public:
    enum { lvalue = false };
    typedef typename util::CallTraits<T>::TValue TValue;
    typedef typename util::CallTraits<T>::TParam TParam;
    typedef size_t TSize;

    VScalar(TSize iSize, TParam iValue): value_(iValue), size_(iSize) {}
    TParam operator[](TSize iIndex) const { LASS_ASSERT(iIndex < size_); return value_; }
    TSize size() const { return size_; }
private:
    TValue value_;
    TSize size_;
};



/** @internal
 */
template <typename ExpressionType>
struct VectorExpressionTraits
{
    typedef const ExpressionType& TStorage;
};

/** @internal
 */
template <typename T>
struct VectorExpressionTraits<VScalar<T> >
{
    typedef VScalar<T> TStorage;
};



/** @internal
 */
#define LASS_NUM_VECTOR_BINARY_EXPRESSION(i_name, c_operator)\
template <typename T, typename Operand1, typename Operand2>\
class LASS_CONCATENATE(V, i_name)\
{\
public:\
    enum { lvalue = false };\
    typedef typename util::CallTraits<T>::TValue TValue;\
    typedef size_t TSize;\
    LASS_CONCATENATE(V, i_name)(const Operand1& iA, const Operand2& iB):\
        operand1_(iA), operand2_(iB)\
    {\
        LASS_ASSERT(operand1_.size() == operand2_.size());\
    }\
    TValue operator[](TSize iIndex) const { return operand1_[iIndex] c_operator operand2_[iIndex]; }\
    TSize size() const { return operand1_.size(); }\
private:\
    typename VectorExpressionTraits<Operand1>::TStorage operand1_;\
    typename VectorExpressionTraits<Operand2>::TStorage operand2_;\
}

LASS_NUM_VECTOR_BINARY_EXPRESSION(Add, +);
LASS_NUM_VECTOR_BINARY_EXPRESSION(Sub, -);
LASS_NUM_VECTOR_BINARY_EXPRESSION(Mul, *);
LASS_NUM_VECTOR_BINARY_EXPRESSION(Div, /);



/** @internal
 */
#define LASS_NUM_VECTOR_UNARY_EXPRESSION(i_name, c_operator)\
template <typename T, typename Operand1>\
class LASS_CONCATENATE(V, i_name)\
{\
public:\
    enum { lvalue = false };\
    typedef typename util::CallTraits<T>::TValue TValue;\
    typedef size_t TSize;\
    LASS_CONCATENATE(V, i_name)(const Operand1& iA): operand1_(iA) {}\
    TValue operator[](TSize iIndex) const { return c_operator operand1_[iIndex]; }\
    TSize size() const { return operand1_.size(); }\
private:\
    typename VectorExpressionTraits<Operand1>::TStorage operand1_;\
}

LASS_NUM_VECTOR_UNARY_EXPRESSION(Neg, -);
LASS_NUM_VECTOR_UNARY_EXPRESSION(Rec, ::lass::num::NumTraits<T>::one /);



/** @internal
 */
template <typename T, typename Operand1>
class VFun
{
public:
    enum { lvalue = false };
    typedef T (*TOperator)(T);
    typedef typename util::CallTraits<T>::TValue TValue;
    typedef size_t TSize;
    VFun(const Operand1& iA, TOperator iOperator): operand1_(iA), operator_(iOperator) {}
    TValue operator[](TSize iIndex) const { return operator_(operand1_[iIndex]); }
    TSize size() const { return operand1_.size(); }
private:
    typename VectorExpressionTraits<Operand1>::TStorage operand1_;
    TOperator operator_;
};




}

}

}

#endif

// EOF