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split those files in util/
some more renaming
This commit is contained in:
Benoit Jacob
186
Eigen/src/Core/util/Meta.h
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186
Eigen/src/Core/util/Meta.h
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// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra. Eigen itself is part of the KDE project.
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//
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// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
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// Copyright (C) 2006-2008 Benoit Jacob <jacob@math.jussieu.fr>
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//
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// Eigen 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 3 of the License, or (at your option) any later version.
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//
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// Alternatively, you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of
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// the License, or (at your option) any later version.
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//
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// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
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// GNU 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 and a copy of the GNU General Public License along with
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// Eigen. If not, see <http://www.gnu.org/licenses/>.
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#ifndef EIGEN_META_H
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#define EIGEN_META_H
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// just a workaround because GCC seems to not really like empty structs
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#ifdef __GNUG__
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struct ei_empty_struct{char _ei_dummy_;};
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#define EIGEN_EMPTY_STRUCT : Eigen::ei_empty_struct
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#else
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#define EIGEN_EMPTY_STRUCT
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#endif
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//classes inheriting ei_no_assignment_operator don't generate a default operator=.
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class ei_no_assignment_operator
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{
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private:
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ei_no_assignment_operator& operator=(const ei_no_assignment_operator&);
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};
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template<int Value> class ei_int_if_dynamic EIGEN_EMPTY_STRUCT
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{
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public:
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ei_int_if_dynamic() {}
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explicit ei_int_if_dynamic(int) {}
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static int value() { return Value; }
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void setValue(int) {}
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};
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template<> class ei_int_if_dynamic<Dynamic>
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{
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int m_value;
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ei_int_if_dynamic() {}
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public:
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explicit ei_int_if_dynamic(int value) : m_value(value) {}
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int value() const { return m_value; }
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void setValue(int value) { m_value = value; }
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};
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template <bool Condition, class Then, class Else>
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struct ei_meta_if { typedef Then ret; };
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template <class Then, class Else>
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struct ei_meta_if <false, Then, Else> { typedef Else ret; };
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template<typename T, typename U> struct ei_is_same_type { enum { ret = 0 }; };
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template<typename T> struct ei_is_same_type<T,T> { enum { ret = 1 }; };
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/** \internal
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* Convenient struct to get the result type of a unary or binary functor.
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*
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* It supports both the current STL mechanism (using the result_type member) as well as
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* upcoming next STL generation (using a templated result member).
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* If none of these members is provided, then the type of the first argument is returned.
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*/
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template<typename T> struct ei_result_of {};
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struct ei_has_none {int a[1];};
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struct ei_has_std_result_type {int a[2];};
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struct ei_has_tr1_result {int a[3];};
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template<typename Func, typename ArgType, int SizeOf=sizeof(ei_has_none)>
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struct ei_unary_result_of_select {typedef ArgType type;};
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template<typename Func, typename ArgType>
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struct ei_unary_result_of_select<Func, ArgType, sizeof(ei_has_std_result_type)> {typedef typename Func::result_type type;};
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template<typename Func, typename ArgType>
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struct ei_unary_result_of_select<Func, ArgType, sizeof(ei_has_tr1_result)> {typedef typename Func::template result<Func(ArgType)>::type type;};
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template<typename Func, typename ArgType>
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struct ei_result_of<Func(ArgType)> {
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template<typename T>
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static ei_has_std_result_type testFunctor(T const *, typename T::result_type const * = 0);
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template<typename T>
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static ei_has_tr1_result testFunctor(T const *, typename T::template result<T(ArgType)>::type const * = 0);
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static ei_has_none testFunctor(...);
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// note that the following indirection is needed for gcc-3.3
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enum {FunctorType = sizeof(testFunctor(static_cast<Func*>(0)))};
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typedef typename ei_unary_result_of_select<Func, ArgType, FunctorType>::type type;
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};
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template<typename Func, typename ArgType0, typename ArgType1, int SizeOf=sizeof(ei_has_none)>
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struct ei_binary_result_of_select {typedef ArgType0 type;};
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template<typename Func, typename ArgType0, typename ArgType1>
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struct ei_binary_result_of_select<Func, ArgType0, ArgType1, sizeof(ei_has_std_result_type)>
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{typedef typename Func::result_type type;};
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template<typename Func, typename ArgType0, typename ArgType1>
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struct ei_binary_result_of_select<Func, ArgType0, ArgType1, sizeof(ei_has_tr1_result)>
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{typedef typename Func::template result<Func(ArgType0,ArgType1)>::type type;};
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template<typename Func, typename ArgType0, typename ArgType1>
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struct ei_result_of<Func(ArgType0,ArgType1)> {
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template<typename T>
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static ei_has_std_result_type testFunctor(T const *, typename T::result_type const * = 0);
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template<typename T>
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static ei_has_tr1_result testFunctor(T const *, typename T::template result<T(ArgType0,ArgType1)>::type const * = 0);
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static ei_has_none testFunctor(...);
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// note that the following indirection is needed for gcc-3.3
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enum {FunctorType = sizeof(testFunctor(static_cast<Func*>(0)))};
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typedef typename ei_binary_result_of_select<Func, ArgType0, ArgType1, FunctorType>::type type;
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};
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template<typename T> struct ei_eval
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{
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typedef Matrix<typename ei_traits<T>::Scalar,
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ei_traits<T>::RowsAtCompileTime,
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ei_traits<T>::ColsAtCompileTime,
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ei_traits<T>::Flags & ~(EvalBeforeNestingBit | EvalBeforeAssigningBit),
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ei_traits<T>::MaxRowsAtCompileTime,
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ei_traits<T>::MaxColsAtCompileTime> type;
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};
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template<typename T> struct ei_unref { typedef T type; };
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template<typename T> struct ei_unref<T&> { typedef T type; };
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template<typename T> struct ei_is_temporary
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{
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enum { ret = 0 };
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};
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template<typename T> struct ei_is_temporary<Temporary<T> >
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{
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enum { ret = 1 };
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};
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template<typename T, int n=1> struct ei_nested
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{
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typedef typename ei_meta_if<
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ei_is_temporary<T>::ret,
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T,
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typename ei_meta_if<
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ei_traits<T>::Flags & EvalBeforeNestingBit
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|| (n+1) * NumTraits<typename ei_traits<T>::Scalar>::ReadCost < (n-1) * T::CoeffReadCost,
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typename ei_eval<T>::type,
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const T&
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>::ret
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>::ret type;
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};
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template<typename T> struct ei_functor_traits
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{
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enum
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{
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Cost = 10,
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IsVectorizable = false
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};
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};
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template<typename T> struct ei_packet_traits
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{
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typedef T type;
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enum {size=1};
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};
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#endif // EIGEN_META_H
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