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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef EIGEN_CXX11_TENSOR_TENSOR_INDEX_LIST_H
#define EIGEN_CXX11_TENSOR_TENSOR_INDEX_LIST_H
#if __cplusplus > 199711L
namespace Eigen {
/** \internal
*
* \class TensorIndexList
* \ingroup CXX11_Tensor_Module
*
* \brief Set of classes used to encode a set of Tensor dimensions/indices.
*
* The indices in the list can be known at compile time or at runtime. A mix
* of static and dynamic indices can also be provided if needed. The tensor
* code will attempt to take advantage of the indices that are known at
* compile time to optimize the code it generates.
*
* This functionality requires a c++11 compliant compiler. If your compiler
* is older you need to use arrays of indices instead.
*
* Several examples are provided in the cxx11_tensor_index_list.cpp file.
*
* \sa Tensor
*/
template <DenseIndex n>
struct type2index {
static const DenseIndex value = n;
constexpr operator DenseIndex() const { return n; }
void set(DenseIndex val) {
eigen_assert(val == n);
}
};
namespace internal {
template <typename T>
void update_value(T& val, DenseIndex new_val) {
val = new_val;
}
template <DenseIndex n>
void update_value(type2index<n>& val, DenseIndex new_val) {
val.set(new_val);
}
template <typename T>
struct is_compile_time_constant {
static constexpr bool value = false;
};
template <DenseIndex idx>
struct is_compile_time_constant<type2index<idx> > {
static constexpr bool value = true;
};
template <DenseIndex idx>
struct is_compile_time_constant<const type2index<idx> > {
static constexpr bool value = true;
};
template <DenseIndex idx>
struct is_compile_time_constant<type2index<idx>& > {
static constexpr bool value = true;
};
template <DenseIndex idx>
struct is_compile_time_constant<const type2index<idx>& > {
static constexpr bool value = true;
};
template <DenseIndex Idx>
struct tuple_coeff {
template <typename... T>
static constexpr DenseIndex get(const DenseIndex i, const std::tuple<T...>& t) {
return std::get<Idx>(t) * (i == Idx) + tuple_coeff<Idx-1>::get(i, t) * (i != Idx);
}
template <typename... T>
static void set(const DenseIndex i, std::tuple<T...>& t, const DenseIndex value) {
if (i == Idx) {
update_value(std::get<Idx>(t), value);
} else {
tuple_coeff<Idx-1>::set(i, t, value);
}
}
template <typename... T>
static constexpr bool value_known_statically(const DenseIndex i, const std::tuple<T...>& t) {
return ((i == Idx) & is_compile_time_constant<typename std::tuple_element<Idx, std::tuple<T...> >::type>::value) ||
tuple_coeff<Idx-1>::value_known_statically(i, t);
}
};
template <>
struct tuple_coeff<0> {
template <typename... T>
static constexpr DenseIndex get(const DenseIndex i, const std::tuple<T...>& t) {
// eigen_assert (i == 0); // gcc fails to compile assertions in constexpr
return std::get<0>(t) * (i == 0);
}
template <typename... T>
static void set(const DenseIndex i, std::tuple<T...>& t, const DenseIndex value) {
eigen_assert (i == 0);
update_value(std::get<0>(t), value);
}
template <typename... T>
static constexpr bool value_known_statically(const DenseIndex i, const std::tuple<T...>& t) {
// eigen_assert (i == 0); // gcc fails to compile assertions in constexpr
return is_compile_time_constant<typename std::tuple_element<0, std::tuple<T...> >::type>::value & (i == 0);
}
};
} // namespace internal
template<typename FirstType, typename... OtherTypes>
struct IndexList : std::tuple<FirstType, OtherTypes...> {
EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC constexpr DenseIndex operator[] (const DenseIndex i) const {
return internal::tuple_coeff<std::tuple_size<std::tuple<FirstType, OtherTypes...> >::value-1>::get(i, *this);
}
EIGEN_STRONG_INLINE EIGEN_DEVICE_FUNC void set(const DenseIndex i, const DenseIndex value) {
return internal::tuple_coeff<std::tuple_size<std::tuple<FirstType, OtherTypes...> >::value-1>::set(i, *this, value);
}
constexpr IndexList(const std::tuple<FirstType, OtherTypes...>& other) : std::tuple<FirstType, OtherTypes...>(other) { }
constexpr IndexList() : std::tuple<FirstType, OtherTypes...>() { }
constexpr bool value_known_statically(const DenseIndex i) const {
return internal::tuple_coeff<std::tuple_size<std::tuple<FirstType, OtherTypes...> >::value-1>::value_known_statically(i, *this);
}
};
template<typename FirstType, typename... OtherTypes>
constexpr IndexList<FirstType, OtherTypes...> make_index_list(FirstType val1, OtherTypes... other_vals) {
return std::make_tuple(val1, other_vals...);
}
namespace internal {
template<typename FirstType, typename... OtherTypes> struct array_size<IndexList<FirstType, OtherTypes...> > {
static const size_t value = std::tuple_size<std::tuple<FirstType, OtherTypes...> >::value;
};
template<typename FirstType, typename... OtherTypes> struct array_size<const IndexList<FirstType, OtherTypes...> > {
static const size_t value = std::tuple_size<std::tuple<FirstType, OtherTypes...> >::value;
};
template<DenseIndex n, typename FirstType, typename... OtherTypes> constexpr DenseIndex array_get(IndexList<FirstType, OtherTypes...>& a) {
return std::get<n>(a);
}
template<DenseIndex n, typename FirstType, typename... OtherTypes> constexpr DenseIndex array_get(const IndexList<FirstType, OtherTypes...>& a) {
return std::get<n>(a);
}
template <typename T>
struct index_known_statically {
constexpr bool operator() (DenseIndex) const {
return false;
}
};
template <typename FirstType, typename... OtherTypes>
struct index_known_statically<IndexList<FirstType, OtherTypes...> > {
constexpr bool operator() (const DenseIndex i) const {
return IndexList<FirstType, OtherTypes...>().value_known_statically(i);
}
};
template <typename FirstType, typename... OtherTypes>
struct index_known_statically<const IndexList<FirstType, OtherTypes...> > {
constexpr bool operator() (const DenseIndex i) const {
return IndexList<FirstType, OtherTypes...>().value_known_statically(i);
}
};
template <typename Tx>
struct index_statically_eq {
constexpr bool operator() (DenseIndex, DenseIndex) const {
return false;
}
};
template <typename FirstType, typename... OtherTypes>
struct index_statically_eq<IndexList<FirstType, OtherTypes...> > {
constexpr bool operator() (const DenseIndex i, const DenseIndex value) const {
return IndexList<FirstType, OtherTypes...>().value_known_statically(i) &
IndexList<FirstType, OtherTypes...>()[i] == value;
}
};
template <typename FirstType, typename... OtherTypes>
struct index_statically_eq<const IndexList<FirstType, OtherTypes...> > {
constexpr bool operator() (const DenseIndex i, const DenseIndex value) const {
return IndexList<FirstType, OtherTypes...>().value_known_statically(i) &
IndexList<FirstType, OtherTypes...>()[i] == value;
}
};
template <typename T>
struct index_statically_ne {
constexpr bool operator() (DenseIndex, DenseIndex) const {
return false;
}
};
template <typename FirstType, typename... OtherTypes>
struct index_statically_ne<IndexList<FirstType, OtherTypes...> > {
constexpr bool operator() (const DenseIndex i, const DenseIndex value) const {
return IndexList<FirstType, OtherTypes...>().value_known_statically(i) &
IndexList<FirstType, OtherTypes...>()[i] != value;
}
};
template <typename FirstType, typename... OtherTypes>
struct index_statically_ne<const IndexList<FirstType, OtherTypes...> > {
constexpr bool operator() (const DenseIndex i, const DenseIndex value) const {
return IndexList<FirstType, OtherTypes...>().value_known_statically(i) &
IndexList<FirstType, OtherTypes...>()[i] != value;
}
};
} // end namespace internal
} // end namespace Eigen
#else
namespace Eigen {
namespace internal {
// No C++11 support
template <typename T>
struct index_known_statically {
EIGEN_ALWAYS_INLINE EIGEN_DEVICE_FUNC bool operator() (DenseIndex) const{
return false;
}
};
template <typename T>
struct index_statically_eq {
EIGEN_ALWAYS_INLINE EIGEN_DEVICE_FUNC bool operator() (DenseIndex, DenseIndex) const{
return false;
}
};
template <typename T>
struct index_statically_ne {
EIGEN_ALWAYS_INLINE EIGEN_DEVICE_FUNC bool operator() (DenseIndex, DenseIndex) const{
return false;
}
};
} // end namespace internal
} // end namespace Eigen
#endif
#endif // EIGEN_CXX11_TENSOR_TENSOR_INDEX_LIST_H
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