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EmulateArray.h
1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2014 Benoit Steiner <benoit.steiner.goog@gmail.com>
5//
6// This Source Code Form is subject to the terms of the Mozilla
7// Public License v. 2.0. If a copy of the MPL was not distributed
8// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9
10#ifndef EIGEN_EMULATE_ARRAY_H
11#define EIGEN_EMULATE_ARRAY_H
12
13
14
15// The array class is only available starting with cxx11. Emulate our own here
16// if needed. Beware, msvc still doesn't advertise itself as a c++11 compiler!
17// Moreover, CUDA doesn't support the STL containers, so we use our own instead.
18#if (__cplusplus <= 199711L && EIGEN_COMP_MSVC < 1900) || defined(EIGEN_GPUCC) || defined(EIGEN_AVOID_STL_ARRAY)
19
20namespace Eigen {
21template <typename T, size_t n> class array {
22 public:
23 EIGEN_DEVICE_FUNC
24 EIGEN_STRONG_INLINE T& operator[] (size_t index) { eigen_internal_assert(index < size()); return values[index]; }
25 EIGEN_DEVICE_FUNC
26 EIGEN_STRONG_INLINE const T& operator[] (size_t index) const { eigen_internal_assert(index < size()); return values[index]; }
27
28 EIGEN_DEVICE_FUNC
29 EIGEN_STRONG_INLINE T& at(size_t index) { eigen_assert(index < size()); return values[index]; }
30 EIGEN_DEVICE_FUNC
31 EIGEN_STRONG_INLINE const T& at(size_t index) const { eigen_assert(index < size()); return values[index]; }
32
33 EIGEN_DEVICE_FUNC
34 EIGEN_STRONG_INLINE T& front() { return values[0]; }
35 EIGEN_DEVICE_FUNC
36 EIGEN_STRONG_INLINE const T& front() const { return values[0]; }
37
38 EIGEN_DEVICE_FUNC
39 EIGEN_STRONG_INLINE T& back() { return values[n-1]; }
40 EIGEN_DEVICE_FUNC
41 EIGEN_STRONG_INLINE const T& back() const { return values[n-1]; }
42
43 EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE
44 static std::size_t size() { return n; }
45
46 T values[n];
47
48 EIGEN_DEVICE_FUNC
49 EIGEN_STRONG_INLINE array() { }
50 EIGEN_DEVICE_FUNC
51 EIGEN_STRONG_INLINE array(const T& v) {
52 EIGEN_STATIC_ASSERT(n==1, YOU_MADE_A_PROGRAMMING_MISTAKE)
53 values[0] = v;
54 }
55 EIGEN_DEVICE_FUNC
56 EIGEN_STRONG_INLINE array(const T& v1, const T& v2) {
57 EIGEN_STATIC_ASSERT(n==2, YOU_MADE_A_PROGRAMMING_MISTAKE)
58 values[0] = v1;
59 values[1] = v2;
60 }
61 EIGEN_DEVICE_FUNC
62 EIGEN_STRONG_INLINE array(const T& v1, const T& v2, const T& v3) {
63 EIGEN_STATIC_ASSERT(n==3, YOU_MADE_A_PROGRAMMING_MISTAKE)
64 values[0] = v1;
65 values[1] = v2;
66 values[2] = v3;
67 }
68 EIGEN_DEVICE_FUNC
69 EIGEN_STRONG_INLINE array(const T& v1, const T& v2, const T& v3,
70 const T& v4) {
71 EIGEN_STATIC_ASSERT(n==4, YOU_MADE_A_PROGRAMMING_MISTAKE)
72 values[0] = v1;
73 values[1] = v2;
74 values[2] = v3;
75 values[3] = v4;
76 }
77 EIGEN_DEVICE_FUNC
78 EIGEN_STRONG_INLINE array(const T& v1, const T& v2, const T& v3, const T& v4,
79 const T& v5) {
80 EIGEN_STATIC_ASSERT(n==5, YOU_MADE_A_PROGRAMMING_MISTAKE)
81 values[0] = v1;
82 values[1] = v2;
83 values[2] = v3;
84 values[3] = v4;
85 values[4] = v5;
86 }
87 EIGEN_DEVICE_FUNC
88 EIGEN_STRONG_INLINE array(const T& v1, const T& v2, const T& v3, const T& v4,
89 const T& v5, const T& v6) {
90 EIGEN_STATIC_ASSERT(n==6, YOU_MADE_A_PROGRAMMING_MISTAKE)
91 values[0] = v1;
92 values[1] = v2;
93 values[2] = v3;
94 values[3] = v4;
95 values[4] = v5;
96 values[5] = v6;
97 }
98 EIGEN_DEVICE_FUNC
99 EIGEN_STRONG_INLINE array(const T& v1, const T& v2, const T& v3, const T& v4,
100 const T& v5, const T& v6, const T& v7) {
101 EIGEN_STATIC_ASSERT(n==7, YOU_MADE_A_PROGRAMMING_MISTAKE)
102 values[0] = v1;
103 values[1] = v2;
104 values[2] = v3;
105 values[3] = v4;
106 values[4] = v5;
107 values[5] = v6;
108 values[6] = v7;
109 }
110 EIGEN_DEVICE_FUNC
111 EIGEN_STRONG_INLINE array(
112 const T& v1, const T& v2, const T& v3, const T& v4,
113 const T& v5, const T& v6, const T& v7, const T& v8) {
114 EIGEN_STATIC_ASSERT(n==8, YOU_MADE_A_PROGRAMMING_MISTAKE)
115 values[0] = v1;
116 values[1] = v2;
117 values[2] = v3;
118 values[3] = v4;
119 values[4] = v5;
120 values[5] = v6;
121 values[6] = v7;
122 values[7] = v8;
123 }
124
125#if EIGEN_HAS_VARIADIC_TEMPLATES
126 EIGEN_DEVICE_FUNC
127 EIGEN_STRONG_INLINE array(std::initializer_list<T> l) {
128 eigen_assert(l.size() == n);
129 internal::smart_copy(l.begin(), l.end(), values);
130 }
131#endif
132};
133
134
135// Specialize array for zero size
136template <typename T> class array<T, 0> {
137 public:
138 EIGEN_DEVICE_FUNC
139 EIGEN_STRONG_INLINE T& operator[] (size_t) {
140 eigen_assert(false && "Can't index a zero size array");
141 return dummy;
142 }
143 EIGEN_DEVICE_FUNC
144 EIGEN_STRONG_INLINE const T& operator[] (size_t) const {
145 eigen_assert(false && "Can't index a zero size array");
146 return dummy;
147 }
148
149 EIGEN_DEVICE_FUNC
150 EIGEN_STRONG_INLINE T& front() {
151 eigen_assert(false && "Can't index a zero size array");
152 return dummy;
153 }
154 EIGEN_DEVICE_FUNC
155 EIGEN_STRONG_INLINE const T& front() const {
156 eigen_assert(false && "Can't index a zero size array");
157 return dummy;
158 }
159 EIGEN_DEVICE_FUNC
160 EIGEN_STRONG_INLINE T& back() {
161 eigen_assert(false && "Can't index a zero size array");
162 return dummy;
163 }
164 EIGEN_DEVICE_FUNC
165 EIGEN_STRONG_INLINE const T& back() const {
166 eigen_assert(false && "Can't index a zero size array");
167 return dummy;
168 }
169
170 static EIGEN_DEVICE_FUNC EIGEN_ALWAYS_INLINE std::size_t size() { return 0; }
171
172 EIGEN_DEVICE_FUNC
173 EIGEN_STRONG_INLINE array() : dummy() { }
174
175#if EIGEN_HAS_VARIADIC_TEMPLATES
176 EIGEN_DEVICE_FUNC array(std::initializer_list<T> l) : dummy() {
177 EIGEN_UNUSED_VARIABLE(l);
178 eigen_assert(l.size() == 0);
179 }
180#endif
181
182 private:
183 T dummy;
184};
185
186// Comparison operator
187// Todo: implement !=, <, <=, >, and >=
188template<class T, std::size_t N>
189EIGEN_DEVICE_FUNC bool operator==(const array<T,N>& lhs, const array<T,N>& rhs) {
190 for (std::size_t i = 0; i < N; ++i) {
191 if (lhs[i] != rhs[i]) {
192 return false;
193 }
194 }
195 return true;
196}
197
198
199namespace internal {
200template<std::size_t I_, class T, std::size_t N>
201EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE T& array_get(array<T,N>& a) {
202 return a[I_];
203}
204template<std::size_t I_, class T, std::size_t N>
205EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE const T& array_get(const array<T,N>& a) {
206 return a[I_];
207}
208
209template<class T, std::size_t N> struct array_size<array<T,N> > {
210 enum { value = N };
211};
212template<class T, std::size_t N> struct array_size<array<T,N>& > {
213 enum { value = N };
214};
215template<class T, std::size_t N> struct array_size<const array<T,N> > {
216 enum { value = N };
217};
218template<class T, std::size_t N> struct array_size<const array<T,N>& > {
219 enum { value = N };
220};
221
222} // end namespace internal
223} // end namespace Eigen
224
225#else
226
227// The compiler supports c++11, and we're not targeting cuda: use std::array as Eigen::array
228#include <array>
229namespace Eigen {
230
231template <typename T, std::size_t N> using array = std::array<T, N>;
232
233namespace internal {
234/* std::get is only constexpr in C++14, not yet in C++11
235 * - libstdc++ from version 4.7 onwards has it nevertheless,
236 * so use that
237 * - libstdc++ older versions: use _M_instance directly
238 * - libc++ all versions so far: use __elems_ directly
239 * - all other libs: use std::get to be portable, but
240 * this may not be constexpr
241 */
242#if defined(__GLIBCXX__) && __GLIBCXX__ < 20120322
243#define STD_GET_ARR_HACK a._M_instance[I_]
244#elif defined(_LIBCPP_VERSION)
245#define STD_GET_ARR_HACK a.__elems_[I_]
246#else
247#define STD_GET_ARR_HACK std::template get<I_, T, N>(a)
248#endif
249
250template<std::size_t I_, class T, std::size_t N> constexpr inline T& array_get(std::array<T,N>& a) { return (T&) STD_GET_ARR_HACK; }
251template<std::size_t I_, class T, std::size_t N> constexpr inline T&& array_get(std::array<T,N>&& a) { return (T&&) STD_GET_ARR_HACK; }
252template<std::size_t I_, class T, std::size_t N> constexpr inline T const& array_get(std::array<T,N> const& a) { return (T const&) STD_GET_ARR_HACK; }
253
254#undef STD_GET_ARR_HACK
255
256} // end namespace internal
257} // end namespace Eigen
258
259#endif
260
261#endif // EIGEN_EMULATE_ARRAY_H
Namespace containing all symbols from the Eigen library.