CXX11Meta.h
00001 // This file is part of Eigen, a lightweight C++ template library
00002 // for linear algebra.
00003 //
00004 // Copyright (C) 2013 Christian Seiler <christian@iwakd.de>
00005 //
00006 // This Source Code Form is subject to the terms of the Mozilla
00007 // Public License v. 2.0. If a copy of the MPL was not distributed
00008 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
00009 
00010 #ifndef EIGEN_CXX11META_H
00011 #define EIGEN_CXX11META_H
00012 
00013 #include <vector>
00014 #include "EmulateArray.h"
00015 
00016 // Emulate the cxx11 functionality that we need if the compiler doesn't support it.
00017 // Visual studio 2015 doesn't advertise itself as cxx11 compliant, although it
00018 // supports enough of the standard for our needs
00019 #if __cplusplus > 199711L || EIGEN_COMP_MSVC >= 1900
00020 
00021 #include "CXX11Workarounds.h"
00022 
00023 namespace Eigen {
00024 
00025 namespace internal {
00026 
00033 template<typename... tt>
00034 struct type_list { constexpr static int count = sizeof...(tt); };
00035 
00036 template<typename t, typename... tt>
00037 struct type_list<t, tt...> { constexpr static int count = sizeof...(tt) + 1; typedef t first_type; };
00038 
00039 template<typename T, T... nn>
00040 struct numeric_list { constexpr static std::size_t count = sizeof...(nn); };
00041 
00042 template<typename T, T n, T... nn>
00043 struct numeric_list<T, n, nn...> { constexpr static std::size_t count = sizeof...(nn) + 1; constexpr static T first_value = n; };
00044 
00045 /* numeric list constructors
00046  *
00047  * equivalencies:
00048  *     constructor                                              result
00049  *     typename gen_numeric_list<int, 5>::type                  numeric_list<int, 0,1,2,3,4>
00050  *     typename gen_numeric_list_reversed<int, 5>::type         numeric_list<int, 4,3,2,1,0>
00051  *     typename gen_numeric_list_swapped_pair<int, 5,1,2>::type numeric_list<int, 0,2,1,3,4>
00052  *     typename gen_numeric_list_repeated<int, 0, 5>::type      numeric_list<int, 0,0,0,0,0>
00053  */
00054 
00055 template<typename T, std::size_t n, T start = 0, T... ii> struct gen_numeric_list                     : gen_numeric_list<T, n-1, start, start + n-1, ii...> {};
00056 template<typename T, T start, T... ii>                    struct gen_numeric_list<T, 0, start, ii...> { typedef numeric_list<T, ii...> type; };
00057 
00058 template<typename T, std::size_t n, T start = 0, T... ii> struct gen_numeric_list_reversed                     : gen_numeric_list_reversed<T, n-1, start, ii..., start + n-1> {};
00059 template<typename T, T start, T... ii>                    struct gen_numeric_list_reversed<T, 0, start, ii...> { typedef numeric_list<T, ii...> type; };
00060 
00061 template<typename T, std::size_t n, T a, T b, T start = 0, T... ii> struct gen_numeric_list_swapped_pair                           : gen_numeric_list_swapped_pair<T, n-1, a, b, start, (start + n-1) == a ? b : ((start + n-1) == b ? a : (start + n-1)), ii...> {};
00062 template<typename T, T a, T b, T start, T... ii>                    struct gen_numeric_list_swapped_pair<T, 0, a, b, start, ii...> { typedef numeric_list<T, ii...> type; };
00063 
00064 template<typename T, std::size_t n, T V, T... nn> struct gen_numeric_list_repeated                 : gen_numeric_list_repeated<T, n-1, V, V, nn...> {};
00065 template<typename T, T V, T... nn>                struct gen_numeric_list_repeated<T, 0, V, nn...> { typedef numeric_list<T, nn...> type; };
00066 
00067 /* list manipulation: concatenate */
00068 
00069 template<class a, class b> struct concat;
00070 
00071 template<typename... as, typename... bs> struct concat<type_list<as...>,       type_list<bs...>>        { typedef type_list<as..., bs...> type; };
00072 template<typename T, T... as, T... bs>   struct concat<numeric_list<T, as...>, numeric_list<T, bs...> > { typedef numeric_list<T, as..., bs...> type; };
00073 
00074 template<typename... p> struct mconcat;
00075 template<typename a>                             struct mconcat<a>           { typedef a type; };
00076 template<typename a, typename b>                 struct mconcat<a, b>        : concat<a, b> {};
00077 template<typename a, typename b, typename... cs> struct mconcat<a, b, cs...> : concat<a, typename mconcat<b, cs...>::type> {};
00078 
00079 /* list manipulation: extract slices */
00080 
00081 template<int n, typename x> struct take;
00082 template<int n, typename a, typename... as> struct take<n, type_list<a, as...>> : concat<type_list<a>, typename take<n-1, type_list<as...>>::type> {};
00083 template<int n>                             struct take<n, type_list<>>         { typedef type_list<> type; };
00084 template<typename a, typename... as>        struct take<0, type_list<a, as...>> { typedef type_list<> type; };
00085 template<>                                  struct take<0, type_list<>>         { typedef type_list<> type; };
00086 
00087 template<typename T, int n, T a, T... as> struct take<n, numeric_list<T, a, as...>> : concat<numeric_list<T, a>, typename take<n-1, numeric_list<T, as...>>::type> {};
00088 template<typename T, int n>               struct take<n, numeric_list<T>>           { typedef numeric_list<T> type; };
00089 template<typename T, T a, T... as>        struct take<0, numeric_list<T, a, as...>> { typedef numeric_list<T> type; };
00090 template<typename T>                      struct take<0, numeric_list<T>>           { typedef numeric_list<T> type; };
00091 
00092 template<typename T, int n, T... ii>      struct h_skip_helper_numeric;
00093 template<typename T, int n, T i, T... ii> struct h_skip_helper_numeric<T, n, i, ii...> : h_skip_helper_numeric<T, n-1, ii...> {};
00094 template<typename T, T i, T... ii>        struct h_skip_helper_numeric<T, 0, i, ii...> { typedef numeric_list<T, i, ii...> type; };
00095 template<typename T, int n>               struct h_skip_helper_numeric<T, n>           { typedef numeric_list<T> type; };
00096 template<typename T>                      struct h_skip_helper_numeric<T, 0>           { typedef numeric_list<T> type; };
00097 
00098 template<int n, typename... tt>             struct h_skip_helper_type;
00099 template<int n, typename t, typename... tt> struct h_skip_helper_type<n, t, tt...> : h_skip_helper_type<n-1, tt...> {};
00100 template<typename t, typename... tt>        struct h_skip_helper_type<0, t, tt...> { typedef type_list<t, tt...> type; };
00101 template<int n>                             struct h_skip_helper_type<n>           { typedef type_list<> type; };
00102 template<>                                  struct h_skip_helper_type<0>           { typedef type_list<> type; };
00103 
00104 template<int n>
00105 struct h_skip {
00106   template<typename T, T... ii>
00107   constexpr static inline typename h_skip_helper_numeric<T, n, ii...>::type helper(numeric_list<T, ii...>) { return typename h_skip_helper_numeric<T, n, ii...>::type(); }
00108   template<typename... tt>
00109   constexpr static inline typename h_skip_helper_type<n, tt...>::type helper(type_list<tt...>) { return typename h_skip_helper_type<n, tt...>::type(); }
00110 };
00111 
00112 template<int n, typename a> struct skip { typedef decltype(h_skip<n>::helper(a())) type; };
00113 
00114 template<int start, int count, typename a> struct slice : take<count, typename skip<start, a>::type> {};
00115 
00116 /* list manipulation: retrieve single element from list */
00117 
00118 template<int n, typename x> struct get;
00119 
00120 template<int n, typename a, typename... as>               struct get<n, type_list<a, as...>>   : get<n-1, type_list<as...>> {};
00121 template<typename a, typename... as>                      struct get<0, type_list<a, as...>>   { typedef a type; };
00122 
00123 template<typename T, int n, T a, T... as>                        struct get<n, numeric_list<T, a, as...>>   : get<n-1, numeric_list<T, as...>> {};
00124 template<typename T, T a, T... as>                               struct get<0, numeric_list<T, a, as...>>   { constexpr static T value = a; };
00125 
00126 /* always get type, regardless of dummy; good for parameter pack expansion */
00127 
00128 template<typename T, T dummy, typename t> struct id_numeric  { typedef t type; };
00129 template<typename dummy, typename t>      struct id_type     { typedef t type; };
00130 
00131 /* equality checking, flagged version */
00132 
00133 template<typename a, typename b> struct is_same_gf : is_same<a, b> { constexpr static int global_flags = 0; };
00134 
00135 /* apply_op to list */
00136 
00137 template<
00138   bool from_left, // false
00139   template<typename, typename> class op,
00140   typename additional_param,
00141   typename... values
00142 >
00143 struct h_apply_op_helper                                        { typedef type_list<typename op<values, additional_param>::type...> type; };
00144 template<
00145   template<typename, typename> class op,
00146   typename additional_param,
00147   typename... values
00148 >
00149 struct h_apply_op_helper<true, op, additional_param, values...> { typedef type_list<typename op<additional_param, values>::type...> type; };
00150 
00151 template<
00152   bool from_left,
00153   template<typename, typename> class op,
00154   typename additional_param
00155 >
00156 struct h_apply_op
00157 {
00158   template<typename... values>
00159   constexpr static typename h_apply_op_helper<from_left, op, additional_param, values...>::type helper(type_list<values...>)
00160   { return typename h_apply_op_helper<from_left, op, additional_param, values...>::type(); }
00161 };
00162 
00163 template<
00164   template<typename, typename> class op,
00165   typename additional_param,
00166   typename a
00167 >
00168 struct apply_op_from_left { typedef decltype(h_apply_op<true, op, additional_param>::helper(a())) type; };
00169 
00170 template<
00171   template<typename, typename> class op,
00172   typename additional_param,
00173   typename a
00174 >
00175 struct apply_op_from_right { typedef decltype(h_apply_op<false, op, additional_param>::helper(a())) type; };
00176 
00177 /* see if an element is in a list */
00178 
00179 template<
00180   template<typename, typename> class test,
00181   typename check_against,
00182   typename h_list,
00183   bool last_check_positive = false
00184 >
00185 struct contained_in_list;
00186 
00187 template<
00188   template<typename, typename> class test,
00189   typename check_against,
00190   typename h_list
00191 >
00192 struct contained_in_list<test, check_against, h_list, true>
00193 {
00194   constexpr static bool value = true;
00195 };
00196 
00197 template<
00198   template<typename, typename> class test,
00199   typename check_against,
00200   typename a,
00201   typename... as
00202 >
00203 struct contained_in_list<test, check_against, type_list<a, as...>, false> : contained_in_list<test, check_against, type_list<as...>, test<check_against, a>::value> {};
00204 
00205 template<
00206   template<typename, typename> class test,
00207   typename check_against
00208   EIGEN_TPL_PP_SPEC_HACK_DEFC(typename, empty)
00209 >
00210 struct contained_in_list<test, check_against, type_list<EIGEN_TPL_PP_SPEC_HACK_USE(empty)>, false> { constexpr static bool value = false; };
00211 
00212 /* see if an element is in a list and check for global flags */
00213 
00214 template<
00215   template<typename, typename> class test,
00216   typename check_against,
00217   typename h_list,
00218   int default_flags = 0,
00219   bool last_check_positive = false,
00220   int last_check_flags = default_flags
00221 >
00222 struct contained_in_list_gf;
00223 
00224 template<
00225   template<typename, typename> class test,
00226   typename check_against,
00227   typename h_list,
00228   int default_flags,
00229   int last_check_flags
00230 >
00231 struct contained_in_list_gf<test, check_against, h_list, default_flags, true, last_check_flags>
00232 {
00233   constexpr static bool value = true;
00234   constexpr static int global_flags = last_check_flags;
00235 };
00236 
00237 template<
00238   template<typename, typename> class test,
00239   typename check_against,
00240   typename a,
00241   typename... as,
00242   int default_flags,
00243   int last_check_flags
00244 >
00245 struct contained_in_list_gf<test, check_against, type_list<a, as...>, default_flags, false, last_check_flags> : contained_in_list_gf<test, check_against, type_list<as...>, default_flags, test<check_against, a>::value, test<check_against, a>::global_flags> {};
00246 
00247 template<
00248   template<typename, typename> class test,
00249   typename check_against
00250   EIGEN_TPL_PP_SPEC_HACK_DEFC(typename, empty),
00251   int default_flags,
00252   int last_check_flags
00253 >
00254 struct contained_in_list_gf<test, check_against, type_list<EIGEN_TPL_PP_SPEC_HACK_USE(empty)>, default_flags, false, last_check_flags> { constexpr static bool value = false; constexpr static int global_flags = default_flags; };
00255 
00256 /* generic reductions */
00257 
00258 template<
00259   typename Reducer,
00260   typename... Ts
00261 > struct reduce;
00262 
00263 template<
00264   typename Reducer
00265 > struct reduce<Reducer>
00266 {
00267   constexpr static inline int run() { return Reducer::Identity; }
00268 };
00269 
00270 template<
00271   typename Reducer,
00272   typename A
00273 > struct reduce<Reducer, A>
00274 {
00275   constexpr static inline A run(A a) { return a; }
00276 };
00277 
00278 template<
00279   typename Reducer,
00280   typename A,
00281   typename... Ts
00282 > struct reduce<Reducer, A, Ts...>
00283 {
00284   constexpr static inline auto run(A a, Ts... ts) -> decltype(Reducer::run(a, reduce<Reducer, Ts...>::run(ts...))) {
00285     return Reducer::run(a, reduce<Reducer, Ts...>::run(ts...));
00286   }
00287 };
00288 
00289 /* generic binary operations */
00290 
00291 struct sum_op           {
00292   template<typename A, typename B> EIGEN_DEVICE_FUNC constexpr static inline auto run(A a, B b) -> decltype(a + b)   { return a + b;   }
00293   static constexpr int Identity = 0;
00294 };
00295 struct product_op       {
00296   template<typename A, typename B> EIGEN_DEVICE_FUNC constexpr static inline auto run(A a, B b) -> decltype(a * b)   { return a * b;   }
00297   static constexpr int Identity = 1;
00298 };
00299 
00300 struct logical_and_op   { template<typename A, typename B> constexpr static inline auto run(A a, B b) -> decltype(a && b)  { return a && b;  } };
00301 struct logical_or_op    { template<typename A, typename B> constexpr static inline auto run(A a, B b) -> decltype(a || b)  { return a || b;  } };
00302 
00303 struct equal_op         { template<typename A, typename B> constexpr static inline auto run(A a, B b) -> decltype(a == b)  { return a == b;  } };
00304 struct not_equal_op     { template<typename A, typename B> constexpr static inline auto run(A a, B b) -> decltype(a != b)  { return a != b;  } };
00305 struct lesser_op        { template<typename A, typename B> constexpr static inline auto run(A a, B b) -> decltype(a < b)   { return a < b;   } };
00306 struct lesser_equal_op  { template<typename A, typename B> constexpr static inline auto run(A a, B b) -> decltype(a <= b)  { return a <= b;  } };
00307 struct greater_op       { template<typename A, typename B> constexpr static inline auto run(A a, B b) -> decltype(a > b)   { return a > b;   } };
00308 struct greater_equal_op { template<typename A, typename B> constexpr static inline auto run(A a, B b) -> decltype(a >= b)  { return a >= b;  } };
00309 
00310 /* generic unary operations */
00311 
00312 struct not_op                { template<typename A> constexpr static inline auto run(A a) -> decltype(!a)      { return !a;      } };
00313 struct negation_op           { template<typename A> constexpr static inline auto run(A a) -> decltype(-a)      { return -a;      } };
00314 struct greater_equal_zero_op { template<typename A> constexpr static inline auto run(A a) -> decltype(a >= 0)  { return a >= 0;  } };
00315 
00316 
00317 /* reductions for lists */
00318 
00319 // using auto -> return value spec makes ICC 13.0 and 13.1 crash here, so we have to hack it
00320 // together in front... (13.0 doesn't work with array_prod/array_reduce/... anyway, but 13.1
00321 // does...
00322 template<typename... Ts>
00323 constexpr inline decltype(reduce<product_op, Ts...>::run((*((Ts*)0))...)) arg_prod(Ts... ts)
00324 {
00325   return reduce<product_op, Ts...>::run(ts...);
00326 }
00327 
00328 template<typename... Ts>
00329 constexpr inline decltype(reduce<sum_op, Ts...>::run((*((Ts*)0))...)) arg_sum(Ts... ts)
00330 {
00331   return reduce<sum_op, Ts...>::run(ts...);
00332 }
00333 
00334 /* reverse arrays */
00335 
00336 template<typename Array, int... n>
00337 constexpr inline Array h_array_reverse(Array arr, numeric_list<int, n...>)
00338 {
00339   return {{array_get<sizeof...(n) - n - 1>(arr)...}};
00340 }
00341 
00342 template<typename T, std::size_t N>
00343 constexpr inline array<T, N> array_reverse(array<T, N> arr)
00344 {
00345   return h_array_reverse(arr, typename gen_numeric_list<int, N>::type());
00346 }
00347 
00348 
00349 /* generic array reductions */
00350 
00351 // can't reuse standard reduce() interface above because Intel's Compiler
00352 // *really* doesn't like it, so we just reimplement the stuff
00353 // (start from N - 1 and work down to 0 because specialization for
00354 // n == N - 1 also doesn't work in Intel's compiler, so it goes into
00355 // an infinite loop)
00356 template<typename Reducer, typename T, std::size_t N, std::size_t n = N - 1>
00357 struct h_array_reduce {
00358   EIGEN_DEVICE_FUNC constexpr static inline auto run(array<T, N> arr, T identity) -> decltype(Reducer::run(h_array_reduce<Reducer, T, N, n - 1>::run(arr, identity), array_get<n>(arr)))
00359   {
00360     return Reducer::run(h_array_reduce<Reducer, T, N, n - 1>::run(arr, identity), array_get<n>(arr));
00361   }
00362 };
00363 
00364 template<typename Reducer, typename T, std::size_t N>
00365 struct h_array_reduce<Reducer, T, N, 0>
00366 {
00367   EIGEN_DEVICE_FUNC constexpr static inline T run(const array<T, N>& arr, T)
00368   {
00369     return array_get<0>(arr);
00370   }
00371 };
00372 
00373 template<typename Reducer, typename T>
00374 struct h_array_reduce<Reducer, T, 0>
00375 {
00376   EIGEN_DEVICE_FUNC constexpr static inline T run(const array<T, 0>&, T identity)
00377   {
00378     return identity;
00379   }
00380 };
00381 
00382 template<typename Reducer, typename T, std::size_t N>
00383 EIGEN_DEVICE_FUNC constexpr inline auto array_reduce(const array<T, N>& arr, T identity) -> decltype(h_array_reduce<Reducer, T, N>::run(arr, identity))
00384 {
00385   return h_array_reduce<Reducer, T, N>::run(arr, identity);
00386 }
00387 
00388 /* standard array reductions */
00389 
00390 template<typename T, std::size_t N>
00391 EIGEN_DEVICE_FUNC constexpr inline auto array_sum(const array<T, N>& arr) -> decltype(array_reduce<sum_op, T, N>(arr, static_cast<T>(0)))
00392 {
00393   return array_reduce<sum_op, T, N>(arr, static_cast<T>(0));
00394 }
00395 
00396 template<typename T, std::size_t N>
00397 EIGEN_DEVICE_FUNC constexpr inline auto array_prod(const array<T, N>& arr) -> decltype(array_reduce<product_op, T, N>(arr, static_cast<T>(1)))
00398 {
00399   return array_reduce<product_op, T, N>(arr, static_cast<T>(1));
00400 }
00401 
00402 template<typename t>
00403 EIGEN_DEVICE_FUNC EIGEN_STRONG_INLINE t array_prod(const std::vector<t>& a) {
00404   eigen_assert(a.size() > 0);
00405   t prod = 1;
00406   for (size_t i = 0; i < a.size(); ++i) { prod *= a[i]; }
00407   return prod;
00408 }
00409 
00410 /* zip an array */
00411 
00412 template<typename Op, typename A, typename B, std::size_t N, int... n>
00413 constexpr inline array<decltype(Op::run(A(), B())),N> h_array_zip(array<A, N> a, array<B, N> b, numeric_list<int, n...>)
00414 {
00415   return array<decltype(Op::run(A(), B())),N>{{ Op::run(array_get<n>(a), array_get<n>(b))... }};
00416 }
00417 
00418 template<typename Op, typename A, typename B, std::size_t N>
00419 constexpr inline array<decltype(Op::run(A(), B())),N> array_zip(array<A, N> a, array<B, N> b)
00420 {
00421   return h_array_zip<Op>(a, b, typename gen_numeric_list<int, N>::type());
00422 }
00423 
00424 /* zip an array and reduce the result */
00425 
00426 template<typename Reducer, typename Op, typename A, typename B, std::size_t N, int... n>
00427 constexpr inline auto h_array_zip_and_reduce(array<A, N> a, array<B, N> b, numeric_list<int, n...>) -> decltype(reduce<Reducer, typename id_numeric<int,n,decltype(Op::run(A(), B()))>::type...>::run(Op::run(array_get<n>(a), array_get<n>(b))...))
00428 {
00429   return reduce<Reducer, typename id_numeric<int,n,decltype(Op::run(A(), B()))>::type...>::run(Op::run(array_get<n>(a), array_get<n>(b))...);
00430 }
00431 
00432 template<typename Reducer, typename Op, typename A, typename B, std::size_t N>
00433 constexpr inline auto array_zip_and_reduce(array<A, N> a, array<B, N> b) -> decltype(h_array_zip_and_reduce<Reducer, Op, A, B, N>(a, b, typename gen_numeric_list<int, N>::type()))
00434 {
00435   return h_array_zip_and_reduce<Reducer, Op, A, B, N>(a, b, typename gen_numeric_list<int, N>::type());
00436 }
00437 
00438 /* apply stuff to an array */
00439 
00440 template<typename Op, typename A, std::size_t N, int... n>
00441 constexpr inline array<decltype(Op::run(A())),N> h_array_apply(array<A, N> a, numeric_list<int, n...>)
00442 {
00443   return array<decltype(Op::run(A())),N>{{ Op::run(array_get<n>(a))... }};
00444 }
00445 
00446 template<typename Op, typename A, std::size_t N>
00447 constexpr inline array<decltype(Op::run(A())),N> array_apply(array<A, N> a)
00448 {
00449   return h_array_apply<Op>(a, typename gen_numeric_list<int, N>::type());
00450 }
00451 
00452 /* apply stuff to an array and reduce */
00453 
00454 template<typename Reducer, typename Op, typename A, std::size_t N, int... n>
00455 constexpr inline auto h_array_apply_and_reduce(array<A, N> arr, numeric_list<int, n...>) -> decltype(reduce<Reducer, typename id_numeric<int,n,decltype(Op::run(A()))>::type...>::run(Op::run(array_get<n>(arr))...))
00456 {
00457   return reduce<Reducer, typename id_numeric<int,n,decltype(Op::run(A()))>::type...>::run(Op::run(array_get<n>(arr))...);
00458 }
00459 
00460 template<typename Reducer, typename Op, typename A, std::size_t N>
00461 constexpr inline auto array_apply_and_reduce(array<A, N> a) -> decltype(h_array_apply_and_reduce<Reducer, Op, A, N>(a, typename gen_numeric_list<int, N>::type()))
00462 {
00463   return h_array_apply_and_reduce<Reducer, Op, A, N>(a, typename gen_numeric_list<int, N>::type());
00464 }
00465 
00466 /* repeat a value n times (and make an array out of it
00467  * usage:
00468  *   array<int, 16> = repeat<16>(42);
00469  */
00470 
00471 template<int n>
00472 struct h_repeat
00473 {
00474   template<typename t, int... ii>
00475   constexpr static inline array<t, n> run(t v, numeric_list<int, ii...>)
00476   {
00477     return {{ typename id_numeric<int, ii, t>::type(v)... }};
00478   }
00479 };
00480 
00481 template<int n, typename t>
00482 constexpr array<t, n> repeat(t v) { return h_repeat<n>::run(v, typename gen_numeric_list<int, n>::type()); }
00483 
00484 /* instantiate a class by a C-style array */
00485 template<class InstType, typename ArrType, std::size_t N, bool Reverse, typename... Ps>
00486 struct h_instantiate_by_c_array;
00487 
00488 template<class InstType, typename ArrType, std::size_t N, typename... Ps>
00489 struct h_instantiate_by_c_array<InstType, ArrType, N, false, Ps...>
00490 {
00491   static InstType run(ArrType* arr, Ps... args)
00492   {
00493     return h_instantiate_by_c_array<InstType, ArrType, N - 1, false, Ps..., ArrType>::run(arr + 1, args..., arr[0]);
00494   }
00495 };
00496 
00497 template<class InstType, typename ArrType, std::size_t N, typename... Ps>
00498 struct h_instantiate_by_c_array<InstType, ArrType, N, true, Ps...>
00499 {
00500   static InstType run(ArrType* arr, Ps... args)
00501   {
00502     return h_instantiate_by_c_array<InstType, ArrType, N - 1, false, ArrType, Ps...>::run(arr + 1, arr[0], args...);
00503   }
00504 };
00505 
00506 template<class InstType, typename ArrType, typename... Ps>
00507 struct h_instantiate_by_c_array<InstType, ArrType, 0, false, Ps...>
00508 {
00509   static InstType run(ArrType* arr, Ps... args)
00510   {
00511     (void)arr;
00512     return InstType(args...);
00513   }
00514 };
00515 
00516 template<class InstType, typename ArrType, typename... Ps>
00517 struct h_instantiate_by_c_array<InstType, ArrType, 0, true, Ps...>
00518 {
00519   static InstType run(ArrType* arr, Ps... args)
00520   {
00521     (void)arr;
00522     return InstType(args...);
00523   }
00524 };
00525 
00526 template<class InstType, typename ArrType, std::size_t N, bool Reverse = false>
00527 InstType instantiate_by_c_array(ArrType* arr)
00528 {
00529   return h_instantiate_by_c_array<InstType, ArrType, N, Reverse>::run(arr);
00530 }
00531 
00532 } // end namespace internal
00533 
00534 } // end namespace Eigen
00535 
00536 #else // Non C++11, fallback to emulation mode
00537 
00538 #include "EmulateCXX11Meta.h"
00539 
00540 #endif
00541 
00542 #endif // EIGEN_CXX11META_H
 All Classes Functions Variables Typedefs Enumerator