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unsupported/CXX11/Core: allow gen_numeric_list to have a starting point

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Add a template parameter to gen_numeric_list that acts as a starting
point for the list, i.e. gen_numeric_list<int, 5, 4> will generate a
numeric_list<int, 4, 5, 6, 7, 8>.
This commit is contained in:
Christian Seiler
2014-06-04 19:54:22 +02:00
parent 58cfac9a12
commit cee62018fc
2 changed files with 24 additions and 6 deletions
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12
unsupported/Eigen/CXX11/src/Core/util/CXX11Meta.h
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@@ -42,14 +42,14 @@ struct numeric_list<T, n, nn...> { constexpr static std::size_t count = sizeof..
* typename gen_numeric_list_repeated<int, 0, 5>::type numeric_list<int, 0,0,0,0,0>
*/
template<typename T, std::size_t n, T... ii> struct gen_numeric_list : gen_numeric_list<T, n-1, n-1, ii...> {};
template<typename T, T... ii> struct gen_numeric_list<T, 0, ii...> { typedef numeric_list<T, ii...> type; };
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...> {};
template<typename T, T start, T... ii> struct gen_numeric_list<T, 0, start, ii...> { typedef numeric_list<T, ii...> type; };
template<typename T, std::size_t n, T... ii> struct gen_numeric_list_reversed : gen_numeric_list_reversed<T, n-1, ii..., n-1> {};
template<typename T, T... ii> struct gen_numeric_list_reversed<T, 0, ii...> { typedef numeric_list<T, ii...> type; };
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> {};
template<typename T, T start, T... ii> struct gen_numeric_list_reversed<T, 0, start, ii...> { typedef numeric_list<T, ii...> type; };
template<typename T, std::size_t n, T a, T b, T... ii> struct gen_numeric_list_swapped_pair : gen_numeric_list_swapped_pair<T, n-1, a, b, (n-1) == a ? b : ((n-1) == b ? a : (n-1)), ii...> {};
template<typename T, T a, T b, T... ii> struct gen_numeric_list_swapped_pair<T, 0, a, b, ii...> { typedef numeric_list<T, ii...> type; };
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...> {};
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; };
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...> {};
template<typename T, T V, T... nn> struct gen_numeric_list_repeated<T, 0, V, nn...> { typedef numeric_list<T, nn...> type; };