C++14 FAQs by Chandra Shekhar Kumar

Author:Chandra Shekhar Kumar [Kumar, Chandra Shekhar]
Language: eng
Format: epub
Published: 2014-06-20T21:00:00+00:00

0.48

Custom Sequence : Addition

*** Question 48 Custom Sequence : Addition

Generate a custom sequence by addition of a constant to all the elements of a given integer sequence, i.e. std::integer_sequence<T, I...>

gets transformed to

std::integer_sequence<T, N+I...>

for a compile time constant N.

SOLUTION OF QUESTION 48

1#include <utility>

2

3template<int N, typename T, T... I>

4constexpr std::integer_sequence<T, N+I...>

5add(std::integer_sequence<T, I...>) noexcept

6{

7 return {};

8}

9

10using orig_seq =

11 std::integer_sequence<std::size_t, 1, 2, 3, 4, 5>;

12

13using expected_seq =

14 std::integer_sequence<std::size_t, 6, 7, 8, 9, 10>;

15

16auto add5_seq = add<5>(orig_seq());

17

18static_assert(std::is_same<decltype(add5_seq), expected_seq>::value, "");

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