WebAug 18, 2024 · This will enable us to access the elements in sequence. Here, the C++14 type std::index_sequence comes in very handy. It provides us with a way to create a pack of compile time constant integers 2 that indexes the elements of the tuple. WebJan 31, 2024 · The C++ Standard Library defines std::integer_sequence, but then std::index_sequenceis just integer_sequenceover size_t. See @cppreference.com. We can transform our code into: templatevoidprintElem(constT&x){std::cout<<<',';};template

Mundane std::tuple tricks: Creating interesting index sequences

WebMar 9, 2024 · compile-time at each specific index. This is a job for std::index_sequence, and we can leverage C++17’s CTAD of std::arrayalong with auto-deduced return types to make this even easier: // Creates a std::array by building it from the string view WebDec 2, 2015 · To make this non-recursive, you must replace std::make_index_sequence with a non-recursive implementation. I left it with std::make_index_sequence in order to reduce the amount of unrelated code. How it works deduct has a specialization of deduct_impl that is generated from the index sequence template argument it receives. baku azerbaijan train

std::index_sequence and its Improvement in C++20

Webindex_sequence< std::size_t N > Notes: When available (C++14 or newer), the above are type-aliases for std::integer_sequence and std::index_sequence. Header … WebNov 27, 2024 · I> constexpr decltype (auto) apply_impl ( F && f, Tuple && t, std::index_sequence) { // This implementation is valid since C++20 (via P1065R2) // In C++17, a constexpr counterpart of std::invoke is actually needed here return std::invoke(std::forward( f), std::get(std::forward( t)) ...); } template inline constexpr bool … WebFeb 14, 2024 · Is> void for_each_tuple_impl(TupleT&& tp, Fn&& fn, std::index_sequence) { (fn(std::get(std::forward(tp))), ...); } template >> void for_each_tuple(TupleT&& tp, Fn&& fn) { for_each_tuple_impl(std::forward(tp), std::forward (fn), std::make_index_sequence{}); } … arebar