{"id":6695,"date":"2022-09-04T16:36:04","date_gmt":"2022-09-04T11:06:04","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-transform-stdpair-to-stdtuple-with-any-number-of-elements\/"},"modified":"2022-09-04T16:36:04","modified_gmt":"2022-09-04T11:06:04","slug":"solved-transform-stdpair-to-stdtuple-with-any-number-of-elements","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-transform-stdpair-to-stdtuple-with-any-number-of-elements\/","title":{"rendered":"[Solved] Transform std::pair to std::tuple with any number of elements"},"content":{"rendered":"

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Option #1<\/h3>\n
#include <cstddef>\n#include <type_traits>\n#include <utility>\n#include <tuple>\n\ntemplate <typename A, typename B>\nstruct merge_tuples\n{\n    static_assert(std::tuple_size<A>::value == std::tuple_size<B>::value, \"!\");\n\n    template <std::size_t... Is>\n    static auto merge(std::index_sequence<Is...>) noexcept\n        -> std::tuple<typename std::decay<decltype(std::declval<typename std::tuple_element<Is, A>::type>()\n                                                 + std::declval<typename std::tuple_element<Is, B>::type>())\n                               >::type...>;\n\n    using type = decltype(merge(std::make_index_sequence<std::tuple_size<A>::value>{}));    \n};\n<\/code><\/pre>\n
DEMO<\/strong><\/a><\/p>\n
Option #2<\/h3>\n
#include <type_traits>\n#include <utility>\n\ntemplate <typename A, typename B>\nstruct merge_tuples;\n\ntemplate <template <typename...> class Tuple, typename... Ts, typename... Us>\nstruct merge_tuples<Tuple<Ts...>, Tuple<Us...>>\n{\n    static_assert(sizeof...(Ts) == sizeof...(Us), \"!\");\n\n    using type = Tuple<typename std::decay<decltype(std::declval<Ts>()\n                                                  + std::declval<Us>())\n                                >::type...>;\n};\n<\/code><\/pre>\n
DEMO 2<\/strong><\/a><\/p>\n<\/p><\/div>\n
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            4<\/span> <\/p><\/div>\n<\/div>\n
[ad_2]<\/p>\n
solved Transform std::pair to std::tuple with any number of elements <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] Option #1 #include <cstddef> #include <type_traits> #include <utility> #include <tuple> template <typename A, typename B> struct merge_tuples { static_assert(std::tuple_size<A>::value == std::tuple_size<B>::value, “!”); template <std::size_t… Is> static auto merge(std::index_sequence<Is…>) noexcept -> std::tuple<typename std::decay<decltype(std::declval<typename std::tuple_element<Is, A>::type>() + std::declval<typename std::tuple_element<Is, B>::type>()) >::type…>; using type = decltype(merge(std::make_index_sequence<std::tuple_size<A>::value>{})); }; DEMO Option #2 #include <type_traits> #include <utility> template <typename A, … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,513,1870,435,1869],"class_list":["post-6695","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-c11","tag-stdtuple","tag-templates","tag-variadic-templates"],"yoast_head":"\n[Solved] Transform std::pair to std::tuple with any number of elements - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-transform-stdpair-to-stdtuple-with-any-number-of-elements\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Transform std::pair to std::tuple with any number of elements - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] Option #1 #include <cstddef> #include <type_traits> #include <utility> #include <tuple> template <typename A, typename B> struct merge_tuples { static_assert(std::tuple_size<A>::value == std::tuple_size<B>::value, "!"); template <std::size_t... Is> static auto merge(std::index_sequence<Is...>) noexcept -> std::tuple<typename std::decay<decltype(std::declval<typename std::tuple_element<Is, A>::type>() + std::declval<typename std::tuple_element<Is, B>::type>()) >::type...>; using type = decltype(merge(std::make_index_sequence<std::tuple_size<A>::value>{})); }; DEMO Option #2 #include <type_traits> #include <utility> template <typename A, ... 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Is> static auto merge(std::index_sequence<Is...>) noexcept -> std::tuple<typename std::decay<decltype(std::declval<typename std::tuple_element<Is, A>::type>() + std::declval<typename std::tuple_element<Is, B>::type>()) >::type...>; using type = decltype(merge(std::make_index_sequence<std::tuple_size<A>::value>{})); }; DEMO Option #2 #include <type_traits> #include <utility> template <typename A, ... 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