{"id":24065,"date":"2022-11-30T05:41:56","date_gmt":"2022-11-30T00:11:56","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-turning-a-bounded-stdlist-of-parameters-into-a-type-stdtuple-tup\/"},"modified":"2022-11-30T05:41:56","modified_gmt":"2022-11-30T00:11:56","slug":"solved-turning-a-bounded-stdlist-of-parameters-into-a-type-stdtuple-tup","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-turning-a-bounded-stdlist-of-parameters-into-a-type-stdtuple-tup\/","title":{"rendered":"[Solved] Turning a BOUNDED std::list of parameters into a type std::tuple tup"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-28638147\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"28638147\" data-parentid=\"28637654\" data-score=\"0\" data-position-on-page=\"3\" data-highest-scored=\"0\" data-question-has-accepted-highest-score=\"0\" itemprop=\"suggestedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>This code works correctly on clang and g++ (using C++11):<\/p>\n<p><a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/coliru.stacked-crooked.com\/a\/c8071ab447e10a31\">http:\/\/coliru.stacked-crooked.com\/a\/c8071ab447e10a31<\/a><\/p>\n<p>Produces a <code>std::tuple<\/code> with <code>Max_N<\/code> elements of the same type, and fills it up with the first values of the given list. If less elements in list than <code>Max_N<\/code>, fills the last elements with sentinel values.<\/p>\n<p>In practice, using <code>std::array&lt;C, N&gt;<\/code> may be more useful for something like this, if there is a need to pass from a list with a dynamic number of elements to one from a constant number of elements.<\/p>\n<pre><code>#include &lt;tuple&gt;\n#include &lt;type_traits&gt;\n#include &lt;list&gt;\n#include &lt;iostream&gt;\n#include &lt;typeinfo&gt;\n\ntemplate&lt;std::size_t Max_N, typename List&gt;\nclass list_to_tuple {\npublic:\n    using value_type = typename List::value_type;\n    using iterator_type = typename List::const_iterator;\n    using tuple_type = decltype(std::tuple_cat(\n        std::tuple&lt;typename List::value_type&gt;(),\n        typename list_to_tuple&lt;Max_N-1, List&gt;::tuple_type()\n    ));\n\n    tuple_type operator()(const List&amp; lst, const value_type&amp; sentinel) {\n        return convert(lst.begin(), lst.end(), sentinel);\n    }\n\n    tuple_type convert(iterator_type begin, iterator_type end, const value_type&amp; sentinel) const {\n        list_to_tuple&lt;Max_N-1, List&gt; remaining;\n        if(begin != end) {\n            auto current = std::make_tuple(*begin);\n            ++begin;\n            return std::tuple_cat(current, remaining.convert(begin, end, sentinel));\n        } else {\n            return std::tuple_cat(std::make_tuple(sentinel), remaining.convert(begin, end, sentinel));\n        }\n    }\n};\n\ntemplate&lt;typename List&gt;\nclass list_to_tuple&lt;0, List&gt; {\npublic:\n    using value_type = typename List::value_type;\n    using iterator_type = typename List::const_iterator;\n    using tuple_type = std::tuple&lt;&gt;;\n\n    tuple_type convert(iterator_type begin, iterator_type end, const value_type&amp; sentinel) const {\n        return std::tuple&lt;&gt;();\n    }\n};\n\nint main() {\n    std::list&lt;int&gt; lst = {1, 2, 3};\n    list_to_tuple&lt;5, std::list&lt;int&gt;&gt; to_tup;\n    auto tup = to_tup(lst, 0);\n    std::cout &lt;&lt; std::get&lt;0&gt;(tup) &lt;&lt; std::endl;\n    std::cout &lt;&lt; std::get&lt;1&gt;(tup) &lt;&lt; std::endl;\n    std::cout &lt;&lt; std::get&lt;2&gt;(tup) &lt;&lt; std::endl;\n    std::cout &lt;&lt; std::get&lt;3&gt;(tup) &lt;&lt; std::endl;\n    std::cout &lt;&lt; std::get&lt;4&gt;(tup) &lt;&lt; std::endl;\n    std::cout &lt;&lt; typeid(tup).name() &lt;&lt; std::endl;\n}\n<\/code><\/pre>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">11<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Turning a BOUNDED std::list<class> of parameters into a type std::tuple<class,class,class> tup<classObj1, classObj2,classObj2> <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] This code works correctly on clang and g++ (using C++11): http:\/\/coliru.stacked-crooked.com\/a\/c8071ab447e10a31 Produces a std::tuple with Max_N elements of the same type, and fills it up with the first values of the given list. If less elements in list than Max_N, fills the last elements with sentinel values. In practice, using std::array&lt;C, N&gt; may be &#8230; <a title=\"[Solved] Turning a BOUNDED std::list of parameters into a type std::tuple tup\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-turning-a-bounded-stdlist-of-parameters-into-a-type-stdtuple-tup\/\" aria-label=\"More on [Solved] Turning a BOUNDED std::list of parameters into a type std::tuple tup\">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":[324,513,514,1064,1869],"class_list":["post-24065","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-c11","tag-template-meta-programming","tag-tuples","tag-variadic-templates"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Turning a BOUNDED std::list of parameters into a type std::tuple tup - 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-turning-a-bounded-stdlist-of-parameters-into-a-type-stdtuple-tup\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Turning a BOUNDED std::list of parameters into a type std::tuple tup - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This code works correctly on clang and g++ (using C++11): http:\/\/coliru.stacked-crooked.com\/a\/c8071ab447e10a31 Produces a std::tuple with Max_N elements of the same type, and fills it up with the first values of the given list. 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