{"id":1007,"date":"2022-12-29T21:53:12","date_gmt":"2022-12-29T12:53:12","guid":{"rendered":"https:\/\/dev.activebasic.com\/egtra\/?p=1007"},"modified":"2022-12-29T22:14:15","modified_gmt":"2022-12-29T13:14:15","slug":"boost-typeerasure%e3%81%a7move_only_function%e3%82%92%e6%a8%a1%e5%80%a3","status":"publish","type":"post","link":"https:\/\/dev.activebasic.com\/egtra\/2022\/12\/29\/1007\/","title":{"rendered":"Boost.TypeErasure\u3067move_only_function\u3092\u6a21\u5023"},"content":{"rendered":"<p><a href=\"https:\/\/www.open-std.org\/jtc1\/sc22\/wg21\/docs\/papers\/2021\/p0288r9.html\">P0288R9: move_only_function<\/a>\u304c\u5f85\u3061\u9060\u3057\u304f\u3001\u4f3c\u305f\u3088\u3046\u306a\u3082\u306e\uff08\u52a3\u5316\u7248\uff09\u3092\u81ea\u4f5c\u3057\u3088\u3046\u304b\u3069\u3046\u304b\u3088\u304f\u60a9\u3093\u3067\u3044\u307e\u3059\u3002\u305d\u3093\u306a\u6298\u3001<a href=\"https:\/\/www.boost.org\/doc\/libs\/release\/doc\/html\/boost_typeerasure.html\">Boost.TypeErasure<\/a>\u3067\u7c21\u5358\u306b\u4f5c\u308c\u308b\u306e\u3067\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u3064\u304d\u3001\u8a66\u3057\u3066\u3044\u307e\u3057\u305f\u3002<\/p>\n<p>\u305d\u306e\u7d50\u679c\u304c\u3053\u308c\u3067\u3059: <a href=\"https:\/\/wandbox.org\/permlink\/GwWCWR0PtF4XXqmh\">https:\/\/wandbox.org\/permlink\/GwWCWR0PtF4XXqmh<\/a><\/p>\n<pre lang=\"cpp\">#include <iostream>\r\n#include <memory>\r\n#include <boost\/type_erasure\/any.hpp>\r\n#include <boost\/type_erasure\/builtin.hpp>\r\n#include <boost\/type_erasure\/callable.hpp>\r\n#include <boost\/type_erasure\/relaxed.hpp>\r\n\r\ntemplate<typename T>\r\nusing function_t = boost::type_erasure::any<boost::mpl::vector<\r\n    boost::type_erasure::relaxed,\r\n    boost::type_erasure::constructible<boost::type_erasure::_self(boost::type_erasure::_self&#038;&#038;)>,\r\n    boost::type_erasure::destructible<>,\r\n    boost::type_erasure::callable<T>>>;\r\n\r\nint main()\r\n{\r\n    auto p = std::make_unique<int>(100);\r\n    auto q = std::make_unique<int>(200);\r\n    function_t<void(std::unique_ptr<int>)> x([q = std::move(q)](std::unique_ptr<int> p) mutable\r\n    {\r\n        std::cout << *p << ' ' << *q << std::endl;\r\n    });\r\n    x(std::move(p));\r\n}<\/pre>\n<p>\u30b3\u30d4\u30fc\u4e0d\u53ef\u80fd\u306a\u95a2\u6570\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u683c\u7d0d\u3059\u308b\u3053\u3068\u306b\u6210\u529f\u306f\u3057\u3066\u3044\u307e\u3059\u3002\u305f\u3060\u3001TypeErasure\u306e\u30b3\u30fc\u30c9\u3092\u3071\u3063\u3068\u8aad\u3093\u3060\u611f\u3058\u3001\u3069\u3046\u3082\u5185\u90e8\u3067\u7121\u6761\u4ef6\u306b\u52d5\u7684\u30e1\u30e2\u30ea\u78ba\u4fdd\u3059\u308b\u96f0\u56f2\u6c17\u306a\u306e\u3067\u3001\u305d\u3053\u307e\u3067\u9b45\u529b\u7684\u306a\u3084\u308a\u65b9\u3067\u306f\u306a\u3044\u306a\u3068\u601d\u3063\u3066\u3044\u307e\u3059\u3002move_only_function\u3067\u306f\u3001\u5c0f\u30b5\u30a4\u30ba\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5165\u308c\u308b\u969b\u306f\u52d5\u7684\u30e1\u30e2\u30ea\u78ba\u4fdd\u3092\u3057\u306a\u3044\u3053\u3068\u304c\u6c42\u3081\u3089\u308c\u3066\u304a\u308a\u3001std::function\u3082\u305d\u3046\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<p>\u5fc5\u305a\u52d5\u7684\u30e1\u30e2\u30ea\u78ba\u4fdd\u3059\u308b\u306a\u3089std::function\u3068std::shared_ptr\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u306a\u3093\u3068\u304b\u3059\u308b\u65b9\u6cd5\u3082\u8003\u3048\u3089\u308c\u307e\u3059\u3002\u305d\u308c\u3068Boost.TypeErasure\u3068\u5b8c\u5168\u81ea\u4f5c\u3068\u3067\u3069\u3046\u3059\u308b\u304b\u3001\u4eca\u65e5\u3082\u8ff7\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>C++23\u306emove_only_function\u306e\u3088\u3046\u306a\u3082\u306e\u3092Boost.TypeErasure\u3067\u6a21\u5023\u3059\u308b\u3053\u3068\u3092\u601d\u3044\u4ed8\u3044\u305f\u306e\u3067\u3001\u3084\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1007","post","type-post","status-publish","format-standard","hentry","category-cpp"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.0 - 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