{"id":18931,"date":"2025-07-10T10:53:28","date_gmt":"2025-07-10T10:53:28","guid":{"rendered":"http:\/\/www.max-sperling.bplaced.net\/?p=18931"},"modified":"2025-07-10T10:56:02","modified_gmt":"2025-07-10T10:56:02","slug":"stdoptional-showcase","status":"publish","type":"post","link":"http:\/\/www.max-sperling.bplaced.net\/?p=18931","title":{"rendered":"Showcase for std::optional"},"content":{"rendered":"<pre class=\"brush: cpp; gutter: false; title: ; notranslate\" title=\"\">\r\n#include &lt;iostream&gt;\r\n#include &lt;optional&gt;\r\n#include &lt;string&gt;\r\n\r\nstd::optional&lt;int&gt; parse_int(const std::string&amp; s)\r\n{\r\n  try {\r\n      return std::stoi(s);\r\n  } catch (...) {\r\n      return std::nullopt;\r\n  }\r\n}\r\n\r\nint main()\r\n{\r\n  using namespace std;\r\n\r\n  optional num = parse_int(&quot;bs&quot;);\r\n\r\n  \/\/ cout &lt;&lt; *num &lt;&lt; endl; \/\/ Prints uninitialzed value at address\r\n  \/\/ cout &lt;&lt; num.value() &lt;&lt; endl; \/\/ Throws std::bad_optional_access\r\n  \/\/ cout &lt;&lt; num.value_or(0) &lt;&lt; endl; \/\/ Prints default value 0\r\n  if (num) { cout &lt;&lt; num.value() &lt;&lt; endl; } \/\/ Prints nothing\r\n\r\n  return 0;\r\n}\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false},"categories":[80],"tags":[],"_links":{"self":[{"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/posts\/18931"}],"collection":[{"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=18931"}],"version-history":[{"count":4,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/posts\/18931\/revisions"}],"predecessor-version":[{"id":18935,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=\/wp\/v2\/posts\/18931\/revisions\/18935"}],"wp:attachment":[{"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=18931"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=18931"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.max-sperling.bplaced.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=18931"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}