{"id":172,"date":"2014-07-15T19:50:53","date_gmt":"2014-07-16T01:50:53","guid":{"rendered":"http:\/\/jacobncalvert.com\/?p=172"},"modified":"2018-02-10T15:59:32","modified_gmt":"2018-02-10T21:59:32","slug":"c-2014-auto-return-deduction-and-more","status":"publish","type":"post","link":"https:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/","title":{"rendered":"C++ 2014: auto return deduction and more!"},"content":{"rendered":"

The new C++ standard-in-the-making codenamed C++1y, has some great new features.<\/p>\n

The most standout addition in my opinion is the ‘return type deduction’ feature which allows functions to use ‘auto’ return types that will be deduced at runtime. There are a few limits on this functionality however. Recursion can only happen if there is at least one return statement that can be evaluated to a non-auto type. For example:<\/p>\n

\/\/ this factorial works\r\nauto factorial(int i)\r\n{\r\n    if(i == 0 || i == 1)\r\n    {\r\n        return 1;\r\n    }\r\n    else\r\n    {\r\n        return i * factorial(i-1);\r\n    }\r\n}\r\n\/\/ this one will not\r\nauto factorial2(int i)\r\n{\r\n    if(i > 1)\r\n    {\r\n        return i * factorial(i-1);\r\n    }\r\n    else\r\n    {\r\n        return 1;\r\n    }\r\n}\r\n\r\n\r\n<\/pre>\n
This feature is very neat and somewhat ‘Pythonic.’ In C++11 the\u00a0lambda<\/i>\u00a0feature already allows this auto typing but in C++14 it will be available to all functions.
\nAnother notable addition to C++ in the latest upcoming release is the introduction of binary literals. With this, you can explicitly specify binary numbers with syntax like:
\n<\/b><\/p>\n
int nine = 0B1001;\r\n<\/pre>\n

\n<\/b>There are many, many more language features being added in C++14; too many to note in detail. Check out more at\u00a0the Wikipedia article<\/a>\u00a0for C++1y or at\u00a0the standards status page for C++<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
The new C++ standard-in-the-making codenamed C++1y, has some great new features. The most standout addition in my opinion is the ‘return type deduction’ feature which allows functions to use ‘auto’ return types that will be deduced at runtime. There are a few limits on this functionality however. Recursion can only happen if there is at least one return statement that can be evaluated to a non-auto type. For example: \/\/ this factorial works auto factorial(int i) { if(i == 0…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[72],"tags":[11],"yoast_head":"\nC++ 2014: auto return deduction and more! - Jacob N Calvert<\/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:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"C++ 2014: auto return deduction and more! - Jacob N Calvert\" \/>\n<meta property=\"og:description\" content=\"The new C++ standard-in-the-making codenamed C++1y, has some great new features. The most standout addition in my opinion is the ‘return type deduction’ feature which allows functions to use ‘auto’ return types that will be deduced at runtime. There are a few limits on this functionality however. Recursion can only happen if there is at least one return statement that can be evaluated to a non-auto type. For example: \/\/ this factorial works auto factorial(int i) { if(i == 0…\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/\" \/>\n<meta property=\"og:site_name\" content=\"Jacob N Calvert\" \/>\n<meta property=\"article:published_time\" content=\"2014-07-16T01:50:53+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-02-10T21:59:32+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/#website\",\"url\":\"https:\/\/jacobncalvert.com\/blog-archive\/\",\"name\":\"Jacob N Calvert\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/jacobncalvert.com\/blog-archive\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/#webpage\",\"url\":\"https:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/\",\"name\":\"C++ 2014: auto return deduction and more! - Jacob N Calvert\",\"isPartOf\":{\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/#website\"},\"datePublished\":\"2014-07-16T01:50:53+00:00\",\"dateModified\":\"2018-02-10T21:59:32+00:00\",\"author\":{\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/#\/schema\/person\/f4b22a996d41bf09ed2bbe22912a8c8a\"},\"breadcrumb\":{\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"item\":{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/\",\"url\":\"https:\/\/jacobncalvert.com\/blog-archive\/\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"position\":2,\"item\":{\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/2014\/07\/15\/c-2014-auto-return-deduction-and-more\/#webpage\"}}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/#\/schema\/person\/f4b22a996d41bf09ed2bbe22912a8c8a\",\"name\":\"Jacob\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/jacobncalvert.com\/blog-archive\/#personlogo\",\"inLanguage\":\"en-US\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/64a2dd1c00cb39dfc19bb1204c87efbc?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/64a2dd1c00cb39dfc19bb1204c87efbc?s=96&d=mm&r=g\",\"caption\":\"Jacob\"},\"sameAs\":[\"https:\/\/jacobncalvert.com\"],\"url\":\"https:\/\/jacobncalvert.com\/blog-archive\/author\/jcalvert\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","_links":{"self":[{"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/posts\/172"}],"collection":[{"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/comments?post=172"}],"version-history":[{"count":3,"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/posts\/172\/revisions"}],"predecessor-version":[{"id":175,"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/posts\/172\/revisions\/175"}],"wp:attachment":[{"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/media?parent=172"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/categories?post=172"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jacobncalvert.com\/blog-archive\/wp-json\/wp\/v2\/tags?post=172"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}