{"id":6222,"date":"2022-09-02T04:30:05","date_gmt":"2022-09-01T23:00:05","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-chain-and-serialize-functions-by-overloading-the-operator\/"},"modified":"2022-09-02T04:30:05","modified_gmt":"2022-09-01T23:00:05","slug":"solved-how-to-chain-and-serialize-functions-by-overloading-the-operator","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-chain-and-serialize-functions-by-overloading-the-operator\/","title":{"rendered":"[Solved] How to chain and serialize functions by overloading the | operator"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-63045671\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"63045671\" data-parentid=\"63025836\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" 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>First I assume you have some basics that look like this<\/p>\n<pre><code>#include &lt;iostream&gt;\nstruct vec2 {\n    double x;\n    double y;\n};\nstd::ostream&amp; operator&lt;&lt;(std::ostream&amp; stream, vec2 v2) {return stream&lt;&lt;v2.x&lt;&lt;','&lt;&lt;v2.y;}\n\n\/\/real methods\nvec2 translate(vec2 in, double a) {return vec2{in.x+a, in.y+a};} \/\/dummy placeholder implementations\nvec2 rotate(vec2 in, double a) {return vec2{in.x+1, in.y-1};}\nvec2 scale(vec2 in, double a) {return vec2{in.x*a, in.y*a};}\n<\/code><\/pre>\n<p>So what you want is a proxy class for operations, where a proxy object is constructed with the function and the &#8220;other parameters&#8221;. (I made the function a template parameter, which prevents the use of function pointers, and helps the optimizer to inline, making this nearly zero overhead.)<\/p>\n<pre><code>#include &lt;type_traits&gt;\n\/\/operation proxy class\ntemplate&lt;class rhst, \/\/type of the only parameter\n     vec2(*f)(vec2,rhst)&gt; \/\/the function to call\nclass vec2_op1 {\n    std::decay_t&lt;rhst&gt; rhs; \/\/store the parameter until the call\npublic:\n    vec2_op1(rhst rhs_) : rhs(std::forward&lt;rhst&gt;(rhs_)) {}\n    vec2 operator()(vec2 lhs) {return f(lhs, std::forward&lt;rhst&gt;(rhs));}\n};\n\n\/\/proxy methods\nvec2_op1&lt;double,translate&gt; translate(double a) {return {a};}\nvec2_op1&lt;double,rotate&gt; rotate(double a) {return {a};}\nvec2_op1&lt;double,scale&gt; scale(double a) {return {a};}\n<\/code><\/pre>\n<p>And then you simply make that chainable<\/p>\n<pre><code>\/\/lhs is a vec2, rhs is a vec2_operation to use\ntemplate&lt;class rhst, vec2(*f)(vec2,rhst)&gt;\nvec2&amp; operator|(vec2&amp; lhs, vec2_op1&lt;rhst, f&gt;&amp;&amp; op) {return lhs=op(lhs);}\n<\/code><\/pre>\n<p>Usage is simple:<\/p>\n<pre><code>int main() {\n    vec2 v2{3,5};\n    v2 | translate(2.5) | rotate(30) | translate(3) | scale(2);\n    std::cout &lt;&lt; v2;\n}\n<\/code><\/pre>\n<p><a rel=\"nofollow noopener\" target=\"_blank\" href=\"http:\/\/coliru.stacked-crooked.com\/a\/9b58992b36ff12d3\">http:\/\/coliru.stacked-crooked.com\/a\/9b58992b36ff12d3<\/a><\/p>\n<p>Note: No allocations, no pointers, no copies or moves.  This should generate the same code as if you just did <code>v2.translate(2.5); v2.rotate(30); v2.scale(10);<\/code><br \/>\ndirectly.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">4<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to chain and serialize functions by overloading the | operator <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] First I assume you have some basics that look like this #include &lt;iostream&gt; struct vec2 { double x; double y; }; std::ostream&amp; operator&lt;&lt;(std::ostream&amp; stream, vec2 v2) {return stream&lt;&lt;v2.x&lt;&lt;&#8216;,'&lt;&lt;v2.y;} \/\/real methods vec2 translate(vec2 in, double a) {return vec2{in.x+a, in.y+a};} \/\/dummy placeholder implementations vec2 rotate(vec2 in, double a) {return vec2{in.x+1, in.y-1};} vec2 scale(vec2 in, double a) &#8230; <a title=\"[Solved] How to chain and serialize functions by overloading the | operator\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-chain-and-serialize-functions-by-overloading-the-operator\/\" aria-label=\"More on [Solved] How to chain and serialize functions by overloading the | operator\">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":[324,1695,1696,1525,1697],"class_list":["post-6222","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-c17","tag-chaining","tag-operator-overloading","tag-pipelining"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to chain and serialize functions by overloading the | operator - 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-how-to-chain-and-serialize-functions-by-overloading-the-operator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to chain and serialize functions by overloading the | operator - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] First I assume you have some basics that look like this #include &lt;iostream&gt; struct vec2 { double x; double y; }; std::ostream&amp; operator&lt;&lt;(std::ostream&amp; stream, vec2 v2) {return stream&lt;&lt;v2.x&lt;&lt;&#039;,&#039;&lt;&lt;v2.y;} \/\/real methods vec2 translate(vec2 in, double a) {return vec2{in.x+a, in.y+a};} \/\/dummy placeholder implementations vec2 rotate(vec2 in, double a) {return vec2{in.x+1, in.y-1};} vec2 scale(vec2 in, double a) ... 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