{"id":1102,"date":"2022-08-30T15:12:25","date_gmt":"2022-08-30T15:12:25","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2013\/11\/09\/problem-about-type-safety-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:12:25","modified_gmt":"2022-08-30T15:12:25","slug":"problem-about-type-safety-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/problem-about-type-safety-collection-of-common-programming-errors\/","title":{"rendered":"problem about type-safety-Collection of common programming errors"},"content":{"rendered":"<ul>\n<li><img decoding=\"async\" src=\"http:\/\/i.stack.imgur.com\/sEg1T.jpg?s=32&amp;g=1\" \/><br \/>\nVilhelm Gray<br \/>\nc casting type-conversion c99 type-safety<br \/>\nI have a char array holding several characters. I want to compare one of these characters with an unsigned char variable. For example:char myarr = { 20, 14, 5, 6, 42 }; const unsigned char foobar = 133;myarr[2] = foobar;if(myarr[2] == foobar){printf(&#8220;You win a shmoo!\\n&#8221;); }Is this comparison type safe?I know from the C99 standard that char, signed char, and unsigned char are three different types (section 6.2.5 paragraph 14).Nevertheless, can I safely convert between unsigned char and char, and back, without losing precision and without risking undefined (or implementation-defined) behavior?In section 6.2.5 paragraph 15:The implementation shall define char to have the same range,representation, and behavior as either signed char or unsigned char.In section 6.3.1.3 paragraph 3:Otherwise, the new type is signed and the value cannot be represented in it; either the result is impl<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/2a04086d7656ac97e09c20c4fe4d8266?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nsharptooth<br \/>\nc++ enums types type-safety<br \/>\nWith the following C++ definitions:enum EnumA {EA_Element = 1 };enum EnumB {EB_Element = 10 };the following code won&#8217;t com<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/e0ed39dc4ab81e6c35f2681503b7c62a?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\ntroutwine<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/14a4ec3cdc51bfd7e6f4d8a61e007592?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nFishtoaster<br \/>\ntype-systems type-safety weak-typing<br \/>\nThis came up in a discussion with a f<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/67ca8050503b08081e79df980d2ca14f?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nigaar<br \/>\njavascript data type-safety<br \/>\nBecause of the need constantly arising on detecting data types, and I have written the following function that so far has served well, so I would like to share the code with you. However I&#8217;m beginning to think that this maybe isn&#8217;t an efficient way for type detection.function detectType(data) {\/\/ analyze data to distinguish object types from primitive typesvar dataType = typeof data;var toClass = {}.toString; \/\/ this is used to detect object typesvar isPrimitive;var isFalsy = false;switch(dataType) {case &#8216;string&#8217;:isFalsy = !data;if(isFalsy) {dataType = &#8217;empty string&#8217;; \/\/ Only if you want to distingush<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/908d58f023f47e0a7d07fc671606341d?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\naaronasterling<br \/>\ntype-safety language-theory turing-complete<br \/>\nMy understanding is that it means that one can potentially write a program to formally prove that a program written in a statically typed language will be free of a certain (small) subset of defects.My problem<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/71a257df94db5d04b4f2ec6e1ecc45f7?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nJeff Axelrod<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/i.stack.imgur.com\/nyzNK.png?s=32&amp;g=1\" \/><br \/>\nPaul<br \/>\nc++ c++11 variadic-templates type-safety<br \/>\nThere are several implementations of variadic templates printf function. One is this:void printf(const char* s) {while (*s) {if (*s == &#8216;%&#8217; &amp;&amp; *++s != &#8216;%&#8217;) throw std::runtime_error(&#8220;invalid f<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/123707b983c82d74492ee5363d36509b?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nPrasoon Saurav<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/68d2dad371ce22525ad3dfe59a6b60bb?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nPaul Manta<br \/>\nc# c++ type-safety<br \/>\nI was reading through the questions with most votes from the history tag and<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/eabce8cd59f72d8f9e7db06a0343bdb1?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nnponeccop<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/i.stack.imgur.com\/KPUcH.png?s=32&amp;g=1\" \/><br \/>\nMechanical snail<br \/>\nc pointers casting function-pointers type-safety<br \/>\nI&#8217;m just beginning to wrap my head around function pointers in C. To understand how casting of function pointers works, I wrote the following program. It basically creates a function pointer to a function that takes one parameter, casts it to a function pointer with three parameters, and calls the function, supplying three parameters. I was curious what would happen<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/10a3b32c607627841f9cad549fe6de5e?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nSoroush<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/37335856df5e5e73d82bca5a805bd647?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nHasturkun<br \/>\nc++ c type-safety<br \/>\nPossible Duplicates:What is Type-safe?What is type-safety? I was reading about<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/d8e59c4029694b9dd0ed7a37fed4d6ad?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nSinan \u00dcn\u00fcr<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/df22611131aab1cc1f41fa8ea463f604?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nPawe\u0142 Hajdan<br \/>\nphp oop type-safety<br \/>\nPHP, as we all know is very loosely typed. The language does not require you to specify any kind of type for function parameters or class variables. This can be a powerful feature.Sometimes though, it can make debugging your script a painful experience. For example, passing one kind of object into a method that expects a different kind of object can produce error messages complaining that a certain variable\/method doesn&#8217;t exist for the passed object. These situations a<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/74b0d07592a82cce27e4766ad89cc552?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nGreyCat<br \/>\njava reflection compiler-warnings type-safety<br \/>\nI&#8217;m trying to use one of the simplest forms of reflection to create an instance of class:package some.common.prefix;public interface My {void configure(&#8230;);void process(&#8230;); }public class MyExample implements My {&#8230; \/\/ proper implementation }String myClassName = &#8220;MyExample&#8221;; \/\/ read from an external file in realityClass<\/li>\n<\/ul>\n<p id=\"rop\"><small>Originally posted 2013-11-09 23:24:39. <\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>Vilhelm Gray c casting type-conversion c99 type-safety I have a char array holding several characters. I want to compare one of these characters with an unsigned char variable. For example:char myarr = { 20, 14, 5, 6, 42 }; const unsigned char foobar = 133;myarr[2] = foobar;if(myarr[2] == foobar){printf(&#8220;You win a shmoo!\\n&#8221;); }Is this comparison [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1102","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1102","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=1102"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/1102\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=1102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=1102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=1102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}