{"id":532,"date":"2022-08-30T15:02:55","date_gmt":"2022-08-30T15:02:55","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2013\/11\/09\/problem-about-typechecking-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:02:55","modified_gmt":"2022-08-30T15:02:55","slug":"problem-about-typechecking-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/problem-about-typechecking-collection-of-common-programming-errors\/","title":{"rendered":"problem about typechecking-Collection of common programming errors"},"content":{"rendered":"<ul>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/224884ff0b79e700e516e24fbcae6423?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nNathan Kleyn<br \/>\ndebugging haskell types typechecking<br \/>\ncompress xs@(_:_:_) = (ifte ((==) head head.tail) ((compress.).(:) head tail.tail) ((:) head compress.tail) ) xsResults in a type error, but I can&#8217;t see why. It should be equivalent tocompress xs@(_:_:_) = (ifte (((==) head head.tail) xs) (((compress.).(:) he<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/1074f0a031cca12280359231a87662af?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nEric<br \/>\nreflection haskell typechecking<br \/>\nThis is a minimal example taken from the Reflection-0.5.{-# LANGUAGE Rank2Types, MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances #-} {-# OPTIONS_GHC -fno-cse -fno-full-laziness -fno-float-in #-}import Control.Applicative import Data.Proxynewtype Zero = Zero Zero deriving (Sho<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/f8e7d79ccfc01502c22f453a8d9532d8?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nMasterofpsi<br \/>\nc++ boost polymorphism assignment-operator typechecking<br \/>\nall. I&#8217;m pretty new to C++, and I&#8217;m writing a small library (mostly for my own projects) in C++. In the process of designing a type hierarchy, I&#8217;ve run into the problem of defining the assignment operator.I&#8217;ve taken the basic approach that was eventually reached in this article, which is that for every class MyClass in a hierarchy derived from a class Base you define two assignment operators like so:class MyClass: public Base { public:MyClass&amp; operator =(MyClass const&amp; rhs);virtual MyClass&amp; operator =(Base const&amp; rhs); };\/\/ automatically<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/i.stack.imgur.com\/D29fm.jpg?s=32&amp;g=1\" \/><br \/>\nMitch Wheat<br \/>\njavascript typechecking<br \/>\nI&#8217;m currently in the creation of a javascript function library. Mainly for my own use, but you can never be sure if someone else ends up using it in their projects, I&#8217;m atleast creating it as if that could happen. Most methods only work if the variables that are p<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/05d11b2c05d336ba355cba940f573b7c?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nSoverman<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/2536bfa26138272ca525d158ae957c49?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nNed<br \/>\njavascript types google-closure-compiler typechecking<br \/>\nI&#8217;m messing around with the type checking in google&#8217;s closure compiler. The type system seems useful, if perhaps not the most sophisticated out there. I&#8217;m happy with most of the limitations, but this one just seems a bit weird.I&#8217;m seeing problems giving type annotations for functions passed as arguments. In particular, if the type of the passed function is itself not fixed. So for example, I&#8217;d like to write code similar to this:\/*** @param {Array} xs* @param {function(*) : boolean} f* @return {Array}*\/ var filter = function (xs, f) {var i, resu<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/78a0a4bb106d07b6c6f33a51988155e3?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nPeter Mortensen<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/fb710534fda446d2286074bb7692e65a?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nViclib<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/a2d07b1a0a6ddcfed5c18ddfafd5a887?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\npek<br \/>\nphp typechecking<br \/>\nIs there any way to force PHP to blow up (error, whatever) if I misspell a variable name? What about if I&#8217;m using an instance of a class an<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/7eabc9e62903777d31620b4c9dd516c6?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\ndeeb<br \/>\nruby class typechecking genetics<br \/>\nOn runtime, my code often come into an undefined method error for the method mate. As far as I can figure, a Person somehow slips through the cracks sometime along the code&#8217;s exucution, and manages not to have an allele assigned to it.Code (disclaimer, not the best formatted):class Alleleattr_accessor :c1, :c2def initialize(c1, c2)@c1 = c1@c2 = c2end#formats it to be readabledef to_sc1.to_s + c2.to_send#given Allele adef combine(a)pick = rand(4)case pickwhen 0Allele.new(c1,a.c1)when 1Allele.new(c1,a.c2)when 2Allele.new(c2,a.c1)when 3Allele.new(c2,a.c2)endend endclass<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/224884ff0b79e700e516e24fbcae6423?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nNathan Kleyn<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/40011e8a78e2d0498d4b38389b2fe07d?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nfish2000<br \/>\npython validation numpy introspection typechecking<br \/>\nI want to test an unknown value against the constraints that a given NumPy dtype implies &#8212; e.g., if I have an integer value, is it small enough to fit in a uint8?As best I can ascertain, NumPy&#8217;s dtype architecture doesn&#8217;t offer a way to do something like this:### FICTIONAL NUMPY CODE: I made this up ### try:numpy.uint8.validate(rupees) except nump<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/24b1c064f1b7992462d2fbd5137d12e2?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nDavorak<br \/>\nhaskell dynamic-loading typechecking ghc-api<br \/>\nI have the following code that uses the GHC API to load modules and get the type of an expression:typeObjects :: [String] -&gt; [String] -&gt; IO [Type] typeObjects modules objects = dodefaultErrorHandler defaultDynFlags $ dorunGhc (Just libdir) $<\/li>\n<\/ul>\n<p id=\"rop\"><small>Originally posted 2013-11-09 20:19:30. <\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>Nathan Kleyn debugging haskell types typechecking compress xs@(_:_:_) = (ifte ((==) head head.tail) ((compress.).(:) head tail.tail) ((:) head compress.tail) ) xsResults in a type error, but I can&#8217;t see why. It should be equivalent tocompress xs@(_:_:_) = (ifte (((==) head head.tail) xs) (((compress.).(:) he Eric reflection haskell typechecking This is a minimal example taken from [&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-532","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/532","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=532"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/532\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=532"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=532"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=532"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}