Another bug of the day :D<\/p>\n
You can do the following<\/p>\n
float var = float(vari); \/\/ yes I know I'm loosing precision
\nint var = int(std::floor(varf)) \/\/ yes I know interger can overflow
\nint var = qFloor(varf) \/\/ Qt version<\/p>\n
Same for double.<\/p>\n
warning: comparison between signed and unsigned integer expressions [-Wsign-compare]<\/p>\n
Tricky one. Usually don't use unsigned types. The world is full of negative value. Use signed types.
\nExcept for..
\nArray index. To access the full 32\/64bit address space, one must use unsigned type. <\/p>\n
Let variable data be a pointer\/array.
\ndata[i] is the same as data+i
\nNow variable i should have the same wide as data. Which is size_t. Type size_t is 32bit wide on 32bit system and 64bit otherwise.
\nNew rule: Always use size_t for index variable while accessing data. Don't use int.<\/p>\n
Type size_t is an unsiged type.
\nNew rule: Never count backwards in for loops while accessing data.<\/p>\n
Consider this endless loop
\nfor(size_t i=data.size(); i >= 0; i--)<\/p>\n
If i == 0 and i-- then i == 2^32-1 which is > 0. Damn.
\nThere are a lot of solutions. Bad one and really bad ones. Here is my perfect one: You count forward. That is really easy and everybody understands what is going one and there are no surprises.
\nIn the next line you subtract n-i-1 and volia. Perfect.<\/p>\n
for(size_t ri=0; ri < data.size(); ri++) {\n size_t i = data.size() - ri - 1;\n\nI named the new loop variabl ri for reverse iterator. Don't forget to add -1. Arrays start by 0.\nYou can of couse use std::reverse_iterator But hey, I love for loops!\n<\/p>\n","protected":false},"excerpt":{"rendered":"
Another bug of the day :D You can do the following float var = float(vari); \/\/ yes I know I'm loosing precision int var = int(std::floor(varf)) \/\/ yes I know interger can overflow int var = qFloor(varf) \/\/ Qt version Same for double. warning: comparison between signed and unsigned integer expressions [-Wsign-compare] Tricky one. Usually […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[14,17,12],"class_list":["post-2363","post","type-post","status-publish","format-standard","hentry","category-allgemein","tag-c","tag-cpp","tag-qt"],"_links":{"self":[{"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/posts\/2363","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2363"}],"version-history":[{"count":4,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/posts\/2363\/revisions"}],"predecessor-version":[{"id":2367,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=\/wp\/v2\/posts\/2363\/revisions\/2367"}],"wp:attachment":[{"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2363"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2363"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/roboblog.fatal-fury.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}