java - Why usage of prefix incrementation is considered better than postfix incrementation in standard for construction -


i installed checkstyle plugin eclipse , think awesome. 1 of warnings gives me bit obscure. exact warning "using ++ not allowed". postfix ++ in row like

for(int = 0; < something; i++)

ok, 'm aware foreach better construction iteration, can't applied everywhere, old-school ++ alternative.

when change row 

for(int = 0; < something; ++i)

the warning disappears. know difference between i++ , ++i , point of life considered them interchangeable in standard for construction. checkstyle considers i++ harmful (or error prone).

question: why prefix incrementation better postfix incrementation in for constructions? or... checkstyle wrong that?

postfix incrementation makes sense when used in expression need old value prior modification. in void contexts value discarded (as in for loop), saving old value makes no sense.

in other words:

// makes sense because need old value subscript array stack[top++] = x; // in void context, old value discarded top++;

in c++ in particular, both of these operators can overloaded, , implementation of postfix 1 can inefficient because of requirement return old value - involves copying old object comply original semantics of postfix operator.

with primitive types, decent compiler produce identical code both of cases, second 1 better semantic standpoint of language.


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:...
Read more