c++ - C++14 variadic template argument inference in clang and gcc -


i using clang 3.5.0 , gcc version 4.9.2 (both c++14 options on, although trailing return types done in c++11).

the following code compiles in g++ , not in clang++. question "which right?"

#include <iostream> #include <tuple> #include <functional> using namespace std;  template<typename op, typename f1, typename... fs> struct symop {      op op;      tuple<f1,fs...> fs;       symop(const op &oopp, const f1 &f1, const fs &...ffss)           : op(oopp), fs(f1,ffss...) {} };  template<typename op, typename... fs> auto baz(const symop<op,fs...> &so) {      return so.op(get<0>(so.fs),get<1>(so.fs)); }  /* // version compiles on both compilers template<typename op, typename f1, typename... fs> auto baz(const symop<op,f1,fs...> &so) {      return so.op(get<0>(so.fs),get<1>(so.fs)); } */  int main() {      symop<plus<int>,int,int> so{plus<int>{},3,4};      cout << baz(so) << endl; }

clang reports

q.cpp:29:10: error: no matching function call 'baz'         cout << baz(so) << endl;                 ^~~ q.cpp:16:6: note: candidate template ignored: couldn't infer template argument       'op' auto baz(const symop<op,fs...> &so) {      ^

you should understand clang still experimental (even though "widely" used), , built upon gcc (trough has significant changes) , can sure (talking c++ code) compiled in gcc should compile in clang, , if not, clang bug.

gcc had it's time prove being robust.


Comments

Post a Comment

Popular posts from this blog

javascript - Bootstrap Popover: iOS Safari strange behaviour -

i looking through twitter bootstrap documentation, , i'm interested in implementing dismissible popover when button clicked. here example bootstrap's docs: http://getbootstrap.com/javascript/#dismiss-on-next-click when press "dismissible popover" button os x safari browser works fine. when access same link above ios safari, button not work. is, popover not dismissed on click. why button not working ios safari? the example linked using data-trigger="focus" attribute. try changing data-trigger="click" . <a tabindex="0" class="btn btn-lg btn-danger" role="button" data-toggle="popover" data-trigger="click" title="dismissible popover" data-content="and here's amazing content. it's engaging. right?">dismissible popover</a>
Read more

Magento/PHP - Get phones on all members in a customer group -

i working on custom magento extension. working around adminhtml part , i've created custom form there. here form code: <?php class vivasindustries_smsnotification_block_adminhtml_sms_sendmass_edit_form extends mage_adminhtml_block_widget_form { public function _preparelayout() { $extensionpath = mage::getmoduledir('js', 'vivasindustries_smsnotification'); $head = $this->getlayout()->getblock('head'); $head->addjs('jquery.js'); $head->addjs('vivas.js'); return parent::_preparelayout(); } protected function _prepareform() { $form = new varien_data_form(array( 'id' => 'edit_form', 'action' => $this->geturl('*/*/save', array('id' => $this->getrequest()->get...
Read more

session - Logging Out Using PHP -

i have seen other programs regarding can't seem make work. doing wrong? want achieve after user logged out, going previous pages become restricted. i have 3 php files: 1. sample.php - main page username , password filled in 2. successful.php - user's page after logging in 3. logout.php - destorys session hinder user access pages after logging out sample.php </html> <form action="" method="post"> <table> <tr> <td>username:</td> <td>password:</td> </tr> <tr> <td><input type="text" name="username"></td> <td><input type="password" name="password"></td> </tr> <tr> <td><input type="submit" value="submit" name="submit"></td> </tr> </table> </form> </html> <?php $servername = "localhost"; $username = ...
Read more