c++ - Boost.TTI not working with Clang -

-

boost 1.54 added new library, boost.tti type traits introspection. following code using has_template functionality, works on g++ not on clang

#include <boost/tti/has_template.hpp>  boost_tti_has_template(template1) boost_tti_has_template(template2) boost_tti_has_template(template3)  struct top {   template <class x> struct template1 { };   template <typename a,typename b,typename c> class template2 { };   template <typename a,typename b,typename c,int d> class template3 { }; };  int main() {     static_assert( has_template_template1<top>::value, ""); // true     static_assert( has_template_template2<top>::value, ""); // true     static_assert(!has_template_template3<top>::value, ""); // false, not typename/class template parameters }

live example.

question: why doesn't code compile on clang? according boost.tti docs, support variadic macros required, clang has been supporting since 2.9.

boost_tti_has_template uses variadic macros boost.preprocessor. the maintainer of library not want depend on boost.config , believes macro config defines not "strong enough" preprocessor metaprogramming library.. these reasons use of variadic versions of boost_tti_has_template depends on whether boost_pp_variadics defined. sadly, code automatically determining if compiler has variadic macro support out of date , not include clang amongst compilers variadic support on. recommended workaround defining boost_pp_variadics=1.

apparently has been solved in trunk, , may possibly included in future release.


Comments

Post a Comment

Popular posts from this blog

c++ - How to add Crypto++ library to Qt project -

-
Image
i downloaded crypto++ source , compiled cryptlib project in visual studio 2013, , added generated .lib file qt project, made .pro file this: qt += core gui qt += sql greaterthan(qt_major_version, 4):qt += widgets target = untitled template = app sources += main.cpp\ mainwindow.cpp headers += mainwindow.h \ databasecontrol.h \ test.h forms += mainwindow.ui win32:config(release, debug|release): libs += -l$$pwd/ -lcryptlib else:win32:config(debug, debug|release): libs += -l$$pwd/ -lcryptlibd else:unix: libs += -l$$pwd/ -lcryptlib includepath += $$pwd/ dependpath += $$pwd/ win32-g++:config(release, debug|release): pre_targetdeps += $$pwd/libcryptlib.a else:win32-g++:config(debug, debug|release): pre_targetdeps += $$pwd/libcryptlibd.a else:win32:!win32-g++:config(release, debug|release): pre_targetdeps += $$pwd/cryptlib.lib else:win32:!win32-g++:config(debug, debug|release): pre_targetdeps += $$pwd/cryptlibd.lib else:unix: pre_targetdeps += $$pw
Read more

jQuery Mobile app not scrolling in Firefox -

-
i have mobile app built in jquery mobile. scrolling fine in chrome & safari, fails scroll in firefox on desktop. have other instances of same app, different features, , works across browsers. life of me, cannot figure this, please help! located here: http://re-brand.us/dsus/index.html seems bug in firefox: bug log . able scroll using keyboard not trackpad on mac. are using mac? i'll keep looking see if can find way around it.
Read more

How to use vim as editor in Matlab GUI -

-
i using matlab r2013b. using gui, command windows , editor in split screen. in matlab preferences > editor/debugger > editor. there option set custom editor instead of matlab editor. set local editor /usr/bin/vim , not able open files @ anymore. there possibility use vim editor in split screen mode? i aware of !vim file.m , not solution looking for, works satisfactory in -nodisplay mode. rather want keep split screen mode. i did not find solution 100% satisfying, using tmux intermediate solution. allows 2 use split screen 2 terminals. in 1 of can open matlab -nodesktop in terminal mode, , in other 1 vim . possible switch between both split screens. you can use functionality of gui matlab typing things commandhistory , who et cetera.
Read more