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From: "yingpo.liao at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/66092] [c++-concepts] Concept can't check variadic template arguments Date: Wed, 13 May 2015 20:22:00 -0000 [thread overview] Message-ID: <bug-66092-4-wilEFXHQcA@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-66092-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66092 --- Comment #1 from Ying-Po Liao <yingpo.liao at gmail dot com> --- Here's another implementation, which results in the same consequence. template <typename T, typename U, typename... Args> struct Checker { constexpr static decltype(auto) check( std::true_type ) { return std::integral_constant<bool, __is_same_as(T, U)>(); } constexpr static decltype(auto) check( std::false_type ) { return std::integral_constant<bool, __is_same_as(T, U) && Checker<U, Args...>::value>(); } constexpr static bool value = decltype( check( std::integral_constant<bool, (sizeof...(Args)==0)>() ) )::value; }; template <typename T, typename U, typename... Args> concept bool Same() { return Checker<T, U, Args...>::value; }
next parent reply other threads:[~2015-05-13 20:22 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <bug-66092-4@http.gcc.gnu.org/bugzilla/> 2015-05-13 20:22 ` yingpo.liao at gmail dot com [this message] 2015-05-19 12:23 ` andrew.n.sutton at gmail dot com 2015-07-10 7:26 ` jason at gcc dot gnu.org 2015-07-14 4:11 ` jason at gcc dot gnu.org 2015-07-17 17:43 ` jason at gcc dot gnu.org 2015-08-04 13:36 ` jason at gcc dot gnu.org
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