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From: "info@ebner-markus.de" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/103747] New: Passing parameter pack expansion to alias template with one argument fails as function return type Date: Thu, 16 Dec 2021 12:01:21 +0000 [thread overview] Message-ID: <bug-103747-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103747 Bug ID: 103747 Summary: Passing parameter pack expansion to alias template with one argument fails as function return type Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: info@ebner-markus.de Target Milestone: --- GCC: 11.2 / trunk CLANG: 13 The following code does not compile with GCC, but compiles fine with clang: https://godbolt.org/z/vP5YMKqKe #include <array> template<template <typename...> typename TClass, typename... TArgs> TClass<TArgs...> factory() { return TClass<TArgs...>(); } template<typename TItem> using FixedSize5Array = std::array<TItem, 5>; int main() { auto arr = factory<FixedSize5Array, int>(); return 0; } Changing the alias template to the following, makes the code compile with GCC, but not with clang: https://godbolt.org/z/r45Ydx65q template<typename... TItem> using FixedSize5Array = std::array<TItem..., 5>; To get it to compile with both compilers, take the first version, and replace the explicit return type of factory() with auto: https://godbolt.org/z/WjYrWbq18
next reply other threads:[~2021-12-16 12:01 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-16 12:01 info@ebner-markus.de [this message] 2021-12-16 12:21 ` [Bug c++/103747] " pinskia at gcc dot gnu.org
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