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From: "yacwroy at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/53585] New: template value parameter of pointer-to-member type incorrectly rejects non-direct values Date: Wed, 06 Jun 2012 01:15:00 -0000 [thread overview] Message-ID: <bug-53585-4@http.gcc.gnu.org/bugzilla/> (raw) http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53585 Bug #: 53585 Summary: template value parameter of pointer-to-member type incorrectly rejects non-direct values Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: yacwroy@gmail.com Created attachment 27561 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27561 c++ testcase - should be legal Problem: Pointer-to-member value parameters appear to only accept direct values (of the immediate form &X::Y) and reject passed constexpr variables. llvm/clang++ accepts these. I'm assuming this is legal but I haven't checked the standard. specs: linux/x64 source (same as attached) ========================= struct SFoo { int x; }; constexpr int SFoo::* G_ptr_to_x = &SFoo::x; // Dummy test struct. template <int SFoo::* P> struct SBar {}; SBar<G_ptr_to_x> G_bar; // <ERROR>. (This should be legal, and is in clang). // Additional testing: SBar<&SFoo::x> G_bar2; // Shows the member-pointer works if immediate. constexpr int SFoo::* another_ptr = G_ptr_to_x; // Shows "could not convert ..." error message is incorrect. int main() {} ========================= Errors (build command = g++ mptr.cpp -std=c++11). ========================= test/misc/mptr.cpp:12:16: error: ‘G_ptr_to_x’ is not a valid template argument for type ‘int SFoo::*’ SBar<G_ptr_to_x> G_bar; // <ERROR>. (This should be legal, and is in clang). ^ test/misc/mptr.cpp:12:16: error: it must be a pointer-to-member of the form ‘&X::Y’ test/misc/mptr.cpp:12:16: error: could not convert template argument ‘G_ptr_to_x’ to ‘int SFoo::*’ test/misc/mptr.cpp:12:23: error: invalid type in declaration before ‘;’ token SBar<G_ptr_to_x> G_bar; // <ERROR>. (This should be legal, and is in clang). =========================
next reply other threads:[~2012-06-06 1:15 UTC|newest] Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-06-06 1:15 yacwroy at gmail dot com [this message] 2012-06-06 7:49 ` [Bug c++/53585] " daniel.kruegler at googlemail dot com 2012-06-06 16:43 ` yacwroy at gmail dot com 2012-06-06 20:07 ` daniel.kruegler at googlemail dot com 2014-07-08 9:02 ` paolo.carlini at oracle dot com
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