https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87452
Bug ID: 87452
Summary: decltype ignores namespace in trailing return type
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: schuchart at hlrs dot de
Target Milestone: ---
Created attachment 44758
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44758&action=edit
Test case
It appears that GCC does not include the namespace in the evaluations of
expressions passed to decltype() in trailing return type definitions.
The attached test-case compiled with GCC 8.2.0 produces the following output:
$ g++-8 gcc_decltype_ret.cc
$ ./a.out
10
fall-back
$ g++-8 --version
g++-8 (Ubuntu 8.2.0-1ubuntu2~18.04) 8.2.0
]]
Compiling with Clang 6.0.1 on the other hand gives the following output:
$ clang++-6.0 gcc_decltype_ret.cc
$ ./a.out
10
0 0 0 0 0 0 0 0 0 0
In other parts of the code, the same decltype() statement that is used in the
trailing return type definition yields the expected type (line 26).
