https://bugs.llvm.org/show_bug.cgi?id=47814
Bug ID: 47814
Summary: clang rejects definition of iterator in -std=c++2a
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++2a
Assignee: unassignedclangb...@nondot.org
Reporter: tangyix...@mail.dlut.edu.cn
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
Hi, the following code definition of iterator 'a' of struct 'S2'. Although it
is invalid use of 'S2' in ISO C++17 and before, maybe it is valid in C++20 and
gcc also accepts it with -std=c++20.
$ s.cpp
template < class T > struct S1 {};
template < class T > struct S2 {
friend class :: S1 < T >;
S2 <T>::iterator a;
};
$ clang++ -c -std=c++20 s.cpp
s.cpp:4:17: error: no type named 'iterator' in 'S2<T>'
S2 <T>::iterator a;
~~~~~~~~^
1 error generated.
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