https://bugs.llvm.org/show_bug.cgi?id=47261
Bug ID: 47261
Summary: <version> header is missing __cpp_lib_type_identity
and other macros
Product: libc++
Version: 11.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: l...@marehr.dialup.fu-berlin.de
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Hi clang-team,
the following code doesn't compile, even thought it can compile
`std::type_identity` and `std::unwrap_reference` just fine since clang 9.0.0.
```c++
#include <type_traits>
using a = std::type_identity<int>; // works fine
using b = std::unwrap_reference_t<int>; // works fine
#ifndef __cpp_lib_type_identity
#error "Not defined?"
#endif
#ifndef __cpp_lib_unwrap_ref
#error "Not defined?"
#endif
```
https://godbolt.org/z/6vaa6x
I thought https://eel.is/c++draft/version.syn suggests that
__cpp_lib_type_identity should be defined if it was implemented.
Thank you!
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