Hello, it seems that it's not possible to use constexpr with some enums
(mostly present in directx headers)
For example:
constexpr DWRITE_FONT_SIMULATIONS
simulations = DWRITE_FONT_SIMULATIONS_BOLD |
DWRITE_FONT_SIMULATIONS_OBLIQUE;
That works in MSVC with the Windows SDK, while with CLang I get:
error: constexpr variable 'simulations' must be initialized by a constant
expression
note: non-constexpr function 'operator|' cannot be used in a constant
expression
D:/msys64/clang64/include/dwrite.h:404:1: note: declared here
404 | DEFINE_ENUM_FLAG_OPERATORS(DWRITE_FONT_SIMULATIONS);
| ^
D:/msys64/clang64/include/winnt.h:697:17: note: expanded from macro
'DEFINE_ENUM_FLAG_OPERATORS'
697 | inline ENUMTYPE operator | (ENUMTYPE a, ENUMTYPE b) { return
ENUMTYPE(((int)a) | ((int)b)); } \
| ^
Would it be possible to support constexpr in mingw-w64 headers? See also
https://walbourn.github.io/modern-c++-bitmask-types/
Thanks in advance!
Luca
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