[SG10] No __cpp_concepts in the C++20 draft

Jonathan Wakely cxx at kayari.org
Fri Mar 1 13:21:11 CET 2019


The working draft doesn't specify a __cpp_concepts macro. I want to know if
I need to say "concept bool" or just "concept", so I expected to be able to
do:

#if __cpp_concepts
template<typename T>
  concept
#if __cpp_concepts <= 201507
  bool
#endif
  Foo = ...;
#endif

Should this be handled by a core issue?
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