[llvm-bugs] [Bug 40495] New: is_invokable_v<void> does not compile

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40495

            Bug ID: 40495
           Summary: is_invokable_v<void> does not compile
           Product: libc++
           Version: 7.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alisdairm at me.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

The simple test expression:
  static_assert(!std::is_invokable_v<void>);
is expected to compile, but libc++ rejects this as 'void' is not a complete
type.

According to the standard, the requirements on "Fn" are:

"Fn and all types in the template parameter pack ArgTypes shall be complete
types, cv void, or arrays of unknown bound."

This may be boiler-plate standardese for handling incomplete types that merits
an LWG issue instead, but note that gcc handles this case correctly.

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