[llvm-bugs] [Bug 50961] New: Casting.h really needs an isa_or_null<> template!

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50961

            Bug ID: 50961
           Summary: Casting.h really needs an isa_or_null<> template!
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Support Libraries
          Assignee: unassignedbugs at nondot.org
          Reporter: clattner at nondot.org
                CC: llvm-bugs at lists.llvm.org

casting.h provides cast_or_null and dyn_cast_or_null but doesn't have the
corresponding isa_or_null operation that returns true if the value is null or
if it matches the list of types provided.  Folks work around this by using
dyn_cast_or_null in a bool context, but it would be cleaner to just provide
this operation.

I think this is just a "no one has gotten around to it" sort of issue.

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