[llvm-dev] StringSet copy constructor

[Russell Wallace via llvm-dev]

I'm trying to make a string set that has a flag to become the universal
set, and figured StringSet might be a good starting point

struct Selection : StringSet<> {
  bool all;

  Selection(const Selection &selection)
      : StringSet<>(selection), all(selection.all) {}

  Selection(bool all) : all(all) {}

  size_t count(const string &s) const {
    if (all)
      return true;
    return StringSet<>::count(s);
  }
};

But I get an error when trying to compile

error C2280: 'llvm::StringSet<llvm::MallocAllocator>::StringSet(const
llvm::StringSet<llvm::MallocAllocator> &)': attempting to reference a
deleted function
\llvm\include\llvm/ADT/StringSet.h(31): note: compiler has generated
'llvm::StringSet<llvm::MallocAllocator>::StringSet' here

The indicated line is on my constructor declaration - is this not the right
way to copy a StringSet?
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