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//===- DerivedUser.h - Base for non-IR Users --------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_DERIVEDUSER_H
#define LLVM_IR_DERIVEDUSER_H
#include "llvm/IR/User.h"
namespace llvm {
class Type;
class Use;
/// Extension point for the Value hierarchy. All classes outside of lib/IR
/// that wish to inherit from User should instead inherit from DerivedUser
/// instead. Inheriting from this class is discouraged.
///
/// Generally speaking, Value is the base of a closed class hierarchy
/// that can't be extended by code outside of lib/IR. This class creates a
/// loophole that allows classes outside of lib/IR to extend User to leverage
/// its use/def list machinery.
class DerivedUser : public User {
protected:
using DeleteValueTy = void (*)(DerivedUser *);
private:
friend class Value;
DeleteValueTy DeleteValue;
public:
DerivedUser(Type *Ty, unsigned VK, Use *U, unsigned NumOps,
DeleteValueTy DeleteValue)
: User(Ty, VK, U, NumOps), DeleteValue(DeleteValue) {}
};
} // end namespace llvm
#endif // LLVM_IR_DERIVEDUSER_H
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