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//===- IPDBEnumChildren.h - base interface for child enumerator -*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
#define LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H

#include <cassert>
#include <cstdint>
#include <memory>

namespace llvm {
namespace pdb {

template <typename ChildType> class IPDBEnumChildren {
public:
  using ChildTypePtr = std::unique_ptr<ChildType>;
  using MyType = IPDBEnumChildren<ChildType>;

  virtual ~IPDBEnumChildren() = default;

  virtual uint32_t getChildCount() const = 0;
  virtual ChildTypePtr getChildAtIndex(uint32_t Index) const = 0;
  virtual ChildTypePtr getNext() = 0;
  virtual void reset() = 0;
};

template <typename ChildType>
class NullEnumerator : public IPDBEnumChildren<ChildType> {
  virtual uint32_t getChildCount() const override { return 0; }
  virtual std::unique_ptr<ChildType>
  getChildAtIndex(uint32_t Index) const override {
    return nullptr;
  }
  virtual std::unique_ptr<ChildType> getNext() override {
    return nullptr;
  }
  virtual void reset() override {}
};

} // end namespace pdb
} // end namespace llvm

#endif // LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H