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  1. //===- IPDBEnumChildren.h - base interface for child enumerator -*- C++ -*-===//
  2. //
  3. // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  4. // See https://llvm.org/LICENSE.txt for license information.
  5. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  6. //
  7. //===----------------------------------------------------------------------===//
  8.  
  9. #ifndef LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
  10. #define LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
  11.  
  12. #include "llvm/DebugInfo/CodeView/LazyRandomTypeCollection.h"
  13. #include <cassert>
  14. #include <cstdint>
  15. #include <memory>
  16.  
  17. namespace llvm {
  18. namespace pdb {
  19.  
  20. template <typename ChildType> class IPDBEnumChildren {
  21. public:
  22.   using ChildTypePtr = std::unique_ptr<ChildType>;
  23.   using MyType = IPDBEnumChildren<ChildType>;
  24.  
  25.   virtual ~IPDBEnumChildren() = default;
  26.  
  27.   virtual uint32_t getChildCount() const = 0;
  28.   virtual ChildTypePtr getChildAtIndex(uint32_t Index) const = 0;
  29.   virtual ChildTypePtr getNext() = 0;
  30.   virtual void reset() = 0;
  31. };
  32.  
  33. template <typename ChildType>
  34. class NullEnumerator : public IPDBEnumChildren<ChildType> {
  35.   uint32_t getChildCount() const override { return 0; }
  36.   std::unique_ptr<ChildType> getChildAtIndex(uint32_t Index) const override {
  37.     return nullptr;
  38.   }
  39.   std::unique_ptr<ChildType> getNext() override { return nullptr; }
  40.   void reset() override {}
  41. };
  42.  
  43. } // end namespace pdb
  44. } // end namespace llvm
  45.  
  46. #endif // LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
  47.