DebugInfo/PDB/IPDBEnumChildren.h

0001 //===- IPDBEnumChildren.h - base interface for child enumerator -*- C++ -*-===//
0002 //
0003 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0004 // See https://llvm.org/LICENSE.txt for license information.
0005 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0006 //
0007 //===----------------------------------------------------------------------===//
0008
0009 #ifndef LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
0010 #define LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
0011
0012 #include "llvm/DebugInfo/CodeView/LazyRandomTypeCollection.h"
0013 #include <cassert>
0014 #include <cstdint>
0015 #include <memory>
0016
0017 namespace llvm {
0018 namespace pdb {
0019
0020 template <typename ChildType> class IPDBEnumChildren {
0021 public:
0022   using ChildTypePtr = std::unique_ptr<ChildType>;
0023   using MyType = IPDBEnumChildren<ChildType>;
0024
0025   virtual ~IPDBEnumChildren() = default;
0026
0027   virtual uint32_t getChildCount() const = 0;
0028   virtual ChildTypePtr getChildAtIndex(uint32_t Index) const = 0;
0029   virtual ChildTypePtr getNext() = 0;
0030   virtual void reset() = 0;
0031 };
0032
0033 template <typename ChildType>
0034 class NullEnumerator : public IPDBEnumChildren<ChildType> {
0035   uint32_t getChildCount() const override { return 0; }
0036   std::unique_ptr<ChildType> getChildAtIndex(uint32_t Index) const override {
0037     return nullptr;
0038   }
0039   std::unique_ptr<ChildType> getNext() override { return nullptr; }
0040   void reset() override {}
0041 };
0042
0043 } // end namespace pdb
0044 } // end namespace llvm
0045
0046 #endif // LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H