LLVM  9.0.0svn
IPDBEnumChildren.h
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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 <cassert>
13 #include <cstdint>
14 #include <memory>
15 
16 namespace llvm {
17 namespace pdb {
18 
19 template <typename ChildType> class IPDBEnumChildren {
20 public:
21  using ChildTypePtr = std::unique_ptr<ChildType>;
23 
24  virtual ~IPDBEnumChildren() = default;
25 
26  virtual uint32_t getChildCount() const = 0;
27  virtual ChildTypePtr getChildAtIndex(uint32_t Index) const = 0;
28  virtual ChildTypePtr getNext() = 0;
29  virtual void reset() = 0;
30 };
31 
32 template <typename ChildType>
33 class NullEnumerator : public IPDBEnumChildren<ChildType> {
34  virtual uint32_t getChildCount() const override { return 0; }
35  virtual std::unique_ptr<ChildType>
36  getChildAtIndex(uint32_t Index) const override {
37  return nullptr;
38  }
39  virtual std::unique_ptr<ChildType> getNext() override {
40  return nullptr;
41  }
42  virtual void reset() override {}
43 };
44 
45 } // end namespace pdb
46 } // end namespace llvm
47 
48 #endif // LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H
std::unique_ptr< IPDBDataStream > ChildTypePtr
This class represents lattice values for constants.
Definition: AllocatorList.h:23
virtual ChildTypePtr getChildAtIndex(uint32_t Index) const =0
virtual uint32_t getChildCount() const =0
virtual ~IPDBEnumChildren()=default
virtual ChildTypePtr getNext()=0