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>; 22 using MyType = IPDBEnumChildren<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> { getChildCount()34 virtual uint32_t getChildCount() const override { return 0; } 35 virtual std::unique_ptr<ChildType> getChildAtIndex(uint32_t Index)36 getChildAtIndex(uint32_t Index) const override { 37 return nullptr; 38 } getNext()39 virtual std::unique_ptr<ChildType> getNext() override { 40 return nullptr; 41 } reset()42 virtual void reset() override {} 43 }; 44 45 } // end namespace pdb 46 } // end namespace llvm 47 48 #endif // LLVM_DEBUGINFO_PDB_IPDBENUMCHILDREN_H 49