text: //===--- UnusedAliasDeclsCheck.h - clang-tidy--------------------*- 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_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_ALIAS_DECLS_H
  #define LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_ALIAS_DECLS_H
  
  #include "../ClangTidyCheck.h"
  #include "llvm/ADT/DenseMap.h"
  
  namespace clang {
  namespace tidy {
  namespace misc {
  
  /// Finds unused namespace alias declarations.
  class UnusedAliasDeclsCheck : public ClangTidyCheck {
  public:
    UnusedAliasDeclsCheck(StringRef Name, ClangTidyContext *Context)
        : ClangTidyCheck(Name, Context) {}
    bool isLanguageVersionSupported(const LangOptions &LangOpts) const override {
      return LangOpts.CPlusPlus11;
    }
    void registerMatchers(ast_matchers::MatchFinder *Finder) override;
    void check(const ast_matchers::MatchFinder::MatchResult &Result) override;
    void onEndOfTranslationUnit() override;
  
  private:
    llvm::DenseMap<const NamedDecl *, CharSourceRange> FoundDecls;
  };
  
  } // namespace misc
  } // namespace tidy
  } // namespace clang
  
  #endif // LLVM_CLANG_TOOLS_EXTRA_CLANG_TIDY_MISC_UNUSED_ALIAS_DECLS_H
  