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 // ct_lvtclp_visitlog.h                                                -*-C++-*-
 
 /*
 // Copyright 2023 Codethink Ltd <codethink@codethink.co.uk>
 // SPDX-License-Identifier: Apache-2.0
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 */
 
 #ifndef INCLUDED_CT_LVTCLP_VISITLOG
 #define INCLUDED_CT_LVTCLP_VISITLOG
 
 //@PURPOSE: Remember which `clang::Decl`s we have already visited
 //
 //@CLASSES:
 //  lvtclp::VisitLog: Not for use outside lvtclp
 //
 //@SEE_ALSO: lvtclp::CodebaseDbVisitor
 //
 //@DESCRIPTION:
 //  CodebaseDbVistor consists of callbacks for different clang::Decl kinds.
 //  Each callback is for a particular clang::SourceLocation. We can skip any
 //  decls we have already seen (e.g. in a header file). The tuple
 //  <Decl::Kind, SourceLocation, templateKind> uniquely identifies the callback.
 //  We need the Decl::Kind because we can have multiple callbacks for the same
 //  source location e.g. VisitFunctionDecl and VisitMethodDecl.
 //  We need the templateKind because clang will give us callbacks for each
 //  specialization.
 
 #include <memory>
 
 #include <clang/AST/DeclBase.h>
 
 namespace Codethink::lvtclp {
 
 // ==============================
 // class VisitLog
 // ==============================
 
 class VisitLog {
     // Store which decl callbacks we have already processed
 
     // PRIVATE TYPES
     struct Private;
 
     // DATA
     std::unique_ptr<Private> d;
 
   public:
     // CREATORS
     VisitLog();
 
     ~VisitLog() noexcept;
 
     // MANIPULATORS
     bool alreadyVisited(const clang::Decl *decl, clang::Decl::Kind kind, int templateKind = -1);
     // Returns if we have already visited this decl.
     // If we haven't already visited this decl, it is now considered visited
 };
 
 } // end namespace Codethink::lvtclp
 
 #endif