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bdca8b01d2
#pragma once is a widely supported compiler pragma, even though it is not part of the C++ standard. Many of the issues keeping #pragma once from being standardized (distributed filesystems, build farms, hard links, etc.) do not apply to CMake - it is easy to build CMake on a single machine. CMake also does not install any header files which can be consumed by other projects (though cmCPluginAPI.h has been deliberately omitted from this conversion in case anyone is still using it.) Finally, #pragma once has been required to build CMake since at least August 2017 (7f29bbe6 enabled server mode unconditionally, which had been using #pragma once since September 2016 (b13d3e0d)). The fact that we now require C++11 filters out old compilers, and it is unlikely that there is a compiler which supports C++11 but does not support #pragma once.
73 lines
2.1 KiB
C++
73 lines
2.1 KiB
C++
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#pragma once
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#include <map>
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#include <set>
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#include <string>
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#include <utility>
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#include "cmLinkItem.h"
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class cmGeneratorTarget;
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/** \class cmLinkItemGraphVisitor
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* \brief Visits a graph of linked items.
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*
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* Allows to visit items and dependency links (direct and indirect) between
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* those items.
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* This abstract class takes care of the graph traversal, making sure that:
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* - it terminates even in the presence of cycles;
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* - it visits every object once (and only once);
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* - it visits the objects in the same order every time.
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*
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* Children classes only have to implement OnItem() etc. to handle whatever
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* logic they care about.
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*/
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class cmLinkItemGraphVisitor
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{
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public:
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virtual ~cmLinkItemGraphVisitor() = default;
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virtual void VisitGraph(std::string const& name) = 0;
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void VisitItem(cmLinkItem const& item);
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protected:
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enum class DependencyType
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{
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LinkInterface,
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LinkPublic,
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LinkPrivate,
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Object,
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Utility
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};
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virtual void OnItem(cmLinkItem const& item) = 0;
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virtual void OnDirectLink(cmLinkItem const& depender,
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cmLinkItem const& dependee, DependencyType dt) = 0;
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virtual void OnIndirectLink(cmLinkItem const& depender,
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cmLinkItem const& dependee) = 0;
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private:
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std::set<std::string> VisitedItems;
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std::set<std::pair<std::string, std::string>> VisitedLinks;
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void VisitLinks(cmLinkItem const& item, cmLinkItem const& rootItem);
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void VisitLinks(cmLinkItem const& item, cmLinkItem const& rootItem,
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std::string const& config);
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using Dependency = std::pair<DependencyType, cmLinkItem>;
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using DependencyMap = std::map<std::string, Dependency>;
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bool ItemVisited(cmLinkItem const& item);
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bool LinkVisited(cmLinkItem const& depender, cmLinkItem const& dependee);
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static void GetDependencies(cmGeneratorTarget const& target,
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std::string const& config,
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DependencyMap& dependencies);
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};
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