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53 lines
1.4 KiB
C++
53 lines
1.4 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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#ifndef cmFileTimeCache_h
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#define cmFileTimeCache_h
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#include "cmConfigure.h" // IWYU pragma: keep
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#include "cmFileTime.h"
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#include <string>
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#include <unordered_map>
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/** \class cmFileTimeCache
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* \brief Caches file modification times in an internal map for fast lookups.
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*/
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class cmFileTimeCache
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{
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public:
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cmFileTimeCache();
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~cmFileTimeCache();
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cmFileTimeCache(const cmFileTimeCache&) = delete;
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cmFileTimeCache& operator=(const cmFileTimeCache&) = delete;
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/**
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* @brief Loads the file time from the cache or the file system.
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* @return true on success
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*/
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bool Load(std::string const& fileName, cmFileTime& fileTime);
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/**
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* @brief Compare file modification times.
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* @return true for successful comparison and false for error.
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*
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* When true is returned, result has -1, 0, +1 for
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* f1 older, same, or newer than f2.
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*/
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bool FileTimeCompare(std::string const& f1, std::string const& f2,
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int* result);
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/**
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* @brief Compare file modification times.
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* @return true unless both files exist and have modification times less
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* than 1 second apart.
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*/
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bool FileTimesDiffer(std::string const& f1, std::string const& f2);
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private:
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typedef std::unordered_map<std::string, cmFileTime> FileTimeMap;
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FileTimeMap FileTimes;
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};
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#endif
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