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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#ifndef cmFileTimeComparison_h
#define cmFileTimeComparison_h
#include "cmConfigure.h" // IWYU pragma: keep
#include "cmFileTime.h"
#include <string>
class cmFileTimeComparisonInternal;
/** \class cmFileTimeComparison
* \brief Caches file modification times in an internal map for fast lookups.
*/
class cmFileTimeComparison
{
public:
cmFileTimeComparison();
~cmFileTimeComparison();
cmFileTimeComparison(const cmFileTimeComparison&) = delete;
cmFileTimeComparison& operator=(const cmFileTimeComparison&) = delete;
/**
* @brief Loads the file time from the cache or the file system.
* @return true on success
*/
bool Load(std::string const& fileName, cmFileTime& fileTime);
/**
* @brief Compare file modification times.
* @return true for successful comparison and false for error.
*
* When true is returned, result has -1, 0, +1 for
* f1 older, same, or newer than f2.
*/
bool FileTimeCompare(std::string const& f1, std::string const& f2,
int* result);
/**
* @brief Compare file modification times.
* @return true unless both files exist and have modification times less
* than 1 second apart.
*/
bool FileTimesDiffer(std::string const& f1, std::string const& f2);
protected:
cmFileTimeComparisonInternal* Internals;
};
#endif
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