/* 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

class cmFileTimeComparisonInternal;

/** \class cmFileTimeComparison
 * \brief Helper class for comparing file modification times.
 *
 * Compare file modification times or test if file modification times differ.
 */
class cmFileTimeComparison
{
public:
    cmFileTimeComparison();
    ~cmFileTimeComparison();

    /**
     *  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(const char* f1, const char* f2, int* result);

    /**
     *  Compare file modification times.  Return true unless both files
     *  exist and have modification times less than 1 second apart.
     */
    bool FileTimesDiffer(const char* f1, const char* f2);

protected:
    cmFileTimeComparisonInternal* Internals;
};

#endif
