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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file LICENSE.rst or https://cmake.org/licensing for details. */
#pragma once
#include "cmConfigure.h" // IWYU pragma: keep
#include <string>
/** \class cmFileTime
* \brief Abstract file modification time with support for comparison with
* other file modification times.
*/
class cmFileTime
{
public:
using TimeType = long long;
// unit time per second
#if !defined(_WIN32) || defined(__CYGWIN__)
// unit time is one nanosecond
static constexpr TimeType UtPerS = 1000000000;
#else
// unit time is 100 nanosecond
static constexpr TimeType UtPerS = 10000000;
#endif
/**
* @brief Loads the file time of fileName from the file system
* @return true on success
*/
bool Load(std::string const& fileName);
/**
* @brief Return true if this is older than ftm
*/
bool Older(cmFileTime ftm) const { return (this->Time - ftm.Time) < 0; }
/**
* @brief Return true if this is newer than ftm
*/
bool Newer(cmFileTime ftm) const { return (ftm.Time - this->Time) < 0; }
/**
* @brief Return true if this is the same as ftm
*/
bool Equal(cmFileTime ftm) const { return this->Time == ftm.Time; }
/**
* @brief Return true if this is not the same as ftm
*/
bool Differ(cmFileTime ftm) const { return this->Time != ftm.Time; }
/**
* @brief Compare file modification times.
* @return -1, 0, +1 for this older, same, or newer than ftm.
*/
int Compare(cmFileTime ftm) const
{
TimeType const diff = this->Time - ftm.Time;
if (diff == 0) {
return 0;
}
return (diff < 0) ? -1 : 1;
}
// -- Comparison in second resolution
/**
* @brief Return true if this is at least a second older than ftm
*/
bool OlderS(cmFileTime ftm) const
{
return (ftm.Time - this->Time) >= cmFileTime::UtPerS;
}
/**
* @brief Return true if this is at least a second newer than ftm
*/
bool NewerS(cmFileTime ftm) const
{
return (this->Time - ftm.Time) >= cmFileTime::UtPerS;
}
/**
* @brief Return true if this is within the same second as ftm
*/
bool EqualS(cmFileTime ftm) const
{
TimeType diff = this->Time - ftm.Time;
if (diff < 0) {
diff = -diff;
}
return (diff < cmFileTime::UtPerS);
}
/**
* @brief Return true if this is older or newer than ftm by at least a second
*/
bool DifferS(cmFileTime ftm) const
{
TimeType diff = this->Time - ftm.Time;
if (diff < 0) {
diff = -diff;
}
return (diff >= cmFileTime::UtPerS);
}
/**
* @brief Compare file modification times.
* @return -1: this at least a second older, 0: this within the same second
* as ftm, +1: this at least a second newer than ftm.
*/
int CompareS(cmFileTime ftm) const
{
TimeType const diff = this->Time - ftm.Time;
if (diff <= -cmFileTime::UtPerS) {
return -1;
}
if (diff >= cmFileTime::UtPerS) {
return 1;
}
return 0;
}
/**
* @brief The file modification time in unit time per second
*/
TimeType GetTime() const { return this->Time; }
private:
TimeType Time = 0;
};
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