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131 lines
3.0 KiB
131 lines
3.0 KiB
5 years ago
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/* 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 cmFileTime_h
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#define cmFileTime_h
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#include "cmConfigure.h" // IWYU pragma: keep
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#include <string>
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/** \class cmFileTime
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* \brief Abstract file modification time with support for comparison with
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* other file modification times.
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*/
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class cmFileTime
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{
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public:
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typedef long long NSC;
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static constexpr NSC NsPerS = 1000000000;
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cmFileTime() = default;
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~cmFileTime() = default;
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/**
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* @brief Loads the file time of fileName from 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);
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/**
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* @brief Return true if this is older than ftm
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*/
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bool Older(cmFileTime const& ftm) const { return (this->NS - ftm.NS) < 0; }
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/**
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* @brief Return true if this is newer than ftm
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*/
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bool Newer(cmFileTime const& ftm) const { return (ftm.NS - this->NS) < 0; }
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/**
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* @brief Return true if this is the same as ftm
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*/
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bool Equal(cmFileTime const& ftm) const { return this->NS == ftm.NS; }
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/**
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* @brief Return true if this is not the same as ftm
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*/
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bool Differ(cmFileTime const& ftm) const { return this->NS != ftm.NS; }
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/**
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* @brief Compare file modification times.
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* @return -1, 0, +1 for this older, same, or newer than ftm.
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*/
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int Compare(cmFileTime const& ftm) const
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{
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NSC const diff = this->NS - ftm.NS;
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if (diff == 0) {
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return 0;
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}
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return (diff < 0) ? -1 : 1;
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}
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// -- Comparison in second resolution
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/**
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* @brief Return true if this is at least a second older than ftm
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*/
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bool OlderS(cmFileTime const& ftm) const
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{
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return (ftm.NS - this->NS) >= cmFileTime::NsPerS;
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}
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/**
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* @brief Return true if this is at least a second newer than ftm
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*/
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bool NewerS(cmFileTime const& ftm) const
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{
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return (this->NS - ftm.NS) >= cmFileTime::NsPerS;
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}
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/**
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* @brief Return true if this is within the same second as ftm
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*/
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bool EqualS(cmFileTime const& ftm) const
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{
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NSC diff = this->NS - ftm.NS;
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if (diff < 0) {
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diff = -diff;
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}
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return (diff < cmFileTime::NsPerS);
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}
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/**
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* @brief Return true if this is older or newer than ftm by at least a second
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*/
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bool DifferS(cmFileTime const& ftm) const
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{
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NSC diff = this->NS - ftm.NS;
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if (diff < 0) {
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diff = -diff;
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}
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return (diff >= cmFileTime::NsPerS);
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}
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/**
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* @brief Compare file modification times.
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* @return -1: this at least a second older, 0: this within the same second
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* as ftm, +1: this at least a second newer than ftm.
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*/
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int CompareS(cmFileTime const& ftm) const
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{
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NSC const diff = this->NS - ftm.NS;
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if (diff <= -cmFileTime::NsPerS) {
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return -1;
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}
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if (diff >= cmFileTime::NsPerS) {
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return 1;
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}
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return 0;
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}
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/**
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* @brief The file modification time in nanoseconds
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*/
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NSC GetNS() const { return this->NS; }
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private:
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NSC NS = 0;
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};
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#endif
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