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Updated Examples and Recipes (markdown)

Howard Hinnant
2020-04-26 15:12:09 -04:00
parent 41394ea406
commit 03d3bfb0c7
1 changed files with 14 additions and 10 deletions
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24
Examples-and-Recipes.md

@@ -1738,27 +1738,31 @@ FILETIME system_clock_to_FILETIME(system_clock::time_point systemPoint) {
std::chrono::system_clock::time_point
to_system_clock(boost::posix_time::ptime const& pt)
{
using namespace std::chrono;
auto const dt = pt - boost::posix_time::from_time_t(0);
using namespace std;
using namespace boost;
auto const dt = pt - posix_time::from_time_t(0);
#ifdef BOOST_DATE_TIME_HAS_NANOSECONDS
std::chrono::nanoseconds ns{dt.total_nanoseconds()};
return system_clock::time_point{duration_cast<system_clock::duration>(ns)};
chrono::nanoseconds ns{dt.total_nanoseconds()};
auto sysd = chrono::duration_cast<chrono::system_clock::duration>(ns);
return chrono::system_clock::time_point{sysd};
#else
std::chrono::microseconds us{dt.total_microseconds()};
return system_clock::time_point{us};
chrono::microseconds us{dt.total_microseconds()};
return chrono::system_clock::time_point{us};
#endif
}
boost::posix_time::ptime
to_ptime(std::chrono::system_clock::time_point const& st)
{
using namespace std::chrono;
using namespace std;
using namespace boost;
#ifdef BOOST_DATE_TIME_HAS_NANOSECONDS
posix_time::nanoseconds fs{nanoseconds{st.time_since_epoch()}.count()};
posix_time::nanoseconds fs{
chrono::nanoseconds{st.time_since_epoch()}.count()};
#else
posix_time::microseconds fs{duration_cast<microseconds>(
st.time_since_epoch()).count()};
posix_time::microseconds fs{
chrono::duration_cast<chrono::microseconds>(
st.time_since_epoch()).count()};
#endif
return posix_time::from_time_t(0) + fs;
}