From Newsgroup: comp.lang.c

#pragma once
#include <cstdint>
#include <chrono>
#if defined(_WIN32)
#include <Windows.h>
#elif defined(__unix__)
#include <time.h>
#else
#error dasdasd
#endif

struct win_time
{
using rep = int64_t;
using period = std::ratio<1, 10000000>;
using duration = std::chrono::duration<rep, period>;
using time_point = std::chrono::time_point<win_time, duration>;
static time_point now() noexcept;
static constexpr bool is_steady = true;
private:
static constexpr int64_t UNIX_START = 116444736000000000;
};

inline win_time::time_point win_time::now() noexcept
{
#if defined(_WIN32)
FILETIME ft;
GetSystemTimePreciseAsFileTime( &ft );
return time_point( duration( (uint64_t)ft.dwHighDateTime << 32 | ft.dwLowDateTime ) );
#elif defined(__unix__)
timespec ts;
clock_gettime( CLOCK_REALTIME, &ts );
return time_point( duration( UNIX_START + (uint64_t)ts.tv_sec * 10'000'000u + ((uint64_t)ts.tv_nsec + 50u) / 100u ) );
#endif
}

What does this do ?
--- Synchronet 3.21a-Linux NewsLink 1.2

From Newsgroup: comp.lang.c

Oh, wrong group.

Am 07.09.2025 um 18:57 schrieb Bonita Montero:

#pragma once
#include <cstdint>
#include <chrono>
#if defined(_WIN32)
    #include <Windows.h>
#elif defined(__unix__)
    #include <time.h>
#else
    #error dasdasd
#endif

struct win_time
{
    using rep = int64_t;
    using period = std::ratio<1, 10000000>;
    using duration = std::chrono::duration<rep, period>;
    using time_point = std::chrono::time_point<win_time, duration>;
    static time_point now() noexcept;
    static constexpr bool is_steady = true;
private:
    static constexpr int64_t UNIX_START = 116444736000000000;
};

inline win_time::time_point win_time::now() noexcept
{
#if defined(_WIN32)
    FILETIME ft;
    GetSystemTimePreciseAsFileTime( &ft );
    return time_point( duration( (uint64_t)ft.dwHighDateTime << 32 | ft.dwLowDateTime ) );
#elif defined(__unix__)
    timespec ts;
    clock_gettime( CLOCK_REALTIME, &ts );
    return time_point( duration( UNIX_START + (uint64_t)ts.tv_sec * 10'000'000u + ((uint64_t)ts.tv_nsec + 50u) / 100u ) );
#endif
}

What does this do ?

#pragma once
#include <cstdint>
#include <chrono>
#if defined(_WIN32)
#include <Windows.h>
#elif defined(__unix__)
#include <time.h>
#else
#error dasdasd
#endif

struct win_time
{
using rep = int64_t;
using period = std::ratio<1, 10000000>;
using duration = std::chrono::duration<rep, period>;
using time_point = std::chrono::time_point<win_time, duration>;
static time_point now() noexcept;
static constexpr bool is_steady = false;
private:
static constexpr time_point UNIX_START = time_point( duration( 116444736000000000 ) );
};

inline win_time::time_point win_time::now() noexcept
{
#if defined(_WIN32)
FILETIME ft;
GetSystemTimePreciseAsFileTime( &ft );
return time_point( duration( (uint64_t)ft.dwHighDateTime << 32 | ft.dwLowDateTime ) );
#elif defined(__unix__)
using namespace std::chrono;
timespec ts;
clock_gettime( CLOCK_REALTIME, &ts );
return UNIX_START + duration_cast<win_time::duration>( seconds( ts.tv_sec ) + nanoseconds( ts.tv_nsec + 50 ) );
#endif
}

--- Synchronet 3.21a-Linux NewsLink 1.2