    const std = @import("std");

    pub const WindowsVersion = std.Target.Os.WindowsVersion;

    /// Returns the highest known WindowsVersion deduced from reported runtime information.
    /// Discards information about in-between versions we don't differentiate.
    pub fn detectRuntimeVersion() WindowsVersion {
        var version_info: std.os.windows.RTL_OSVERSIONINFOW = undefined;
        version_info.dwOSVersionInfoSize = @sizeOf(@TypeOf(version_info));

        switch (std.os.windows.ntdll.RtlGetVersion(&version_info)) {
            .SUCCESS => {},
            else => unreachable,
        }

        // Starting from the system infos build a NTDDI-like version

        // constant whose format is:

        //   B0 B1 B2 B3

        //   `---` `` ``--> Sub-version (Starting from Windows 10 onwards)

        //     \    `--> Service pack (Always zero in the constants defined)

        //      `--> OS version (Major & minor)

        const os_ver: u16 = @intCast(u16, version_info.dwMajorVersion & 0xff) << 8 |
            @intCast(u16, version_info.dwMinorVersion & 0xff);
        const sp_ver: u8 = 0;
        const sub_ver: u8 = if (os_ver >= 0x0A00) subver: {
            // There's no other way to obtain this info beside

            // checking the build number against a known set of

            // values

            var last_idx: usize = 0;
            for (WindowsVersion.known_win10_build_numbers) |build, i| {
                if (version_info.dwBuildNumber >= build)
                    last_idx = i;
            }
            break :subver @truncate(u8, last_idx);
        } else 0;

        const version: u32 = @as(u32, os_ver) << 16 | @as(u16, sp_ver) << 8 | sub_ver;

        return @intToEnum(WindowsVersion, version);
    }