1 | // Copyright 2015 Vicente J. Botet Escriba |
2 | // Distributed under the Boost Software License, Version 1.0. |
3 | // See http://www.boost.org/LICENSE_1_0.txt |
4 | // See http://www.boost.org/libs/chrono for documentation. |
5 | |
6 | #define BOOST_CHRONO_VERION 2 |
7 | #include <iostream> |
8 | #include <boost/chrono/chrono.hpp> |
9 | #include <boost/chrono/chrono_io.hpp> |
10 | |
11 | // a custom clock |
12 | // here based on boost's own system_clock |
13 | class MyMillenniumClock |
14 | { |
15 | public: |
16 | typedef boost::chrono::system_clock::rep rep; |
17 | typedef boost::chrono::system_clock::period period; |
18 | typedef boost::chrono::duration<rep, period> duration; |
19 | typedef boost::chrono::time_point<MyMillenniumClock> time_point; |
20 | |
21 | BOOST_STATIC_CONSTEXPR bool is_steady = boost::chrono::system_clock::is_steady; |
22 | |
23 | public: |
24 | /// Returns a time_point representing the current value of the clock. |
25 | static time_point now() { |
26 | return time_point(boost::chrono::system_clock::now().time_since_epoch() - boost::chrono::hours(30*365)); |
27 | } |
28 | }; |
29 | |
30 | |
31 | namespace boost |
32 | { |
33 | namespace chrono |
34 | { |
35 | template <class CharT> |
36 | struct clock_string<MyMillenniumClock, CharT> |
37 | { |
38 | static std::basic_string<CharT> name() { |
39 | static const CharT a[] = {'M', 'y', 'M', 'i', 'l', 'l', 'e', 'n', 'n', 'i', 'u', 'm', 'C', 'l', 'o', 'c', 'k'}; |
40 | return std::basic_string<CharT>(a, a + sizeof(a)/sizeof(a[0])); |
41 | } |
42 | static std::basic_string<CharT> since() { |
43 | static const CharT a[] = {' ', 's', 'i', 'n', 'c', 'e', ' ', 'y', 'e', 'a', 'r', ' ', '2', 'k'}; |
44 | return std::basic_string<CharT>(a, a + sizeof(a)/sizeof(a[0])); |
45 | } |
46 | }; |
47 | } |
48 | } |
49 | |
50 | template <typename CharT, typename TPUFacet> |
51 | std::basic_string<CharT> get_epoch_custom(MyMillenniumClock, TPUFacet&) |
52 | { |
53 | return boost::chrono::clock_string<MyMillenniumClock,CharT>::since(); |
54 | } |
55 | |
56 | int main() |
57 | { |
58 | std::cout << boost::chrono::steady_clock::now() << std::endl; |
59 | std::cout << MyMillenniumClock::now() << std::endl; |
60 | return 0; |
61 | } |
62 | |