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show throw example

ajneu
2017-12-06 23:48:24 +01:00
parent 50be3e67b4
commit f960d12e2e
1 changed files with 19 additions and 3 deletions
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Examples-and-Recipes.md

@@ -527,7 +527,7 @@ which currently outputs `2016f`.
<a name="time_point_to_components"></a> <a name="time_point_to_components"></a>
### Obtaining a `time_point` from `y/m/d h:m:s` components ### Obtaining a `time_point` from `y/m/d h:m:s` components
#### Date/time, interpreted as UTC #### Date/time interpreted as UTC, to `time_point`
Converting a date/time, interpreted as UTC Converting a date/time, interpreted as UTC
```cpp ```cpp
struct DateTime { // hold date/time (interpreted as UTC), to be converted to time_point struct DateTime { // hold date/time (interpreted as UTC), to be converted to time_point
@@ -574,7 +574,7 @@ std::cout << "Date/Time is " << tp << std::endl;
The above needs only the `"date/date.h"` header. (`"date/tz.h"` header and tz library are not needed). The above needs only the `"date/date.h"` header. (`"date/tz.h"` header and tz library are not needed).
#### Date/time, interpreted as coming from a specific time-zone #### Date/time (interpreted as coming from a specific time-zone), to `time_point`
If the date/time is taken as being from a specific time-zone, then "date/tz.h" header and tz library are needed: If the date/time is taken as being from a specific time-zone, then "date/tz.h" header and tz library are needed:
```cpp ```cpp
@@ -595,8 +595,10 @@ The above function can be called as follows
```cpp ```cpp
DateTime datetime{2016 /*year*/, 12 /*month*/, 24 /*day*/, 23 /* hour */, 0 /* min */, 0 /*sec*/}; // variable definition DateTime datetime{2016 /*year*/, 12 /*month*/, 24 /*day*/, 23 /* hour */, 0 /* min */, 0 /*sec*/}; // variable definition
using date::operator<<;
auto tp = datetime_to_timepoint(datetime, date::current_zone()); // datetime from local timezone auto tp = datetime_to_timepoint(datetime, date::current_zone()); // datetime from local timezone
using date::operator<<;
std::cout << tp << std::endl; std::cout << tp << std::endl;
std::cout << date::make_zoned("UTC", tp) << std::endl; std::cout << date::make_zoned("UTC", tp) << std::endl;
std::cout << date::make_zoned(date::current_zone(), tp) << std::endl; std::cout << date::make_zoned(date::current_zone(), tp) << std::endl;
@@ -609,7 +611,9 @@ std::cout << date::make_zoned(date::locate_zone("Europe/Moscow"), tp) << std::en
// 2016-12-25 01:00:00.000000000 MSK // 2016-12-25 01:00:00.000000000 MSK
auto tp2 = datetime_to_timepoint(datetime, date::locate_zone("America/New_York")); // datetime from New York auto tp2 = datetime_to_timepoint(datetime, date::locate_zone("America/New_York")); // datetime from New York
std::cout << tp2 << std::endl; std::cout << tp2 << std::endl;
std::cout << date::make_zoned("UTC", tp2) << std::endl; std::cout << date::make_zoned("UTC", tp2) << std::endl;
std::cout << date::make_zoned(date::current_zone(), tp2) << std::endl; std::cout << date::make_zoned(date::current_zone(), tp2) << std::endl;
@@ -620,6 +624,18 @@ std::cout << date::make_zoned(date::locate_zone("Europe/Moscow"), tp2) << std::e
// 2016-12-25 04:00:00.000000000 UTC // 2016-12-25 04:00:00.000000000 UTC
// 2016-12-25 05:00:00.000000000 CET // e.g. (if you're in CET timezone...) // 2016-12-25 05:00:00.000000000 CET // e.g. (if you're in CET timezone...)
// 2016-12-25 07:00:00.000000000 MSK // 2016-12-25 07:00:00.000000000 MSK
datetime = DateTime{2018 /*year*/, 3 /*month*/, 25 /*day*/, 2 /* hour */, 10 /* min */, 0 /*sec*/};
auto tp3 = datetime_to_timepoint(datetime, date::locate_zone("Europe/Berlin"));
// Will throw, with the following message
// terminate called after throwing an instance of 'date::nonexistent_local_time'
// what(): 2018-03-25 02:10:00 is in a gap between
// 2018-03-25 02:00:00 CET and
// 2018-03-25 03:00:00 CEST which are both equivalent to
// 2018-03-25 01:00:00 UTC
``` ```
#### `struct tm` holding the components #### `struct tm` holding the components