Tomasz Kamiński 58a4a9518a Mismatch in return type of converting function is now hard error. ...

Change the implementation, in the way that mismatch in return
type of the from/to_sys/utc functions (not returning time_point,
or returning time_point with inappropriate clock) leads to
hard error.

Added appropariate fail test for to_sys function, including:
* returning an int
* returning time_point of wrong clock
* reutrning reference to time_point

2017-11-24 22:23:50 +01:00

..

date

Mismatch in return type of converting function is now hard error.

2017-11-24 22:23:50 +01:00