New class tools::Duration

[Eike Rathke]

Hi,

On Monday, 2023-06-19 18:41:48 +0200, Eike Rathke wrote:
> On Monday, 2023-06-19 14:25:16 +0200, Eike Rathke wrote:
> >     friend tools::Duration operator -( const DateTime& rDateTime1, const DateTime& rDateTime2 );
> > (you can also use that temporarily to find code places to change).
> 
> Having tried that, it tends to get cumbersome [...]

So what I came up with is

    static  double  Sub( const DateTime& rDateTime1, const DateTime& rDateTime2 );

and changed all relevant places to use DateTime::Sub() instead of
operator-(), which were less than I initially thought there would be.

Next step will change operator-() to

    friend tools::Duration operator -( const DateTime& rDateTime1, const DateTime& rDateTime2 );

so if one needs a duration to be remembered use that, and otherwise if
the floating point "time in days" value is to be processed use
DateTime::Sub().

  Eike

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