[boost] [chrono/date] Unit specifiers arithmetic

Subject: [boost] [chrono/date] Unit specifiers arithmetic
From: Vicente J. Botet Escriba (vicente.botet_at_[hidden])
Date: 2013-05-06 06:31:11

Hi,

Moving from checked dates to unchecked ones by default and forcing to 
user the Unit specifiers year/month/day in any date constructor (even 
the unchecked ones) has some ugly consequences. Note that I was able to 
build an unchecked date as

  date d(2013,5,6, no_check);

Given

   year y;
month m;
   day d;

the following will not compile now as the constructors expects a year 
but y+1 is an int.

   date d(y+1, m, d);

The user needs to type

   date d(year(y+1), m, d);

Is this what we want to provide to the user or should we add basic 
arithmetic on these unit specifiers?

Best,
Vicente