[Rcpp-devel] Datetime substraction bug ?

[Dirk Eddelbuettel]

On 29 March 2013 at 23:37, Robin Girard wrote:
| Hi List
| 
| why is it that we have in the Datetime definition
| (here http://dirk.eddelbuettel.com/code/rcpp/html/Date_8cpp_source.html#l00271 )
| 
| double operator-(const Datetime& d1, const Datetime& d2) { return d2.m_dt - d1.m_dt; }
| bool operator<(const Datetime &d1, const Datetime& d2) { return d1.m_dt < d2.m_dt; }
| 
| I feel there is a contradiction 
| substraction shoulb be d1.m_dt - d2.m_dt;  no ? 

It's been a while since I wrote that and I think I followed the difftime()
convention in R. Or maybe not.  To me d1 comes before d2 in the way the
arguments are given, so d2 is larger and I want to subtract d1 from d2.

In any event, if it bugs you greatly you are always free to write your own
function. ;-)

Dirk

| 
| Robin
| 
| Dr. Girard Robin
| Chargé de Recherche
| 
| MINES-ParisTech / Département Energétique et Procédés / PERSEE / Groupe ERSEI
| Centre Procédés, Energies Renouvelables et Systèmes Energétiques (PERSEE)
| Center for Processes, Renewables Energies and Energy Systems
| Renewable Energies & Smartgrids (ERSEI)
| 
| 1 Rue Claude Daunesse - CS 10207 - F-06904 Sophia Antipolis Cedex
| Tel: +33.4.93.67.89.64 (~99), Fax: +33.4.93.95.75.35
| e-mail : robin.girard at mines-paristech.fr
| 
| web page perso http://www.mines-paristech.fr/Services/Annuaire/&?id=8828
| statoverflow : http://stats.stackexchange.com/users/223/robin-girard
| web page centre PERSEE : http://www.cep.mines-paristech.fr/
| linkedin : http://www.linkedin.com/profile/view?id=14907272&trk=tab_pro
| 
| Le lien vaut mieux que le bien.
| ________________________________________________________
| 
| CONFIDENTIALITY : This  e-mail  and  any attachments are
| confidential and may be privileged. If  you are not a
| named recipient, please notify the sender immediately and
| do not disclose the contents to another person, use it for
| any purpose or store or copy the information in any medium.
| 
| CONFIDENTIALITE : Ce message et les éventuelles pièces
| attachées sontconfidentiels et peuvent être une
| communication protégée. Si vous n'êtes pas dans la liste
| des destinataires, veuillez informer l'expéditeur
| immédiatement et ne pas ouvrir ni divulguer le contenu
| à une tierce personne, ne pas l'utiliser pour quelque
| raison que ce soit, ne pas stocker ou copier l'information
| qu'il contient sur un quelconque support.
| 
| _______________________________________________
| Rcpp-devel mailing list
| Rcpp-devel at lists.r-forge.r-project.org
| https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com