[Rcpp-devel] long long

[Dirk Eddelbuettel]

On 19 September 2013 at 15:48, Romain Francois wrote:
| What I want is to change this:
| 
| #if defined(__GNUC__)
| #if defined(__GXX_EXPERIMENTAL_CXX0X__) || (defined (__clang__) && 
| defined(__LP64__))
| #ifdef __LONG_LONG_MAX__
|      __extension__ typedef long long int rcpp_long_long_type;
|      __extension__ typedef unsigned long long int rcpp_ulong_long_type;
|      #define RCPP_HAS_LONG_LONG_TYPES
| #endif
| #endif
| #endif
| 
| 
| to this:
| 
| #if defined(__GNUC__) &&  defined(__LONG_LONG_MAX__)
|      __extension__ typedef long long int rcpp_long_long_type;
|      __extension__ typedef unsigned long long int rcpp_ulong_long_type;
|      #define RCPP_HAS_LONG_LONG_TYPES
| #endif

That's novel and could work.  May need testing.  May also need to be checked
against just using -std=c++11 / -std=c++0x which give us long long rightaway.

Also note that Murray got a similar trick into RProtoBuf, albeit at the cost
of configure test (by finding an M4 macros which determines whether the
compiler can in fact do c++11, and if so, turns it on).

| And as long as we don't actually have "long long" in code, but use 
| "rcpp_long_long_type" then we are fine :

What happens when you have 'long long' via C++11? Do they coexist?

Also not sure why you first post which seemingly asks for comments and then
still rush to commit before anyone has comments.  Oh well.

Dirk
 
-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com