[GiNaC-devel] Patches for compilation with MSVC

[Sergei Steshenko]

Just curious - isn't the piece in question C++ code ?
If yes, isn't the RHS of type double or complex, i.e. of a floating point opposed to integer type.
If yes, won't log(7) be automatically promoted to log(7.0) by the C++ compiler ?
I.e. does "GiNaC does not apply numerical evaluation automatically" apply ?
--Sergei.

 
      From: Alexei Sheplyakov <alexei.sheplyakov at gmail.com>
 To: GiNaC development list <ginac-devel at ginac.de> 
 Sent: Wednesday, June 3, 2015 6:01 PM
 Subject: Re: [GiNaC-devel] Patches for compilation with MSVC
   
Hi, Jan,

I'm afraid your patch is not quite correct.

-      ex e2 = log(7)+log(p)+log(pow(q,3))+log(-z*a*w*pow(b,2));
+      ex e2 = log(7.0)+log(p)+log(pow(q,3))+log(-z*a*w*pow(b,2));

log(7) is an exact quantity, and log(7.0) is not (it's a floating
point number). In general
GiNaC does not apply numerical evaluation automatically. Could you
please try replacing
log(7) with log(ex(7))?

Best regards,
      Alexei


On Mon, May 25, 2015 at 3:32 PM, Jan Rheinländer <jrheinlaender at gmx.de> wrote:
> Hi,
>
> here are some simple patches to allow the current version (from git) of
> GiNaC to be compiled with MS Visual C++:
>
> 1. Fix problem with min() and max() macros in MSVC:
>
> --- a/ginac/compiler.h
> +++ b/ginac/compiler.h
> @@ -34,6 +34,8 @@
>  #ifdef _MSC_VER
>  #define __func__ __FUNCTION__
>  #define __alignof__ __alignof
> +#define NOMINMAX
> +#include <algorithm>
>  #endif
>
>  #endif // ndef GINAC_COMPILER_DEP_H
>
> --- a/check/exam_cra.cpp
> +++ b/check/exam_cra.cpp
> @@ -21,6 +21,7 @@
>  */
>
>  #include "polynomial/cra_garner.h"
> +#include "../ginac/compiler.h"
>
>  #include <cln/integer.h>
>  #include <cln/integer_io.h>
>
> 2. Fix ambiguous overload of log() (MSVC is more exact here than gcc):
>
> --- a/check/exam_inifcns.cpp
> +++ b/check/exam_inifcns.cpp
> @@ -312,7 +312,7 @@ static unsigned inifcns_consist_log()
>
>        // a bit more complicated
>        ex e1 =
> log(-7*p*pow(q,3)*a*pow(b,2)*z*w).expand(expand_options::expand_transcendental);
> -      ex e2 = log(7)+log(p)+log(pow(q,3))+log(-z*a*w*pow(b,2));
> +      ex e2 = log(7.0)+log(p)+log(pow(q,3))+log(-z*a*w*pow(b,2));
>        if (!e1.is_equal(e2))
>                ++result;
>
>
>
> _______________________________________________
> GiNaC-devel mailing list
> GiNaC-devel at ginac.de
> https://www.cebix.net/mailman/listinfo/ginac-devel


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