R devel - Apr 2008 - C++ complains abouct Rprintf signature

Dear R-devel,

My g++ complains about the first argument to Rprintf being non-const char *. For
example when compiling the line

Rprintf("hello world\n");

the following warning is emitted:
warning: deprecated conversion from string constant to 'char*'



Is there a reason for the non-const? It is curious that Rf_error, which is
similar to RPrintf, is const.



If there is a need to keep it non-const in C please consider using the patch
below in future releases.



Thanks,

Vadim

Patch to R-2.6.1/include/R_ext/Print.h

#ifdef  __cplusplus
extern "C" {
#define CONST const
#endif
void Rprintf(CONST char *, ...);
void REprintf(CONST char *, ...);
void Rvprintf(const char *, va_list);
void REvprintf(const char *, va_list);
#ifdef  __cplusplus
}
#undef CONST
#endif

	[[alternative HTML version deleted]]

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It has ....

On Wed, 16 Apr 2008, Vadim Organovich wrote:
> Dear R-devel,
>
> My g++ complains about the first argument to Rprintf being non-const char
*. For example when compiling the line
>
> Rprintf("hello world\n");
>
> the following warning is emitted:
> warning: deprecated conversion from string constant to 'char*'
>
>
>
> Is there a reason for the non-const? It is curious that Rf_error, which is
similar to RPrintf, is const.
>
>
>
> If there is a need to keep it non-const in C please consider using the
patch below in future releases.
>
>
>
> Thanks,
>
> Vadim
>
> Patch to R-2.6.1/include/R_ext/Print.h
>
> #ifdef  __cplusplus
> extern "C" {
> #define CONST const
> #endif
> void Rprintf(CONST char *, ...);
> void REprintf(CONST char *, ...);
> void Rvprintf(const char *, va_list);
> void REvprintf(const char *, va_list);
> #ifdef  __cplusplus
> }
> #undef CONST
> #endif
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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