[ros-dev] Re: Compiler-independence for 64-bit integral constants

[Mark Weaver]

> #ifdef __GNUC__
> #define	FMT_INT64 _T("L")
> #elif defined(_MSC_VER)
> #define	FMT_INT64 _T("I64")
> #else
> #error Unknown compiler for 64-bit integral constant suffix
> #endif
> 
> 
> "FMT" stands for "format string", I think this is a bit clearer than "DEFINE" or "MAKE".
> 
> 
> This are some usage examples:
> 
> printf("%" FMT_INT64 "d", index);  /* format 64 bit decimal integer */
> 
> sprintf(buffer, "%" FMT_INT64 "x", index);  /* format 64 bit hex number, lower case */
> 
> sprintf(buffer, "%" FMT_INT64 "X", index);  /* format 64 bit hex number, upper case */
> 
These don't work when compiling for a unicode build.  It's relatively 
common to deal with mixed strings (e.g. smtp/pop/imap/http server/client 
programs should typically deal with files using unicode for paths, but 
the protocol specifies ASCII strings).  I would plump for 
FMT_INT64A/FMT_INT64W/FMT_INT64 to take care of this.