The code:

#include <wchar.h>
#include <limits.h>
#if defined(WCHAR_MAX) && (WCHAR_MAX <= USHRT_MAX)
#endif

as TestFile.cpp when compiled gives:

#if defined(WCHAR_MAX) && (WCHAR_MAX <= USHRT_MAX)
                                   ^
TestFile.cpp(3) : Error: ')' expected
#endif
     ^
TestFile.cpp(4) : Preprocessor error: '#endif' found without '#if'
--- errorlevel 1

Edward Diener wrote:
> The code:
> 
> #include <wchar.h>
> #include <limits.h>
> #if defined(WCHAR_MAX) && (WCHAR_MAX <= USHRT_MAX)
> #endif
> 
> as TestFile.cpp when compiled gives:
> 
> #if defined(WCHAR_MAX) && (WCHAR_MAX <= USHRT_MAX)
>                                    ^
> TestFile.cpp(3) : Error: ')' expected


This is because WCHAR_MAX is defined as:

    (wchar_t)0xFFFF

and casts are not allowed in preprocessor expressions.

You can tell this by compiling this way:

H:ztc>dmc -c test -e -l
#if defined(WCHAR_MAX) && ((wchar_t)0xFFFF
                                          ^
test.cpp(3) : Error: ')' expected

Using -e -l will show the line after macro expansion.

On 8/28/2010 8:40 PM, Walter Bright wrote:
> Edward Diener wrote:
>> The code:
>>
>> #include <wchar.h>
>> #include <limits.h>
>> #if defined(WCHAR_MAX) && (WCHAR_MAX <= USHRT_MAX)
>> #endif
>>
>> as TestFile.cpp when compiled gives:
>>
>> #if defined(WCHAR_MAX) && (WCHAR_MAX <= USHRT_MAX)
>> ^
>> TestFile.cpp(3) : Error: ')' expected
>
>
> This is because WCHAR_MAX is defined as:
>
> (wchar_t)0xFFFF
>
> and casts are not allowed in preprocessor expressions.
>
> You can tell this by compiling this way:
>
> H:ztc>dmc -c test -e -l
> #if defined(WCHAR_MAX) && ((wchar_t)0xFFFF
> ^
> test.cpp(3) : Error: ')' expected
>
> Using -e -l will show the line after macro expansion.

I believe it is therefore clearly misdefined, as it is supposed to be a constant expression that one can use in preprocessor #if expressions. In the Ansi C standard we have in 7.18.3 "Limits of other integer types" in paragraph 2:

"Each instance of these macros shall be replaced by a constant expression suitable for use
in #if preprocessing directives, and this expression shall have the same type as would an
expression that is an object of the corresponding type converted according to the integer
promotions."

Edward Diener wrote:
> "Each instance of these macros shall be replaced by a constant expression suitable for use
> in #if preprocessing directives, and this expression shall have the same type as would an
> expression that is an object of the corresponding type converted according to the integer
> promotions."

You're right. I took off the (wchar_t) casts in \dm\include\wchar.h and \dm\include\stdint.h.

Em 29/8/2010 01:54, Walter Bright escreveu:
> Edward Diener wrote:
>> "Each instance of these macros shall be replaced by a constant
>> expression suitable for use
>> in #if preprocessing directives, and this expression shall have the
>> same type as would an
>> expression that is an object of the corresponding type converted
>> according to the integer
>> promotions."
>
> You're right. I took off the (wchar_t) casts in \dm\include\wchar.h and
> \dm\include\stdint.h.

Were those changes reflected in any patch/update? v852 seems to be the last update available.  However, checking the mentioned header files don't show any modifications.

Cesar Rabak wrote:
> Em 29/8/2010 01:54, Walter Bright escreveu:
>> Edward Diener wrote:
>>> "Each instance of these macros shall be replaced by a constant
>>> expression suitable for use
>>> in #if preprocessing directives, and this expression shall have the
>>> same type as would an
>>> expression that is an object of the corresponding type converted
>>> according to the integer
>>> promotions."
>>
>> You're right. I took off the (wchar_t) casts in \dm\include\wchar.h and
>> \dm\include\stdint.h.
> 
> Were those changes reflected in any patch/update? v852 seems to be the last update available.  However, checking the mentioned header files don't show any modifications.

No, but I'll email them to you.