• Laeeth Isharc (7/7) Dec 31 2014 Am I missing a more agreeable way to check the return value of a
• Rikki Cattermole (5/12) Dec 31 2014 == for value
• Mike Parker (7/20) Dec 31 2014 You can take your pick of these:
• Laeeth Isharc (2/2) Dec 31 2014 Thanks for the help.

"Laeeth Isharc" <laeethnospam spammenot_laeeth.com> writes:

Am I missing a more agreeable way to check the return value of a 
C function against NULL.  It's fine if it's a char*, but if it 
returns a pointer to some kind of struct, one has to go through 
and convert each instance of NULL to a cast of the appropriate 
return type.  Eg cast(funnystruct*)0

   if ((tomime_fields.fld_description==cast(char*)0))
     throw new Exception("show_part_info: description is NULL");

Rikki Cattermole <alphaglosined gmail.com> writes:

On 1/01/2015 12:22 a.m., Laeeth Isharc wrote:
 Am I missing a more agreeable way to check the return value of a C
 function against NULL.  It's fine if it's a char*, but if it returns a
 pointer to some kind of struct, one has to go through and convert each
 instance of NULL to a cast of the appropriate return type.  Eg
 cast(funnystruct*)0

    if ((tomime_fields.fld_description==cast(char*)0))
      throw new Exception("show_part_info: description is NULL");

== for value
is for pointers

if (tomime_fields.fld_description is null)
	throw new Exception("...");

Mike Parker <aldacron gmail.com> writes:

On 12/31/2014 8:29 PM, Rikki Cattermole wrote:
 On 1/01/2015 12:22 a.m., Laeeth Isharc wrote:
 Am I missing a more agreeable way to check the return value of a C
 function against NULL.  It's fine if it's a char*, but if it returns a
 pointer to some kind of struct, one has to go through and convert each
 instance of NULL to a cast of the appropriate return type.  Eg
 cast(funnystruct*)0


You can take your pick of these:

if( !ptr ) ...
if( ptr == null ) ...
if( ptr is null ) ...


    if ((tomime_fields.fld_description==cast(char*)0))
      throw new Exception("show_part_info: description is NULL");

 == for value
 is for pointers

 if (tomime_fields.fld_description is null)
      throw new Exception("...");

Actually, while 'is' does work for pointers, it's only necessary for 
references.

"Laeeth Isharc" <Laeeth.nospam nospam-laeeth.com> writes:

Thanks for the help.

Laeeth