WSIZEOF | NOWSIZEOF
Category
Object code control
Pragma equivalent
#pragma wsizeof(on)
Purpose
Causes the sizeof
operator to return the widened size
for function return types.
When the WSIZEOF compiler option is in effect, sizeof
returns
the size of the widened type for function return types instead of
the size of the original return type.
When the NOWSIZEOF compiler option is in effect, sizeof
returns
the size of the original return type.
Syntax
Defaults
NOWSIZEOF
Usage
sizeof
operator was applied to a function return
type using the WSIZEOF compiler option, earlier C and C++ compilers
(prior to and including C/C++ for IBM® MVS™ Version 3 Release 1) returned
the size of the widened type instead of the original type. For example,
if the following code fragment, was compiled with an earlier compiler, i
would
have a value of 4
.
char foo();
i = sizeof foo();
Using the z/OS® XL C/C++
compiler, i
has a value of 1
, which is the size
of the original type char
.
The WSIZEOF compiler option toggles the behavior of the sizeof
operator
between that of the C and C++ compilers prior to and including C/C++ MVS Version 3 Release 1, and z/OS XL C/C++.
The usage status of this option is inserted in the object file to aid you in diagnosing a problem with your program.
Predefined macros
None.