static const screenWidth = 640;
int *x =0 ;
x = const_cast<int *> (&screenWidth);
x = 100;
[/souce]
gives me an error when trying to specify x with a value.
If it is just a const it works fine. But if its a static const
it buckles !!. It compiles and links fine but dies when using it.
any idea''s ? const_cast +static consts ?
Author
im having problems taking the const off static variables.
This may be a typo, but shouldn''t that read...
*x = 100;
Otherwise you are just setting the address of pointer x to 100. I''m assuming you probably have something that tries to access the contents of what x points to (*x) later on, and that is probably where your error is popping up. That it would work at all as it is, is suprising.
D
*x = 100;
Otherwise you are just setting the address of pointer x to 100. I''m assuming you probably have something that tries to access the contents of what x points to (*x) later on, and that is probably where your error is popping up. That it would work at all as it is, is suprising.
D
Author
Indeed your right ..sorry this is it
now its definatly to do with it being static, but I really need
it to remain static ...and const.
Can anyone see a way out or even explain why it dies because
its static ?
int *x =0 ;x = const_cast<int *> (&screenWidth);*x = width; now its definatly to do with it being static, but I really need
it to remain static ...and const.
Can anyone see a way out or even explain why it dies because
its static ?
because static const is interpretted as the same thing as #define by many compilers. The value you''re trying to modify is probably in program memory, and protected by the OS as read-only. Casting away const is the paramount of all programming sins, so your program has justly punished you for it.
declaring variables and functions static to hide them in the module they are in - in terms of linkage
is a deprecated feature in the C++ standard
the new way to accomplish the same thing is an anonymous namespace
in a .cpp file:
namespace
{
const int screenWidth = 640;
}
Will acomplish the same as the older ''static const''
and will likely alleviate your problem
is a deprecated feature in the C++ standard
the new way to accomplish the same thing is an anonymous namespace
in a .cpp file:
namespace
{
const int screenWidth = 640;
}
Will acomplish the same as the older ''static const''
and will likely alleviate your problem
This topic is closed to new replies.
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