TypeOf or similar function

[somic]

Hi,
ask for help.

Does someone know how it is possible to determine the type of variable at runtime:

es. something like

Code: Select all

*addr = @dbl
if typeof(*addr) = #pb_double
...
elseif typeof(*addr) = #pb_fixedstring
...
typeof(*addr) = #pb_array
...

Thank you for any advice
Rgds,
Somic

[SFSxOI]

This maybe some info? http://www.purebasic.fr/english/viewtop ... lit=TypeOf a compiler directive? Don't know if it ever got added as Fred seems to indicate in that thread.

[eesau]

It wouldn't be possible to use TypeOf() on a pointer, as it is just a pointer, and could point to anything. TypeOf for variables would be possible though.

[somic]

@SFSxOI
I knew about that thread but also not able to find the implementation.

@eesau
I understand your point, but SizeOf(*addr) gives correct size of anything pointed by *addr.

I guess that, somewhere in the memory there should be stored the info.

[Demivec]

@eesau
I understand your point, but SizeOf(*addr) gives correct size of anything pointed by *addr.

I guess that, somewhere in the memory there should be stored the info.

If you use SizeOf(*addr) it will always be equal to the size of an Integer. Pointers are Integer variables that reference an address. Here is example code to illustrate:

Code: Select all

Define *addr.Quad,*addr2.Byte

Debug SizeOf(*addr) ;displays 4 on x86 32-bit
Debug SizeOf(*addr2) ;displays 4 on x86 32-bit

I don't think the size is stored anywhere in memory. SizeOf() is a compiler function which means that it doesn't use runtime values. That means the values wouldn't be stored in memory during runtime.