In Programmer's Guide / Preprocessor / Macros, paragraph "Macros debug", the method (using the "-pp" compiler option) to debug codes that use macros is described.

If you look at the file.bas after preprocessing, you can see that everything is predisposed at compile time. file.pp.bas: dim as long k do locate 5 print "Press 1 = double" print "Press 2 = single" print "Press 3 = integer" print "Press 4 = string" print print...

Or now, for fbc version >= 1.07: #macro GetSize(array,d) #include once "fbc-int/array.bi" #if __FB_VERSION__ >= "1.08" d = FBC.ArrayDescriptorPtr(array())->size #elseif __FB_VERSION__ >= "1.07" d = fb_ArrayGetDesc(array())->size #endif #endmacro

OK for point 1 KeyPgUbound → fxm [corrected the erroneous comment in the fourth example] For point 2 If the array is not empty and if the index value 0 is not within the valid limits of the array, we get: - a compilation error for a static array, - or a runtime error for a dynamic array, when testi...

Well done.

I still have trouble remembering the order in which macro calls must be nested for expressions to be correctly evaluated.

http://users.freebasic-portal.de/stw/builds/ is came back :-)
Thanks.

The Type structure contains only an array of string descriptors, and qsort only works on these to sort the list (string character data is dynamically allocated elsewhere in memory). Only your callback function access in read to the string character data when comparing the elements pointed by qsort. ...

Thank you dodicat for your example. Your code slightly modified to manage a non-static member callback function (but virtual): extern "c" declare sub qsort_s alias "qsort_s"(as any ptr,as long,as long,as function cdecl(as any ptr,as any ptr,as any ptr) as long,as any ptr) end ext...

I did not propose an example with qsort_s because I do not know how to get it back with FreeBASIC (Windows).

[edit]
But see dodicat's example below.

Therefore, the principle using either 'qsort' or 'qsort_s' would be similar to the following example with either callback/[member_]launch or callback_context/[member_]launch_context: Sub launch (Byval psub As Sub(Byref str1 As String, Byref str2 As String)) psub("parameter #1.1", "par...

Look at page Compiler Option: -l -l < libname > is the command to add the library libname to the linker's list: - where '-l' is only a prefix to add a library file, - and 'libname' is the user name of the library. The internal name of the static library becomes 'lib < libname> .a...

For example:

Yes. A very twisted hacking could be to use a non-static member function as callback, but a function declared with a single explicit parameter: - thus, the implicit (first) parameter 'this' would correspond to the first pointer value provided by qsort, - and the only explicit (second) parameter woul...

I vaguely remember this now from some other code. But I will probably forget again within a few months. All this is well described on the documentation page 'STATIC (Member)' . And qSortCallback() needs to be static because the compiler needs to know where the function code in memor...

Thank you.