Hi sokken, welcome to forum!

I think the first thing is to well study the documentation DO...LOOP and test the different proposed examples.

Keyword #DEFINE in documentation:
.....
Note: In the function-like macro declaration, the identifier should be followed by the opening parentheses (() immediately without any white-space in between, otherwise the compiler will treat it as part of the body.
.....

Another example: If you want know the current size of the memory allocated to the character data of a var-len string, you must access the third integer value of the string descriptor: Dim As String s = "Hello FreeBASIC!" '' This next line is more clear than the last three Print Cast(Intege...

To avoid a compiler warning on a pointer hacking, one workaround without to code a pointer casting can be to use a temporary intermediary "Any Type" pointer which is obviously compatible any pointer! Example: '' First code block with a compiler warning Dim As Wstring Ptr pw1 Dim As Ubyte P...

There are exceptions, maybe if you're casting to HWND, or doing something particularly hackish, but sometimes people assume the warning is just an annoyance, cast it away, and leave a bug lurking. To be funny, I would say that the example of the documentation for the keyword CPTR should be an examp...

I think well-written code should have no warnings. But casting away a warning isn't always the best approach, and may end up masking a bug. Consider as example the program of matwachich above, and the two functions "WStr_t.get_ptr()" and "WStr_t.get_ptr(as uinteger)", which retu...

Does this mean that you prefer to leave the compiler warnings ("Suspicious pointer assignment"), either eyes closed in trusting in its conversion, or in checking its conversion? In addition, these compiler warnings are annoying for debugging program syntax! I prefer to explicitly specify m...

NULL is a macro in C defined in the header <stddef.h>, and C++ inherits it (and of course places it in the header <cstddef>, as per the usual mapping between C header names and C++ header names). Note that at one time C seems to have placed NULL in <stdio.h> The definition of NULL for C and C++ dif...

I thought that the code:
int x = NULL;
is legal C++.
Because of this and the ensuing confusion, C++11 now has a keyword 'nullptr' representing a null pointer:
int* ptr = nullptr;

D.J.Peters wrote:

Code: Select all

#ifndef NULL
  #define NULL cptr(any ptr, 0)
#endif

Yes, but if you want to use 'NULL' with other variables than any pointer, a compiler warning occurs: 'Implicit conversion'.
My definition is less "pure C" but more convenient (no warning with any type of variable)!

dkl, Referring to my post just above (http://www.freebasic.net/forum/viewtopic.php?p=188876#p188876): - In a future release, can we expect to a right solution for that problem of cascading virtual operators as "Let" and "Cast", because they cannot be called with a syntax like &qu...

Very small remark about your casting on function results: - When the variable of the return instruction is compatible to the return declaration of the function, there is no need to cast this variable before return, because anyway the compiler already does it without even warning message. - The same...

How to keep private the three member data: At first, by defining two member operators "+=" (that can access private data), you can then extremely simplify the two non-member operators "+" by reducing their body to two high level instructions. #include "crt.bi" #define ...

Ok in order to optimize the execution speed.
The three member data ("__data", "__str_len" and "__allocated") are like those of a descriptor for var-len string.