C macro expansion of a function pointer based on for loop incrementor

C macro expansion of a function pointer based on for loop incrementor

By : miti
Date : November 29 2020, 09:01 AM
around this issue What you are trying to do is not possible with a macro because macros are expanded at compile time, well before the runtime and loops start running.
However, you can easily do this with a for loop on an array of function pointers:
code :
typedef int(*funcbase_t)(int);
funcbase_t fbases[] = {
    funcbase0, funcbase1, funcbase2, funcbase3, ...
for(int i = 0; i < 32; i++)

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CPP: avoiding macro expansion of a macro function parameter

CPP: avoiding macro expansion of a macro function parameter

By : user1616593
Date : March 29 2020, 07:55 AM
wish helps you what I'd like to do (for logging purposes) is something like this: , I'm doing:
code :
#include <cstdio>

#define FOO 1
#define BAR 2

#define LOG_SIMPLE(ptr, lib, str) printf("%s\n", #lib);
#define LOG(ptr, lib, str) LOG_SIMPLE(ptr, ##lib, str)

int main()
  LOG_SIMPLE(0, FOO, "some error");
  LOG(0, BAR, "some other error");
#include <stdio.h>

#define FOO 1
#define BAR 2

#define LOG_SIMPLE(ptr, str, lib) printf("%s\n", #lib);
#define LOG(ptr, str, lib, ...) LOG_SIMPLE(ptr, str, lib##__VA_ARGS__)

int main()
  LOG_SIMPLE(0, "some error", FOO);
  LOG(0, "some other error", BAR);
  LOG(0, "some other error", FOO, BAR);
gnuplot macro expansion in bash here document when in for loop

gnuplot macro expansion in bash here document when in for loop

By : P.Copai
Date : March 29 2020, 07:55 AM
seems to work fine This was caused by a bug. From the answer to the bug report http://sourceforge.net/p/gnuplot/bugs/1264/
C++ macro function expansion based on the macro function arguments

C++ macro function expansion based on the macro function arguments

By : ompgupta
Date : March 29 2020, 07:55 AM
this will help I don't think you can do it solely with preprocessing directives, since the preprocessor doesn't really give you the necessary mechanisms to guide macro expansion based on the arguments to the macro.
That said, you can perpetrate some mildly ugly hacks that will work. Consider the following code:
code :
#include <iostream>

#define MYLOG_ERR  1
#define MYLOG_INFO 0

#define P(a,b) a##b

#define MYLOG(x,y) do { if (P(MYLOG_,x)) { std::cerr << y << std::endl; } } while (0)

int main(void)
    MYLOG(ERR, "err");
    MYLOG(INFO, "info");
Understanding loop macro expansion

Understanding loop macro expansion

By : Biomed92
Date : March 29 2020, 07:55 AM
it should still fix some issue list-head and list-tail are initially the same (in the eq sense). list-head is a cons which cdr is the list being collected. list-tail points to the last cons in the list (except initially, see below).
To add an element to the end of the list, replacd modifies the cdr of list-tail to add a new cons, and list-tail is updated to point to the new cons.
Incorrect expansion of a function-like macro

Incorrect expansion of a function-like macro

By : Allan James
Date : September 22 2020, 05:00 AM
this will help Function-like macro definitions can't have whitespace after the macro name
code :
#define ENTRY (a,b) (a[b-1])              // wrong
#define ENTRY(a,b) ((a)[(b)-1])               // correct
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