assert_default_params.c

The file `assert_default_params.c` defines a custom `assert` macro that supports optional error messages by wrapping an `assert_func` function, which prints a failure message to stderr and calls `abort()` if a condition is false. The `main` function demonstrates this by asserting that `argc` is greater than zero and that `argv[0]` is not null, with the second assertion including a custom error string. This code illustrates a technique for adding descriptive assertions in C using variadic macros.

assert default params.c This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters Show hidden characters void assert func int cond , const char msg { if cond { fprintf stderr , "assert failed: %s\n" , msg ; abort ; } } define assert helper x , y , ... assert func x, y define assert x , ... assert helper x , VA ARGS , x int main int argc , char argv { assert argc 0 ; assert argv 0 = 0 , "argv 0 cannot be null" ; }