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2016 Update

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This commit is contained in:
Tina Müller 2016-12-05 22:15:40 +01:00
parent 948b86eafa
commit dcf5d15da3
7965 changed files with 139854 additions and 31002 deletions
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21
Task/Call-a-function/C/call-a-function.c
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@ -30,8 +30,25 @@ void h(int a, ...)
/* call it as: (if you feed it something it doesn't expect, don't count on it working) */
h(1, 2, 3, 4, "abcd", (void*)0);
/* named arguments: no such thing */
/* statement context: is that a real phrase? */
/* named arguments: this is only possible through some pre-processor abuse
*/
struct v_args {
int arg1;
int arg2;
char _sentinel;
};
void _v(struct v_args args)
{
printf("%d, %d\n", args.arg1, args.arg2);
}
#define v(...) _v((struct v_args){__VA_ARGS__})
v(.arg2 = 5, .arg1 = 17); // prints "17,5"
/* NOTE the above implementation gives us optional typesafe optional arguments as well (unspecified arguments are initialized to zero)*/
v(.arg2=1); // prints "0,1"
v(); // prints "0,0"
/* as a first-class object (i.e. function pointer) */
printf("%p", f); /* that's the f() above */