Re:Why Fennel?
by ahoka on Wednesday September 13, 2023 @02:40PM
(#37500072)
Fun fact: in C, if you have a signature like “int foo()”, it means any number of arguments can be passed (vs “int foo(void)” which means no args).
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Re:Why Fennel?
by sovietswag on Wednesday September 13, 2023 @02:44PM
(#37500133)
Good reference for that: https://jameshfisher.com/2016/11/27/c-k-and-r/
This was also used to implement variadic functions like printf before varargs, see https://retrocomputing.stackexchange.com/a/20517
And there is no way for the callee to check the nr of passed args, unlike in Lua.
that's ... (amazing|C for ya)
int foo() {
return 0;
}
int main(int argc, char* argv[]) {
return foo("alpha", "beta", 1);
}
$ gcc-13 -Wall -Werror -o foo foo.c
# oh, sads
$ clang -o foo ./foo.c
./foo.c:5:34: warning: too many arguments in call to 'foo'
return foo("alpha", "beta", 1);
~~~ ^
./foo.c:5:15: warning: passing arguments to 'foo' without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
return foo("alpha", "beta", 1);
^
2 warnings generated.