On Wednesday, 30 May 2018 at 20:43:48 UTC, Ali Çehreli wrote:
On 05/30/2018 01:09 PM, Dr.No wrote:
> consider a C function with this prototype:
>> void foo(const char *baa);
>
> Does it means I should do:
>
>> string s = ...;
>> auto cstring = s.toStringz;
>> foo(cstring);
>
> rather just:
>
>> foo(s.toStringz);
>
> ?
It depends. cstring method above is not sufficient if cstring's
life is shorter than the C library's use:
void bar() {
string s = ...;
auto cstring = s.toStringz;
foo(cstring);
} // <- cstring is gone
What if the library saved that pointer while performing foo()?
If cstring is in module-scope or in a container (e.g. an array)
that's in module-scope then it's fine. But then, you would have
to remove it from that container when the C library does not
need that pointer anymore.
Ali
is foo() is being called from a thread, how I am supposed to keep
cstring "alive"?
