D as a Better C

[Moritz Maxeiner via Digitalmars-d-announce]

On Wednesday, 23 August 2017 at 14:37:19 UTC, Steven 
Schveighoffer wrote:
> On 8/23/17 9:12 AM, Mike Parker wrote:
>> To coincide with the improvements to -betterC in the upcoming 
>> DMD 2.076, Walter has published a new article on the D blog 
>> about what it is and why to use it. A fun read. And I'm 
>> personally happy to see the love this feature is getting. I 
>> have a project I'd like to use it with if I can ever make the 
>> time for it!
>> 
>> The blog:
>> 
>> https://dlang.org/blog/2017/08/23/d-as-a-better-c/
>> 
>> Reddit:
>> https://www.reddit.com/r/programming/comments/6viswu/d_as_a_better_c/
>
> How do dynamic closures work without the GC?
>
> Nice article, BTW.
>
> -Steve

They don't (right now, using dmd ~master), because they depend on 
druntime:

--- a.c ---
#include <stdio.h>
#include <stdint.h>

uint32_t foo();

int main(int argc, char** argv)
{
     uint32_t x = foo();
     printf("%d\n", x);
}
-----------

--- b.d ---
auto test()
{
     uint i = 42;
     return () {
         return i;
     };
}

oo()
{
     auto x = test();
     return x();
}
-----------

$ dmd -c -betterC b.d
$ gcc a.c b.d
Undefined symbols for architecture x86_64:
   "__d_allocmemory", referenced from:
       _D1b4testFNaNbNfZDFNaNbNiNfZk in b.o
ld: symbol(s) not found for architecture x86_64extern(C) uint 
foo()
{
     auto x = test();
     return x();
}
-----------

$ dmd -c -betterC b.d
$ gcc a.c b.d
Undefined symbols for architecture x86_64:
   "__d_allocmemory", referenced from:
       _D1b4testFNaNbNfZDFNaNbNiNfZk in b.o