Interfacing D to C R standalone math library

[Mike Parker]

On 5/31/2012 9:40 PM, TJB wrote:
> One more question, if I may. I noticed that I forgot to include the
> set_seed function. The call to rnorm works the way I have called it, but
> it must be using some default seed (its a random number generator).
>
> I have tried including the set_seed function as follows:
>
> import std.stdio;
>
> extern (C) void set_seed(unsigned int, unsigned int);
> extern (C) double rnorm(double, double);
>
> void main() {
> set_seed(0,77991);
> foreach(i; 0 .. 100) {
> writeln(myfunc(0.0, 1.0));
> }
> }
>
> double myfunc(double a, double b) {
> return rnorm(a, b);
> }
>
> I compile this the same way as you suggest, but now the compiler is
> squealing at me with the following message:
>
> $ dmd rnorm.d -L-L/usr/lob -L-lRmath -L-lm
> rnorm.d(6): found 'int' when expecting ')'
> rnorm.d(6): semicolon expected following function declaration
> rnorm.d(6): Declaration expected, not ','
>
> When I grep set_seed in Rmath.h I get:
>
> $ grep set_seed Rmath.h
> void set_seed(unsigned int, unsigned int);
>
> So I think I have called it correctly. Any thoughts or suggestions?
>
> Thanks, you have been so helpful!
>
> TJB
>
>

D doesn't know anything about C's 'unsigned int'. You need to convert 
parameters to the equivalent in D, which would be uint.

  extern (C) void set_seed(unsigned int, unsigned int);

See the following page for more info on interfacing with C:

http://dlang.org/interfaceToC.html