On Friday, 1 May 2015 at 11:03:19 UTC, anonymous wrote:
If x_n is a constant (enum), you can use that to create a
function instead of a delegate:
----
void main() {
enum real x_n = 1;
real x_m = -1;
real function(real) s_n = z => F1(z, x_n);
auto J = jac(s_n, x_m);
}
----
If x_n is not constant, then the only way I see to make this
work, is to use a module variable:
----
real x_n;
void main() {
x_n = 1;
real x_m = -1;
real function(real) s_n = z => F1(z, x_n);
auto J = jac(s_n, x_m);
}
----
On Friday, 1 May 2015 at 06:48:46 UTC, John Colvin wrote:
A combination of std.functional.reverseArgs and
std.functional.partial might help. It's unfortunately we don't
have a version that can set an arbitrary argument, only the
first one; It would be an easy improvement to make.
Thank you both. I understood what you have shown to me.
About the chain 'reverseArg'+'partial' I reached to use it
partially, only the partial part; so it worked with exception of
reverseArg. I made several attempt to make it working but without
succes.
About the scope/declaration suggestion they worked, fine. I've
also made a change declaring x_s as static and worked as well
(without change of scope and without use of enum).
Unfortunatly I tried to exted the code by introducing array of
functions F1->[F1, F2, ...] and I saw such solution cannot apply.
That why because of built functions passed (as example) to lambda
function they do not store information. And I went back to
delegates that store the necessary data to create the correct
function. I've seen some method to pass from delegates to
function, but onestly I found a to complex approach and much more
a workaround that a good programming.
Going back to my study of D I will find the right way of thinking
to approch such problems (I imagine now the trick could be using
templates... I will see).
Thanks again. I've learned many things by looking at you solution.
