On Wednesday, 4 November 2015 at 12:25:31 UTC, Laeeth Isharc
wrote:
On Friday, 30 October 2015 at 10:35:03 UTC, Laeeth Isharc wrote:
I'm writing a talk for codemesh on the use of D in finance.
Sorry - I wrote this in a hurry, and I should have said on my
experience of using D in finance (not the whole sector, which
is absolutely enormous and very diverse), and what lessons and
general things might be useful for others considering D.
I can imagine lack of fixed point might be a problem.
Shouldn't this be in Phobos? If BigInt is, then why not fixed
point? There is this library here - had some problems
compiling it last time (dmd versions), but it seems at least
somewhat thought-through:
https://github.com/jaypha/fixed
train system ought to be sufficient to make that point...
This module is nice (except the fact that's using std.math.lround
all over the place which is available only on Linux) but, as I
thought, keeping just a scale is not enough for multiplication or
division:
Fixed!4 a = "1_000_000_000_000.0000";
Fixed!4 b = "0.5000";
Fixed!4 c = "2.0000";
writeln((a * b).asString) will output -53402322211.2865
writeln((a / c).asString) will output 38831398157.2612
That's because we have a multiplication overflow in both cases.
