Lambda functions in D

[Russel Winder via Digitalmars-d-learn]

On Sat, 2015-05-09 at 09:49 -0700, Ali Çehreli via Digitalmars-d-learn wrote:
> 
[…]
> BigInt factorial(size_t n)
> {
>      return bigInts(1).take(n).reduce!((a, b) => a *= b);
> }

I wonder if that should be a * b rather than a *= b?

It turns out that 2.067 fixes the integrality of BigInts so:

    reduce!"a * b"(one, iota(BigInt(one), n + one));

works fine – one is immutable(BigInt(1)).

Many interesting performance issues around using take versus iota.

-- 
Russel.
=============================================================================
Dr Russel Winder      t: +44 20 7585 2200   voip: sip:russel.winder at ekiga.net
41 Buckmaster Road    m: +44 7770 465 077   xmpp: russel at winder.org.uk
London SW11 1EN, UK   w: www.russel.org.uk  skype: russel_winder


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