On Tuesday, 28 October 2014 at 16:07:38 UTC, MachineCode wrote:
I'm very surprise. If they either equal or fast sometimes the
compiler did great optizations or it's just a multicore
processor that's helping or what else? the first version (from
your post, the one using ranges) change in each
Hi,
I don't know if I'm missing something but I did some tests with
the popFront and popBack version:
bool isPalindrome(R)(R range)
if (isBidirectionalRange!(R))
{
while (!range.empty){
if (range.front != range.back) return false;
range.popFront();
On Tuesday, 28 October 2014 at 11:48:37 UTC, MattCoder wrote:
And in my benchmark test, the first version is 3x slower than
the second one.
I forgot to say that I'm compiling with DMD without any compiler
hints/optimizations.
Matheus.
On Monday, 27 October 2014 at 22:53:57 UTC, Nordlöw wrote:
Why bidirectional range only?
popBack() only for
I mean: you should write a different version for
non-bidirectional ranges too :)
On Tuesday, 28 October 2014 at 11:51:42 UTC, MattCoder wrote:
I forgot to say that I'm compiling with DMD without any
compiler hints/optimizations.
Try compiling with DMD flag
-release
and perhaps also
-release -noboundscheck
to get relevant results.
DMD is currently not that good at
On Tuesday, 28 October 2014 at 13:30:05 UTC, Nordlöw wrote:
On Tuesday, 28 October 2014 at 11:51:42 UTC, MattCoder wrote:
I forgot to say that I'm compiling with DMD without any
compiler hints/optimizations.
Try compiling with DMD flag
-release
and perhaps also
-release -noboundscheck
to
On Tuesday, 28 October 2014 at 14:09:50 UTC, MattCoder wrote:
Now with: -release -noboundscheck they are equal and sometimes
your version is slightly faster by ~3 milliseconds.
That is great to hear!
You should try profiling with ldc aswell.
On Tuesday, 28 October 2014 at 14:09:50 UTC, MattCoder wrote:
On Tuesday, 28 October 2014 at 13:30:05 UTC, Nordlöw wrote:
On Tuesday, 28 October 2014 at 11:51:42 UTC, MattCoder wrote:
I forgot to say that I'm compiling with DMD without any
compiler hints/optimizations.
Try compiling with DMD
On Sunday, 26 October 2014 at 20:38:29 UTC, Nordlöw wrote:
On Friday, 24 October 2014 at 22:29:12 UTC, Peter Alexander
wrote:
Further, I would like to extend isPalindrome() with a minimum
length argument minLength that for string and wstring does
I extended my algorithm with a minLength
On Monday, 27 October 2014 at 12:10:59 UTC, Marc Schütz wrote:
You could add an early `return false;` if the range has length
and it is less than minLength.
See update :)
Thanks!
On Monday, 27 October 2014 at 16:59:19 UTC, Nordlöw wrote:
On Monday, 27 October 2014 at 12:10:59 UTC, Marc Schütz wrote:
You could add an early `return false;` if the range has length
and it is less than minLength.
See update :)
Thanks!
And you can return true if length = 1
Why
On Monday, 27 October 2014 at 21:28:17 UTC, Andrea Fontana wrote:
And you can return true if length = 1
Thanks.
Why bidirectional range only?
popBack() only for
http://dlang.org/phobos/std_range.html#isBidirectionalRange
On Friday, 24 October 2014 at 22:29:12 UTC, Peter Alexander wrote:
Further, I would like to extend isPalindrome() with a minimum
length argument minLength that for string and wstring does
I extended my algorithm with a minLength argument
On Fri, Oct 24, 2014 at 09:56:18PM +, Nordlöw via Digitalmars-d-learn
wrote:
I would appreciate comments on my palindrome predicate function
bool isPalindrome(R)(in R range) @safe pure
if (isBidirectionalRange!(R))
{
import std.range: retro, take;
import std.algorithm:
On Friday, 24 October 2014 at 21:56:20 UTC, Nordlöw wrote:
bool isPalindrome(R)(in R range) @safe pure
Aside: for templates, just let the compiler infer @safe and pure.
You don't know whether the range operations on R are pure or not.
As for the actual algorithm, there's no need for the
On Friday, 24 October 2014 at 22:29:12 UTC, Peter Alexander wrote:
On Friday, 24 October 2014 at 21:56:20 UTC, Nordlöw wrote:
bool isPalindrome(R)(in R range) @safe pure
Aside: for templates, just let the compiler infer @safe and
pure. You don't know whether the range operations on R are
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