On Saturday, 1 October 2016 at 17:23:16 UTC, Uranuz wrote:
On Saturday, 1 October 2016 at 16:45:11 UTC, Uranuz wrote:
How to make rsplit (like in Python) in D without need for
extra allocation using standard library? And why there is no
algorithms (or parameter in existing algorithms) to process
range from the back. Is `back` and `popBack` somehow worse
than `front` and `popFront`.
I've tried to write somethig that would work without
allocation, but failed.
I have searching in forum. Found this thread:
https://forum.dlang.org/post/bug-1030...@http.d.puremagic.com%2Fissues%2F
I tried to use `findSplitBefore` with `retro`, but it doesn't
compile:
import std.stdio;
import std.algorithm;
import std.range;
import std.string;
void main()
{
string str = "Human.Engineer.Programmer.DProgrammer";
writeln( findSplitBefore(retro(str), ".")[0].retro );
}
Compilation output:
/d153/f534.d(10): Error: template std.range.retro cannot
deduce function from argument types !()(Result), candidates
are:
/opt/compilers/dmd2/include/std/range/package.d(198):
std.range.retro(Range)(Range r) if
(isBidirectionalRange!(Unqual!Range))
Why I have to write such strange things to do enough
wide-spread operation. I using Python at the job and there is
very much cases when I use rsplit. So it's very strange to me
that D library has a lot of `advanced` algorithms that are not
very commonly used, but there is no rsplit.
Maybe I missing something, so please give me some advice)
Sorry for noise. It was easy enough:
import std.stdio;
import std.algorithm;
import std.range;
import std.string;
void main()
{
string str = "Human.Engineer.Programmer.DProgrammer";
writeln( splitter(str, '.').back );
}
But I still interested why the above not compiles and how to do
`rfind` or indexOf from the right in D. I think even if we do
not have exactly algorithms with these names we could provide
some examples how to *emulate* behaviour of standard functions
from other popular languages)
But these example fails. Oops. Looks like a bug(
import std.stdio;
import std.algorithm;
import std.range;
import std.string;
void main()
{
string str = "";
writeln( splitter(str, '.').back );
}
core.exception.AssertError@std/algorithm/iteration.d(3132):
Assertion failure
----------------
??:? _d_assert [0x43dd1f]
??:? void std.algorithm.iteration.__assert(int) [0x4432b0]
??:? pure @property @safe immutable(char)[]
std.algorithm.iteration.splitter!("a == b", immutable(char)[],
char).splitter(immutable(char)[], char).Result.back() [0x43b8d6]
??:? _Dmain [0x43ae41]
??:?
_D2rt6dmain211_d_run_mainUiPPaPUAAaZiZ6runAllMFZ9__lambda1MFZv
[0x43e33e]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate()) [0x43e288]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).runAll() [0x43e2fa]
??:? void rt.dmain2._d_run_main(int, char**, extern (C) int
function(char[][])*).tryExec(scope void delegate()) [0x43e288]
??:? _d_run_main [0x43e1f9]
??:? main [0x43d049]
