On Wednesday, 2 June 2021 at 15:32:38 UTC, Sean wrote:
Hello
I have seen this :
https://forum.dlang.org/thread/1473526717.1917.20.ca...@winder.org.uk
Now, please consider this code:
import std.stdio;
import std.math;
import std.stdio;
import std.conv;
import std.format;
import std.math;
import std.algorithm;
import std.net.curl;
import std.json;
import std.path;
import std.array;
import std.net.curl;
import core.stdc.stdlib;
import std.datetime;
import std.file;
void main() {
auto a = new double[][] (0,0);
a ~= [ 1.0, 2.45];
a ~= [ 4.9 ,28, 9];
auto b = a.dup;
a[1] = remove(a[1],1);
writeln(b);
}
I compile with dmd version :
DMD64 D Compiler v2.096.1
Copyright (C) 1999-2021 by The D Language Foundation, All
Rights Reserved written by Walter Bright
Output :
[[1, 2.45], [4.9, 9, 9]]
What I would expect :
[[1, 2.45], [4.9, 28, 9]], because i am copying the array `a`
to a different place - at `b`.
Is this normal behavior of dup? if so, how can I get the
behavior i am searching for? Thank you.
it's rather an unintuitive behavior.
`.dup` is not a deep copy:
---
import std;
void main() {
auto a = new double[][] (0,0);
a ~= [ 1.0, 2.45];
a ~= [ 4.9 ,28, 9];
auto b = [a[0].dup, a[1].dup];
a[1] = remove(a[1],1);
writeln(b);
}
---
works as you expect
