I have an array of self-written class A. I'm sorry for my tactlessness, but I'm confused about the modules. How do I correctly find a specific object fragment inside the array and delete it? I don't quite understand which modules to use to do this optimally.

A[] arr;
A fragment = new A;
...
arr.remove(fragment);  // Something like

In the pros, I would do it this way, for example via lambda

arr.erase(std::find_if(arr.cbegin(), arr.cend(), [&](const std::reference_wrapper<A> &item)
{
    return &item.get() == &fragment;
}));

On Thursday, 10 November 2022 at 23:36:29 UTC, H. S. Teoh wrote:

A[] arr;
A fragment = new A;
...
arr.remove(fragment);  // Something like

As always - simple and compact. Thank you:)

On Friday, 11 November 2022 at 00:02:09 UTC, Alexander Zhirov wrote:

import std.algorithm;
arr = arr.remove(arr.countUntil(fragment));

And will this method work?

A[] arr;
A fragment = new A;
...
remove(current => current == fragment)(arr);

On Friday, 11 November 2022 at 05:36:37 UTC, Alexander Zhirov wrote:

import std.algorithm;
arr = arr.remove(arr.countUntil(fragment));

A[] arr;
A fragment = new A;
...
remove(current => current == fragment)(arr);

And it will be even more accurate so as not to cause an error:

A[] arr;
A fragment = new A;
...
arr = remove(current => current == fragment)(arr);

On Friday, 11 November 2022 at 06:10:33 UTC, Alexander Zhirov wrote:

import std.algorithm;
arr = arr.remove(arr.countUntil(fragment));

A[] arr;
A fragment = new A;
...
remove(current => current == fragment)(arr);

A[] arr;
A fragment = new A;
...
arr = remove(current => current == fragment)(arr);

You forgot the exclamation mark. And UFCS allows you to put arr in front, making it a bit easier on the eyes:

arr = arr.remove!(current => current == fragment);