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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Question on speed of set operations
Date: Mon, 1 Apr 2019 16:43:49 -0500
Organization: JSA Research & Innovation
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"Simon Wright" <simon@pushface.org> wrote in message 
news:lyh8bl2s3u.fsf@pushface.org...
> reinert <reinkor@gmail.com> writes:
>
>> So what is the best alternative among the following tree procedures
>> for the above purpose (in terms of *speed*):
>
> If I were you I would do some benchmarking.

Agreed. I doubt that there is a portable answer; it would depend on the 
internal implementation of the container type (which is purposely left to 
the implementation).

                                         Randy.