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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Is Text_IO.Put_Line() thread-safe?
Date: Fri, 15 Jun 2012 06:04:37 +0100
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Date: 2012-06-15T06:04:37+01:00
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Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org> writes:

> On 06/14/2012 03:40 PM, Simon Wright wrote:
>> Jeffrey Carter<spam.jrcarter.not@spam.not.acm.org>  writes:
>>
>>> For decades the standard design for plumbing was 2 separate faucets
>>> (hot and cold) each with its own valve. That's a terrible design from
>>> a usability standpoint.
>>
>> Personally I find it a highly usable design.
>
> If all you ever do is fill a receptacle (sink/tub) with water,
> sure. But suppose you want to wash your hands in water warmer than the
> water from the cold tap, and cooler than the water from the hot tap,
> and rinse them in clean water of the same temperature.
>
> With 2 taps:
>
[accurate description of process for washing hands if you need enough
water that you can't complete the process under just the hot tap without
scalding yourself]
>
> With a single faucet and independent temperature and pressure controls:
>
> Adjust pressure
> Adjust temperature
[swearing horribly because you can't work out how to use the unfamiliar
controls and getting the tap dirty so that you have to rinse it off
later]
> Wash hands
[swearing horribly because you manage to knock the unfamiliar controls
and scald yourself]
> Rinse hands
> Turn off water

> Of course, 2 separate taps are hopeless for showering ...

A different use case. Though, see above about horrible swearing.