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Re: switch with case 0 [message #182614 is a reply to message #182598]

Sat, 17 August 2013 20:14

Thomas Mlynarczyk
Messages: 131
Registered: September 2010

Karma:

Senior Member

Peter H. Coffin schrieb:

[PHP should never implicitly parse out anything from a string]

> But the only way to do that that's consistent is to drop "loosely typed"
> entirely,

No. Why? Other (loosely typed) languages work just fine. Because instead
of implicitly casting a string to an integer, they rather cast the
integer to a string. And there's a most natural way to do that: just use
the syntax for the respective number literal in that language (if
several different ones are possible, use the shortest representation).
Thus there are no "locale issues". (For locale specific number
formatting, there are dedicated functions.)

> Strong-typing introduces its own complications: Are we going to cast
> implicitly between numeric types? It's easy to say "Sure, that's okay"
> but we're IMMEDIATELY up against float rounding and questions of "Do we
> want an explicity DECIMAL type?" and how to compare them.

If the target type is "larger" (wider range of values) and/or "more
precise" (more decimals) than the source type, there should be no
problem. The other way round, a (lossless) type conversion may not be
possible. In that case the language could either throw an exception or
still perform the conversion with some information loss if reasonably
acceptable. E.g. if you convert a float(3.14) to int, it's clear that
the decimals will have to be dropped and the result will be int(3).
Converting a float larger than PHP_INT_MAX to int could only result in
PHP_INT_MAX (what else? `null` possibly?). Both are acceptable when done
*explicitly*. But the language should not perform such lossy conversions
*implicitly*.

Greetings,
Thomas

--
Ce n'est pas parce qu'ils sont nombreux à avoir tort qu'ils ont raison!
(Coluche)

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[Message index]

		switch with case 0 By: Fiver on Sat, 17 August 2013 04:55
		Re: switch with case 0 By: J.O. Aho on Sat, 17 August 2013 06:35
		Re: switch with case 0 By: The Natural Philosoph on Sat, 17 August 2013 07:29
		Re: switch with case 0 By: Luuk on Sat, 17 August 2013 07:51
		Re: switch with case 0 By: Thomas Mlynarczyk on Sat, 17 August 2013 11:16
		Re: switch with case 0 By: Peter H. Coffin on Sat, 17 August 2013 15:56
		Re: switch with case 0 By: The Natural Philosoph on Sat, 17 August 2013 16:45
		Re: switch with case 0 By: Tim Streater on Sat, 17 August 2013 17:58
		Re: switch with case 0 By: The Natural Philosoph on Sat, 17 August 2013 18:39
		Re: switch with case 0 By: Thomas Mlynarczyk on Sat, 17 August 2013 19:36
		Re: switch with case 0 By: Thomas Mlynarczyk on Sat, 17 August 2013 20:14
		Re: switch with case 0 By: Norman Peelman on Sat, 17 August 2013 17:56
		Re: switch with case 0 By: Thomas Mlynarczyk on Sat, 17 August 2013 19:55
		Re: switch with case 0 By: The Natural Philosoph on Sat, 17 August 2013 20:04
		Re: switch with case 0 By: Thomas Mlynarczyk on Sat, 17 August 2013 20:32
		Re: switch with case 0 By: Richard Yates on Sat, 17 August 2013 22:20
		Re: switch with case 0 By: Fiver on Sat, 17 August 2013 20:37
		Re: switch with case 0 By: Norman Peelman on Sat, 17 August 2013 23:26
		Re: switch with case 0 By: The Natural Philosoph on Sun, 18 August 2013 11:54
		Re: switch with case 0 By: Norman Peelman on Sun, 18 August 2013 00:23
		Re: switch with case 0 By: Thomas Mlynarczyk on Sun, 18 August 2013 13:22
		Re: switch with case 0 By: Norman Peelman on Sun, 18 August 2013 15:20
		Re: switch with case 0 By: Thomas Mlynarczyk on Sun, 18 August 2013 16:28
		Re: switch with case 0 By: Norman Peelman on Sun, 18 August 2013 19:16
		Re: switch with case 0 By: Norman Peelman on Sun, 18 August 2013 22:04
		Re: switch with case 0 By: Thomas Mlynarczyk on Sun, 18 August 2013 22:17
		Re: switch with case 0 By: Thomas Mlynarczyk on Sun, 18 August 2013 22:13
		Re: switch with case 0 By: The Natural Philosoph on Sun, 18 August 2013 23:35
		Re: switch with case 0 By: Norman Peelman on Mon, 19 August 2013 10:30
		Re: switch with case 0 By: Norman Peelman on Mon, 19 August 2013 02:13
		Re: switch with case 0 By: Thomas Mlynarczyk on Mon, 19 August 2013 17:55
		Re: switch with case 0 By: Thomas 'PointedEars' on Mon, 19 August 2013 08:18
		Re: switch with case 0 By: Thomas Mlynarczyk on Mon, 19 August 2013 17:39
		Re: switch with case 0 By: Fiver on Sat, 17 August 2013 14:15
		Re: switch with case 0 By: Norman Peelman on Sat, 17 August 2013 17:28

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