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Date: Thu, 19 Feb 2015 00:11:52 -0800
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To: Michael Wallner <mike@php.net>, Christoph Becker <cmbecker69@gmx.de>, 
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Subject: Re: [PHP-DEV] Digit separators for numeric literals
From: rasmus@lerdorf.com (Rasmus Lerdorf)

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On 02/18/2015 11:49 PM, Michael Wallner wrote:
> On 19/02/15 03:44, Rasmus Lerdorf wrote:
>=20
>> but _999_ would need to work as well and _ is a valid char in a consta=
nt
>> so you can have a constant named _999_.
>>
>=20
> Why would we need to support the underscore in front (and maybe even at=

> the end) of a number?

I guess we could restrict it to not be leading. I was thinking along the
lines of the character being defined to be ignored anywhere in a
literal. The underscore was actually rejected in C++14 because C++ has
user defined literals.

  http://en.cppreference.com/w/cpp/language/user_literal

which would then make 0x12_ab problematic. We obviously don't have
user-defined literals so we probably could make it work. Like I said,
that is the only viable option as far as I can see.

-Rasmus


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