Proposal for SentinelInputRange

[Timon Gehr]

On 02/28/2013 02:18 AM, John Colvin wrote:
> On Thursday, 28 February 2013 at 01:14:31 UTC, Timon Gehr wrote:
>> On 02/28/2013 02:11 AM, Walter Bright wrote:
>>> A SentinelInputRange is an InputRange with the following additions:
>>>
>>> 1. a compile time property 'sentinel' that is the terminating value of
>>> the range
>>> 2. empty is defined as: empty = (front == sentinel)
>>> 3. it is not necessary for empty to be called before front
>>>
>>> A C style 0-terminated string is an example of a SentinelInputRange.
>>>
>>> The additions to std.range would be:
>>>
>>> 1. isSentinelInputRange(T) which returns true if T is a
>>> SentinelInputRange
>>> 2. a unittest
>>> 3. documentation of this
>>>
>>> An addition to std.string would be a function that takes a char* and
>>> returns a SentinelInputRange.
>>>
>>> Motivation:
>>> 1. easy conversion of C strings to ranges
>>> 2. necessary for a fast implementation of a lexer
>>>
>>> Any takers?
>>
>>
>> This is not general enough. The concept is not exclusive to input ranges.
>
> I presume you're remembering that if something is a forward,
> bidirectional or random access range it is also an input range.
>
> What further generality would you want?

Never mind. I was confused.