Re: [boost] [system] system_error first draft

From: Gennaro Prota (gennaro_prota_at_[hidden])
Date: 2006-07-05 12:59:21

Hi Beman,

apologies for the very late reply. I postponed it and then always
forgot :(

>AFAICR, the question never came up. I can't remember why I started calling 
>it filesystem rather than file_system, but suspect I was influenced by other 
>material I read at the time. Try googling for "filesystem", and you can see 
>some examples.

Seen. Both forms are common; at the moment, though, Google's search
results for "file system" (in quotes) are almost twice as much those
for filesystem (about 60,000,000 vs. 30,000,000). Any hope for it to
become "file_system"?

>> That said, the wording at the url you provide still perplexes me:
>>
>>    Type system_error_type [now sysno_t] is the implementation-defined
>>    type used by the operating system to report error codes.
>>
>> [...]
>
>It is whatever the operating system's API uses to report errors. If there is 
>a layer between the C++ program and the operating system, like cygwin, it is 
>what that middle layer's API exposes.

Ok. So the wording needs some tweak (I know it is difficult to do in
standardese, sorry for that).

>> My preferred name, FWIW, is still native_system_error[_type].
>
>Seems too wordy to me.

Now that you told about middle layers being considered, what about
"system_api_error"? Or should it necessarily have _t/_type at the end?

>>>> [...]
>
>I'm not seeing how this applies to class error code (which does not use 
>strings at all), unless you are suggesting that stream inserters and 
>extractors be provided.

I'm a bit lost in all the renaming we have done so far :) Anyhow, at
the url you provided:

<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1975.html#Diagnostics-library>

the class system_error has the following constructor:

 system_error(const std::string & what_arg, error_code ec);

>>>> [snipped suggestion to file a full paper]
>>>
>>>I'm not sure which constructors you are looking at. The only converting
>>>constructor I see is already explicit.

As I said I was only looking at the online document; there

 error_code(system_error_type err);

is not declared explicit.

--
[ Gennaro Prota, C++ developer for hire ]
[    resume:  available on request      ]