stdio line-streaming revisited

Andrei Alexandrescu (See Website For Email) SeeWebsiteForEmail at erdani.org
Thu Mar 29 11:57:34 PDT 2007


kris wrote:
> Andrei Alexandrescu (See Website For Email) wrote:
>> kris wrote:
>>
>>> Sean Kelly wrote:
>>> [snip]
>>>
>>>> I must be missing something.  Why is the following not acceptable?
>>>>
>>>>     import tango.io.Console;
>>>>
>>>>     void main()
>>>>     {
>>>>         char[] name;
>>>>         Cout( "Please enter your name: " ).flush;
>>>>         Cin.nextLine( name );
>>>>         Cout( "Hello, " )( name )( "!" );
>>>>     }
>>>
>>>
>>>
>>> There used to be a tango/example like this variation:
>>>
>>>     import tango.io.Console;
>>>
>>>     void main()
>>>     {
>>>         Cout ("Please enter your name: ").flush;
>>>         Cout ("Hello, ") (Cin.get);
>>>     }
>>
>>
>> Ah, also, the last line is translated into:
>>
>> Cout.opCall("Hello, ").opCall(Cin.get);
>>
>> D does not specify evaluation order, so the code might end up printing 
>> "Hello, " before reading the standard input. It's funny this does not 
>> happen exactly because of buffering, but the program has no control 
>> over the buffering so it should assume flushing could happen at any 
>> time. So the correct code is:
>>
>> auto name = Cin.get;
>> Cout("Hello, ")(name);
> 
> Well aware of that, thanks. BTW: evaluation order has been clarified 
> before, on a similar topic.

Is that clarification identical with the one posted by Frits?

Andreo



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