Re: [boost] Re: Is output formatting like Spirit? Was: Re: Formal reviewof "Output Formatters" library begins today

From: John Torjo (john.lists_at_[hidden])
Date: 2004-09-24 04:00:54

Reece Dunn wrote:

> Larry Evans wrote:
> 
>> On 09/23/2004 02:35 PM, Hartmut Kaiser wrote:
>> [snip]
>>
>>> My point wasn't the concrete syntax, this is volatile at this stage 
>>> anyway.
>>> My point was the concept to implement a library, which is 'dual' to 
>>> Spirit,
>>> based on the idea, that a grammar describes all possible matchable input
>>> sequences, so why not use this 'grammar' to specify, how to generate 
>>> this
>>> input sequences.
>>
>>
>> Also, couldn't these 'dual' libraries be used to generate test cases
>> for each other?
> 
> 
> Sure. This would be good for performing a feature-by-feature comparison. 
> Hooking the machinery into Boost.Test would be a good way of getting the 
> results. Naturally, the test cases for each library should pass their 
> own tests on supported platforms; the interesting cases will be the test 
> cases from the other libraries.
> 
> How do we implement the tests? I suggest that we split the information 
> into:
> 
> [1] the data type (type) being formatted, e.g. std::map< std::string, 
> std::string > with the details of its contents;
> 
> [2] for output -- the string (str) such that:
>    type val = ...;
>    ostringstream ss;
>    ss << some_fn( val );
>    BOOST_TEST( ss.str() == str );
> 

I think there's a wrap_stringstream() in the sandbox.
You could then do:

BOOST_TEST( (wrap_strinstream() << some_fn(val)) == str);

Best,
John

-- 
John Torjo
-- john_at_[hidden]
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