Re: [boost] [relational] Relational Model Library

From: Larry Evans (cppljevans_at_[hidden])
Date: 2005-10-02 18:41:50

On 10/02/2005 06:07 PM, Reece Dunn wrote:
> Larry Evans wrote:
[snip]
>>and this would lead to the readability problem which
>>Jonathan repeated in:
>>
>>   http://lists.boost.org/Archives/boost/2005/10/94661.php
> 
> 
> True. Here, macros would be needed for something like:
> 
>     BOOST_CREATE_TABLE( mytable,
>        BOOST_TABLE_ROW( first_name, std::string )
>        ...
>     );
Or, something like that shown in:

http://lists.boost.org/Archives/boost/2005/09/94418.php

which contains:

RM_DEFINE_ROW(xxx,((int,a_int))((float,a_float)));

where the correspondence with the above BOOST_CREATE_TABLE(...) is:

    xxx      mytable
    a_int    first_name
    int      std:string
    a_float  ?
    float    ?

> 
> but this would no longer be a tuple :(. 

True.  What are the advantages of a tuple that would
outweigh the readability disadvantage mentioned by
both Jonathan and Calum?

> Unless you have something like:
> 
>     struct people
>     {
>        typedef tuple< ... > table;
>        static const int first_name = 0;
>     };
> 
> then the macro definition breaks :(.

Sorry, I'm not following you.  Why would you need something
like the above 'struct people' when RM_DEFINE_ROW would
suffice?