Re: [boost] If boost::fusion is the hammer, then what's the nail?

From: Gennadiy Rozental (gennadiy.rozental_at_[hidden])
Date: 2006-12-20 02:39:17

"Joel de Guzman" <joel_at_[hidden]> wrote in message 
news:emag2s$6tk$1_at_sea.gmane.org...
>>> You obviously prefer variant, which is perfectly ok.
>>
>> I am not sure where I gave this impression.
>
> Here:
>
> "So my concluding is ... If I keep the values in vectors of
> variant anyway I obviously prefer variant based version."...

What I meant is:

Let's say you have a

class Record {
   typedef boost::variant<...>  field_value_t;

   std::vector<field_value_t> m_fields;
};

than in output function implementation I won;t use fusion, I will use my 
existing vector of variants.

But if I need to do the job on a fly, like here:

int index;
float balance;
Data d;
Time t;
info merchant;

output_csv( index, balance, merchant, d, t );
...

int index;
float amount;
Data d;
Time t;
location branch;

output_csv( index, branch, amount, d, t );

I would build output_csv implementation based on fusion.

Gennadiy