From: eg (egoots_at_[hidden])
Date: 2008-04-29 19:52:46
Edward Diener wrote:
> I have a filter, derived from multichar_output_filter, in which I am
> both prepending data and appending data. In other words the data being
> written to the sink will be greater than the data being passed into the
> filter's 'template<typename Sink> std::streamsize write(Sink&
> dest, const char* s, std::streamsize n)' member function, which my
> filter is implementing.
>
> Is this an allowable use of filters ?
yes.
>
> Do I still return the 'n' streamsize data being passed in or do I return
> the actual length of the data being written ?
>
From one of the tutorial examples:
template<typename Sink>
std::streamsize write(Sink& dest, const char* s, std::streamsize n)
{
// Consume up to n filtered characters from the buffer s,
// writing filtered characters to dest. Return the number
// of characters consumed.
}
> Can I use the
>
> 'template<typename T> std::streamsize write( T& t, const typename
> char_type_of<T>::type* s, std::streamsize n );'
>
> function to write the data,
yes