Connecting input iterator to output iterator
Ok, so I have this code:
Code:
template <typename Iter, typename Ins>
bit8_to_ASCII (Iter begin, Iter end, Ins output) {
// Need this vector to hold intermediate values.
std::vector<unsigned char> bit6;
// Stretch the 8-bit values out to 6-bit values, store the result in vector bit6.
bit8_to_bit6 (begin, end, std::back_inserter(bit6));
// Translate the 6-bit values into ASCII values. Store the output in the
// output stream.
std::transform (bit6.begin(), bit6.end(), output, bit6_to_ASCII);
return;
}
Conceptually... vector bit6 is really not needed. It's just an artifact of the problem that I can't start std::transform until after the bit8_to_bit6 function is done. Is there some kind of inserter-wrapper I can use to take it out of the picture? Something like this maybe:
Code:
template <typename Iter, typename Ins>
bit8_to_ASCII (Iter begin, Iter end, Ins output) {
// No need to allocate an intermediate vector
// Whenever something is output to transforming_inserter, it calls bit6_to_ASCII
// on the input, and stores the result in output.
SOME_TYPE transforming_inserter = SOME_FUNCTION(output, bit6_to_ASCII);
// Stretch the 8-bit values out to 6-bit values, store the result in
// the custom inserter which will perform bit6_to_ASCII on the fly.
bit8_to_bit6 (begin, end, transforming_inserter);
return;
}
