Function Template `invert`

Description
Headers
Reference

Description

The class template inverse is an adapter which transforms an InputFilter into an OutputFilter or vice versa. The function template invert is an object generator which when passed a Filter returns a instance of an appropriate specialization of inverse.

Given an InputFilter f, the inverse of f is Multi-Character OutputFilter whose member function write is implemented as follows. Given a Sink snk and a character buffer s of length n, we

construct a Source based on the buffer s and compose it with f to form a Source, then
repeatedly read sequences of characters from the composite Source and write them to snk until the buffer s is exhausted.

Similarly, given an OutputFilter f, the inverse of f is Multi-Character InputFilter whose member function read is implemented as follows. Given a Source src and a character buffer s of length n, we

construct a Sink based on the buffer s and compose it with f to form a Sink, then
repeatedly read sequences of characters from src and write them to the composite Sink until the buffer s is full.

The mode of a specialization of inverse is equal to output if the mode of the underlying filter refines input, and to input otherwise.

Headers

<boost/iostreams/invert.hpp>

Reference

Synopsis

namespace boost { namespace iostreams {

template<typename Filter>
class inverse {
public:
    typedef typename char_type_of<Filter>::type  char_type;
    typedef see above                            mode;

    inverse(const Filter& filter);

    // Filter member functions
};

template<typename Filter>
inverse<Filter> invert(const Filter& filter);

} } // End namespace boost::io

Class Template `inverse`

Template parameters

Filter

A model of Filter

`inverse::inverse`

    inverse(const Filter& filter);

Constructs an instance of inverse based on the given filter.