bidirectional iterator over file/ifstream

Question

I need an input file stream which would have a bidirectional iterator/adapter.

Unfortunately std::ifstream (and similar) can be used only with std

Answer 1

Since you're already using boost, take a look at boost::iostreams::mapped_file_source http://www.boost.org/doc/libs/release/libs/iostreams/doc/classes/mapped_file.html#mapped_file_source

You can use file.data() as the begin iterator and file.data() + file.size() as the end iterator.