Search implementation suggestions

[mclow]

Phil Endecott writes:

• The three algorithms have very similar interfaces. The docs could perhaps define a "searcher" concept and explicitly declare these algorithms' classes to be models of that concept.
• std::search is similar to the three algorithms' free function versions (congratulations on getting the arguments in the same order!). For completeness, how about adding a searcher class that uses std::search?
• It would sometimes be useful to have a variant of the constructor that takes a const char* pattern.
• The tables store ints. For patterns shorter than 256 characters I think that uint8_t would be sufficient, and would reduce the size of a table from 1024 or 2048 bytes to only 256 bytes. Similarly uint16_t or uint32_t could be used for larger patterns. It is not obvious how to implement this, though; perhaps an optional max_pattern_length template parameter, making it the user's responsibility to ensure the supplied pattern is not too long.

[mclow]

• const char * constructor

You can do that today with ( str, str + strlen (str), but I'll think about how to do it better.
Maybe just a specialization for char * (and wchar?)
The trick, I think, will be to avoid having a general pointer-based version that insists on null termination.