This abstract base class represents an RFC 4790 Collation.
"A collation is a named function which takes two arbitrary length strings as input and can be used to perform one or more of three basic comparison operations: equality test, substring match, and ordering test."
Creates a new Collation.
= 0; Returns 0 if a and b are equal; and -1 if a is smaller, or 1 if a is greater, than b.
= 0; Returns true if a contains b, i.e. if b is a substring of a, and false otherwise.
Returns a pointer to a newly-created Collation object corresponding to s, or 0 if no such collation is recognised.
= 0; Returns true if a and b are equal according to this Collation, and false otherwise.
Returns a list of all collations implementated. The list is allocated for the purpose and may be changed by the caller. The names are sorted alphabetically.
= 0; Returns true if s is valid input to this Collation, and false otherwise.
Boilerplate virtual destructor.
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