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abstract sclass CharacterClassIterator { // move method (go to next character) // callee can assume that c is compatible with canAcceptChar abstract void acceptChar(char c); // query methods about next character abstract bool canEndHere(); abstract bool canAcceptChar(char c); // together, the following 2 methods define a inclusive character range. // this character range must contain all the characters that // are accepted by canAcceptChar at the current position. // character range should be interpreted in a way compatible with an agreed-on char comparator. abstract char minCharAccepted(); abstract char maxCharAccepted(); }