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* removes need for defining codepoints as numeric literals
* they are now defined as UTF-32 encoded string literals
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* operator- takes a reference to a const std::string::const_iterator and as such enables determining the actual position of a codepoint within a string
* ranged for loops in test cases now take the iterator value by rvalue reference instead of by value
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* CodepointIterator is a simple C++ iterator class which iterates through unicode codepoints in a UTF8-encoded string
* It is derived from std::iterator and implements the std::bidirectional_iterator_tag
* Dereferencing an instance of the class provides the codepoint as char32_t
* Tests require Google Test and use UTF8-samples from http://www.columbia.edu/~fdc/utf8/
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