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Similar principle to pp_err_t in that a structure provides the
opportunity for more information about the error such as location.
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This removes the problem of possibly expensive copies occurring due to
working with tokens produced from the lexer (that C++ just... does):
now we hold pointers where the copy operator is a lot easier to use.
I want expensive stuff to be done by me and for a reason: I want to
be holding the shotgun.
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This makes enum elements scoped which is actually quite useful as I
prefer the namespacing that enum's give in C++.
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Note that this is basically the same as the previous version,
excluding the fact that it uses C++ idioms more and does a bit better
in error checking.
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Essentially a refactor of the C formed lexer into C++ style. I can
already see some benefits from doing this, in particular speed of
prototyping.
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