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We leave the parameter tokens alone, considering it constant, while
the parameter vec_out is used to hold the new stream of tokens. This
allows the caller to have a before and after view on the token stream
and reduces the worry of double frees.
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vec.clear() doesn't delete pointers (unless they're smart) so I need
to do it myself.
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They copy and construct new token vectors and just read the token
inputs.
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Once again quite similar to preprocess_macro_blocks but shorter,
easier to use and easier to read. (76 vs 109)
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Another great thing for C++: the ability to tell it how to print
structures the way I want. In C it's either:
1) Write a function to print the structure out (preferably to a file
pointer)
2) Write a function to return a string (allocated on the heap) which
represents it
Both are not fun to write, whereas it's much easier to write this.
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While being very similar in style to the C version, it takes 27 lines
of code less to implement it due to the niceties of C++ (41 lines vs
68).
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I've decided to split the module parsing into two modules, one for the
preprocessing stage which only deals with tokens and the parsing stage
which generates bytecode.
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