parsing from std::string into a boost::string_view using boost::spirit::x3

Question

In my my previous question it was suggested that the performance of my boost::spirit::x3 parser could be improved by parsing into a boost::string_view

Answer 1

I'd simply write what you want:

v = boost::string_view(&*b, std::distance(b,e));

You might want to check that storage is contiguous¹ as a concept check for your input range. In that respect, it might be clearer to also require the iterator to be random-access, and write:

v = boost::string_view(&*b, e-b);

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¹ this is a requirement for string_view anyways