How to convert boost::string_view to std::string_view?

Question

I'm using a boost library which uses boost::string_view. However, I would like to use std::string_view in my code.
Q: What's the best way to convert between these two?

At the moment I'm using:

void foo(std::string_view sv) {
# ...
}
void foo(boost::string_view bsv) {
  foo(std::string(bsv));
}

But this creates an unnecessary string.

Maxim Egorushkin · Accepted Answer · 2019-04-02 13:31:30Z

9

One way:

void foo(std::string_view sv);

inline void foo(boost::string_view bsv) {
  foo(std::string_view(bsv.data(), bsv.size()));
}

Make sure to pass the length into std::string_view otherwise it calls Traits::length (std::strlen) unnecessarily.

edited Apr 2, 2019 at 13:31

answered Apr 2, 2019 at 13:26

Maxim Egorushkin

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IMelker · Accepted Answer · 2021-03-24 06:50:45Z

5

Or you can switch beast using it's own string_view to std::string_view, by providing definition of BOOST_BEAST_USE_STD_STRING_VIEW

answered Mar 24, 2021 at 6:50

IMelker

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1 Comment

David Over a year ago

Since boost-1.83.0 BOOST_BEAST_USE_STD_STRING_VIEW is no longer available: boost.org/doc/libs/1_83_0/libs/beast/doc/html/beast/…

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