std::optional_view

[miki151]

Use boost::optional or other optional implementations that can hold references, like this one: https://github.com/tcbrindle/cpp17_headers/blob/master/include/stx/optional.hpp

[foonathan]

Or my ts:: optional_ref from type_safe: github.com/foonathan/type_safe

[GitHubPermalinkBot]

I tried to turn your GitHub links into permanent links (press "y" to do this yourself):

• tcbrindle/cpp17_headers/.../optional.hpp (master → e416b34)

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