== `sqlite/cstring_ref.hpp`

[#string_view]

The `sqlite::string_view` class is a https://en.cppreference.com/w/cpp/string/basic_string_view[std::string_view]
compatible class.

[#cstring_ref]

The `cstring_ref` class is a view type similar to a `string_view`, but with a guarantee that it is null-terminated.

It can be constructed from a raw `const char *` or any class that has a `c_str()` function returning a `const char *`.

Otherwise it is similar to a `string_view`, except that `substr(std::size_t())` will return a `cstring_ref`,
whereas a `substr(std::size_t(), std::size_t())` returns a `string_view`.