[Xapian-tickets] [Xapian] #785: Use std::string_view whenever possible

[Xapian]

#785: Use std::string_view whenever possible
-------------------------+-------------------------
 Reporter:  Kronuz       |             Owner:  olly
     Type:  enhancement  |            Status:  new
 Priority:  normal       |         Milestone:
Component:  Other        |           Version:
 Severity:  normal       |        Resolution:
 Keywords:               |        Blocked By:
 Blocking:               |  Operating System:  All
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Comment (by Kronuz):

 We could start by exposing an API which receives `const char*, size_t`
 instead of `const std::string&`, and internally try passing/using only
 functions receiving the former. Afterwards, adding support for string
 views is a matter of just exposing APIs that convert the string view to
 `const char*, size_t`:

 {{{
 void api_method(const char*, size_t);

 void api_method(std::string_view arg) {
     api_method(arg.data(), arg.size());
 }
 }}}

 Or we can create our own std::string_view (a mere wrapper maybe, when the
 real thing is available). String views are in basically that: `const
 char*, size_t` (or rather, actually, `const char* begin, const char* end`.

 String views have its quirks and at times get tricky, but the essence is
 at the end not constructing strings out of substrings.

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Ticket URL: <https://trac.xapian.org/ticket/785#comment:2>
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