[Xapian-tickets] [Xapian] #806: Project does not compile on VS2019 with C++20 turned on

[Xapian]

#806: Project does not compile on VS2019 with C++20 turned on
--------------------------+--------------------------------------
 Reporter:  Mateusz Pusz  |             Owner:  Olly Betts
     Type:  defect        |            Status:  new
 Priority:  normal        |         Milestone:
Component:  Other         |           Version:  1.4.17
 Severity:  normal        |        Resolution:
 Keywords:                |        Blocked By:
 Blocking:                |  Operating System:  Microsoft Windows
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Comment (by Olly Betts):

 Thanks for reporting this.

 The use of `mem_fun` I can fix, but I don't understand the `byte` issue.

 The `std::byte` type was added in C++17, and we already addressed that in
 C++ code in changeset:f527b61a65f259ce68b11ef9d89a959f5cf62a12 which
 should be in 1.4.17, and indeed all releases for over 2 years:

 {{{
 $ git tag --contains f527b61a65f259ce68b11ef9d89a959f5cf62a12
 v1.4.10
 v1.4.11
 v1.4.12
 v1.4.13
 v1.4.14
 v1.4.15
 v1.4.16
 v1.4.17
 v1.4.8
 v1.4.9
 }}}

 There's one remaining use of `typedef unsigned char byte;` but that's in C
 code, not C++.  Even if that C code gets compiled as C++ there's no
 `#include <cstddef>` or `using namespace std;` in that C code, so I can't
 see how that's a problem.

 Are you definitely seeing this with 1.4.17?  If so, can you show a log of
 the compiler errors you're getting, and also show the exact commands
 you're using to configure and build.
-- 
Ticket URL: <https://trac.xapian.org/ticket/806#comment:1>
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