1////
2Copyright 2003-2017 Beman Dawes
3
4Distributed under the Boost Software License, Version 1.0.
5
6See accompanying file LICENSE_1_0.txt or copy at
7http://www.boost.org/LICENSE_1_0.txt
8////
9
10[#history]
11# History
12:idprefix: history_
13
14http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1975.html[N1975],
15Filesystem Library Proposal for TR2, accepted for Library Technical
16Report 2 (TR2) at the Berlin meeting, included additional components to
17supplement the Standard Library's Diagnostics clause. Since then, these error
18reporting components have received wider public scrutiny and enhancements have
19been made to the design. The enhanced version has been used by
20http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2054.pdf[N2054],
21Networking  Library Proposal for TR2, demonstrating that these error reporting
22components are useful beyond the original Filesystem Library.
23
24The original proposal viewed error categories as a binary choice between
25`errno` (i.e. POSIX-style) and the native operating system's error
26codes. The proposed components now allow as many additional error categories as
27are needed by either implementations or by users. The need to support additional
28error categories, for example, occurs in some networking library implementations
29because they are built on top of the POSIX `getaddrinfo` API that
30uses error codes not based on `errno`.
31