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[PATCH] Implement LWG 2686, hash<error_condition>

From: Daniel Krügler <daniel dot kruegler at gmail dot com>
To: "libstdc++" <libstdc++ at gcc dot gnu dot org>, gcc-patches List <gcc-patches at gcc dot gnu dot org>
Date: Sun, 12 Mar 2017 13:16:51 +0100
Subject: [PATCH] Implement LWG 2686, hash<error_condition>
Authentication-results: sourceware.org; auth=none

The following is an *untested* patch suggestion, please verify.

Notes: My interpretation is that hash<error_condition> should be
defined outside of the _GLIBCXX_COMPATIBILITY_CXX0X block, please
double-check that course of action.

I noticed that the preexisting hash<error_code> did directly refer to
the private members of error_code albeit those have public access
functions. For consistency I mimicked that existing style when
implementing hash<error_condition>.

- Daniel

Attachment: lwg2686.patch
Description: Binary data

Attachment: ChangeLog_lwg2686.patch
Description: Binary data

Follow-Ups:
- Re: [PATCH] Implement LWG 2686, hash<error_condition>
  - From: Daniel Krügler
- Re: [PATCH] Implement LWG 2686, hash<error_condition>
  - From: Jonathan Wakely

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