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[PATCH] PR libstdc++/83600 fix end iterator for unready std::match_results

From: Jonathan Wakely <jwakely at redhat dot com>
To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Wed, 27 Dec 2017 22:22:36 +0000
Subject: [PATCH] PR libstdc++/83600 fix end iterator for unready std::match_results
Authentication-results: sourceware.org; auth=none

match_results::begin() and match_results::end() are required to work
even when the object is not ready, so the current definition of end()
is broken (it performs an undefined subtraction to return an invalid
iterator).

	PR libstdc++/83600
	* include/bits/regex.h (match_results::end()): Return valid iterator
	when not ready.
	* testsuite/28_regex/match_results/ctors/char/default.cc: Check that
	unready objects are empty and have equal begin and end iterators.
	* testsuite/28_regex/match_results/ctors/wchar_t/default.cc: Likewise.

Tested powerpc64le-linux, committed to trunk. Backports to follow.

Attachment: patch.txt
Description: Text document

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