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[PATCH] Simplify std::rethrow_if_nested definition

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: Tue, 11 Oct 2016 11:41:43 +0100
Subject: [PATCH] Simplify std::rethrow_if_nested definition
Authentication-results: sourceware.org; auth=none

Originally this header didn't use <type_traits>, but we install that
for freestanding builds now, so it's always available. That means we
can simplify things a bit, using remove_reference, enable_if etc.

This also implements the missing part of LWG 2484, so that we don't
try to use dynamic_cast when the static type would make it ill-formed.

	* doc/xml/manual/intro.xml: Document LWG 2484 status.
	* libsupc++/nested_exception.h (_Throw_with_nested_impl)
	(_Throw_with_nested_helper): Remove.
	(__throw_with_nested_impl): New overloaded functions to implement
	throw_with_nested logic.
	(throw_with_nested): Call __throw_with_nested_impl.
	(_Rethrow_if_nested_impl): Remove
	(__rethrow_if_nested_impl): New overloaded functions to implement
	rethrow_if_nested logic.
	(rethrow_if_nested): Call __rethrow_if_nested_impl.
	* testsuite/18_support/nested_exception/rethrow_if_nested.cc: Test
	problem cases from LWG 2484.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document

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