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[Patch] reduce template instantiation depth in <variant>

From: Barrett Adair <barrettellisadair at gmail dot com>
To: libstdc++ at gcc dot gnu dot org
Date: Sat, 12 Nov 2016 01:12:52 -0600
Subject: [Patch] reduce template instantiation depth in <variant>
Authentication-results: sourceware.org; auth=none

Hi,

Currently, std::variant exceeds the default ftemplate-depth parameter
when instantiated with 297 types. This small patch increases this
ceiling to 446 types (from the bottom of the template stack).

This was accomplished by using fold expressions instead of the __and_ template.

Thanks,
Barrett

Attachment: variant_patch.diff
Description: Text document

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