From: Soeren Apel <soeren@apelpie.net>
Date: Sun, 21 Jan 2018 13:28:27 +0000 (+0100)
Subject: Rework the callback mechanism for the global settings
X-Git-Url: http://git.code-monkey.de/?a=commitdiff_plain;h=d0c0573b3ee694827a747727f862c5f91736ca05;hp=d0c0573b3ee694827a747727f862c5f91736ca05;p=pulseview.git

Rework the callback mechanism for the global settings

Up to now, registered callbacks could not be unregistered
because std::function does not permit comparing for equality.

Using an interface class removes the need for std::function,
making the mechanism a little less elegant but at least fully
functional.
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