id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13105	Add missing top level include guards	anonymous	Douglas Gregor	"This ticket is addressed by this pull request:
https://github.com/boostorg/function/pull/13/files

The missing top level include guard means that even if boost/function.hpp is included in a pre-compiled header, we still pay the heavy boost pp pre-processing cost every time it is also included.

This is very problematic with Visual Studio intellisense:
It pre-process and parses the translation unit on the fly to provide syntax/semantic highlighting.

In our projects, this fix remove a couple of seconds in this process.
(boost/function.hpp is included in many headers that result in pre-processing it multiple time per compilation units)"	Bugs	new	To Be Determined	function	Boost 1.64.0	Problem