id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11203	boost::none compile errors with MSVC	raad@…	akrzemi1	"The new boost::none in 1.58 doesn't compile on MSVC when using precomiled headers.

Code to reproduce the problem:

precompiled header stdafx.h:
{{{
#include <boost/optional.hpp>
}}}

s.cpp:
{{{
#include ""stdafx.h""

struct s {
 void f(boost::optional<int> const& = boost::none) {}
};
}}}

On MSVC12, this results in the error message:
{{{
s.cpp(3): error C3083: ' ?? A0x06d21c56': the symbol to the left of a '::' must be a type
}}}

Defining BOOST_OPTIONAL_USE_OLD_DEFINITION_OF_NONE works around the problem, but I haven't found it documented anywhere."	Bugs	closed	Boost 1.60.0	optional	Boost 1.58.0	Problem	fixed		marci_r@…