id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12158	boost::size() and friends should use an ADL barrier like boost::begin	Tavian Barnes <tavianator@…>	Neil Groves	"boost::begin() and boost::end() are nicely declared in an ADL barrier namespace to avoid conflicts with code like this:

{{{
using std::begin;
auto i = begin(c);
}}}

[http://isocpp.org/files/papers/n4280.pdf N4280] has been accepted into C++17, which adds std::size, std::empty, and std::data.  But if users attempt to use those in the same way:

{{{
using std::size;
auto s = size(c);
}}}

They may get an error.  For example, if c is a std::vector<boost::shared_ptr<int>> or something, boost::size() will be found by ADL, and since it's no more specific than std::size, the call will be ambiguous."	Feature Requests	assigned	To Be Determined	range	Boost 1.60.0	Problem