id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
13137	"boost::optional::operator*() doesn't have ""const &&"" overload, allowing incorrect usage"	for.gcc.bugzilla@…	Fernando Cacciola	"{{{
#include <boost/optional.hpp>

const boost::optional<int> f()
{
    return {1};
}

int main()
{
    const int& ref = *f();
    // creates a boost::optional temporary
    // ""*tmp"" binds to ""optional::operator*() const&""
    // ""ref"" starts pointing to internals of the returned temporary
    // temporary gets destroyed
    // we have a dangling reference
}
}}}

at the same time, std::optional in C++17 does have
{{{
constexpr const T&& operator*() const &&;
}}}
[http://en.cppreference.com/w/cpp/utility/optional/operator* overload], which lets the code above work correctly."	Bugs	new	To Be Determined	optional	Boost 1.65.0	Problem