id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
10445,rvalue assign from boost::optional<const T&> doesn't work,russell.mcclellan@…,Fernando Cacciola,"consider the following code:


{{{
#include ""boost/optional.hpp""
#include <iostream>

struct a 
{
    int p;
};

boost::optional<const a&> bar() {
    static a b;
    b.p = 3;
    return b;
}

int main(int, char**)
{
    boost::optional<a> baz;
    baz = bar(); // uh-oh!
    std::cout<<baz->p<<std::endl;
    return 0;
}
}}}

My expectation is that the line marked ""uh-oh"" should compile correctly and invoke a's copy constructor to fill in baz's a.  What actually happens is that I get a compile error saying that I can't static cast from const a& to a&& inside the move assignment operator for optional.
",Bugs,closed,Boost 1.61.0,optional,Boost 1.56.0,Regression,fixed,,