Detect dangling references to temporary

Question

Clang 3.9 extremely reuses memory used by temporaries.

This code is UB (simplified code):

template 
class my_optional
{
public:
    bo         


        

Answer 1

You could try out lvalue_ref wrapper from Explicit library. It prevents the unwanted binding to a temporary in one declaration, like:

const T& get_or_default(lvalue_ref def)
{
    return has ? value : def.get();
}