Stop r-value invoking move assignment C++ 11

Question

Consider a simple C++ class that I do not want to modify:

class foo {};

Then if I do the following I will invoke the move assignment operator:

foo f{};

f = foo{};

Is there a way to invoke copy assignment without modifying foo or using an intermediate g like this:

foo f{};
foo g{};
f = g;

Almost as if there were std::dont_move!

Answer 1

std::dont_move() is easy to implement by yourself:

template <typename T>
const T& force_copy(T&& v)
{
    return v;
}

See usage example

Answer 2

You can write:

f = static_cast<foo const&>(foo{});