Error: cannot bind non-const lvalue reference of type ‘int&’ to an rvalue of type ‘int’

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A non-const reference parameter, such as an int&, can only refer to an “lvalue,” which is a named variable.

auto takes_nonconst_reference = [](int&){};
auto takes_const_reference = [](const int&){};
auto takes_value = [](int){};
auto returns_int = []{return 42;};

int foo = 1;

// OK
takes_nonconst_reference(foo);
takes_const_reference(foo);
takes_const_reference(returns_int());
takes_value(foo);
takes_value(returns_int());

// compilation error, value returned from a function is not a named variable
takes_nonconst_reference(returns_int());

In this particular case, since your class is storing a copy of the constructor parameter, you should pass it by value (int, not int& nor const int&).

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