I am using g++ 5.1.0 to compile the following C++14 program test.cpp:
#include <memory>
class Factor {
public:
Factor(const Factor&) = default;
Factor(Factor&&) = default;
Factor& operator=(const Factor&) = default;
Factor& operator=(Factor&&) = default;
Factor(int data) {
_data = std::make_unique<int>(data);
}
int* data() const { return _data.get(); }
private:
std::unique_ptr<int> _data;
};
class Node {
public:
Node(const Node& other) : _factor(other._factor) {
}
private:
Factor _factor;
};
int main(int argc, char **argv) {
}
When I try to compile I get the following errors:
test.cpp: In copy constructor ‘Node::Node(const Node&)’:
test.cpp:19:52: error: use of deleted function ‘Factor::Factor(const Factor&)’
Node(const Node& other) : _factor(other._factor) {
^
test.cpp:5:5: note: ‘Factor::Factor(const Factor&)’ is implicitly deleted because the default definition would be ill-formed:
Factor(const Factor&) = default;
^
test.cpp:5:5: error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = int; _Dp = std::default_delete<int>]’
In file included from /usr/include/c++/5/memory:81:0,
from test.cpp:1:
/usr/include/c++/5/bits/unique_ptr.h:356:7: note: declared here
unique_ptr(const unique_ptr&) = delete;
^
I don't know where to begin diagnosing this issue because it seems fairly obvious to me that the copy constructor exists and is not deleted. What could be the cause of this?