[Bug c++/107022] error: use of deleted function 'std::unordered_map

[piersh at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107022

--- Comment #4 from piersh at hotmail dot com ---
is it related to nested classes? this reproduces the issue: uncomment line 9 to
repro:


#include <unordered_map>
#include <memory>

struct key {};

struct my_hash
{
    my_hash() {}
    //my_hash(int i = 42) {}  // <<-- uncomment for bug
    std::size_t operator()(const key &ep) const { return 0; }
};

struct foo
{
    foo();
private:
    std::unordered_map<key, int, my_hash> things_;
};

foo::foo() {}