OpenSSL::PKey::EC::Group#initialize_copy

static VALUE
ossl_ec_group_initialize_copy(VALUE self, VALUE other)
{
    EC_GROUP *group, *group_new;

    TypedData_Get_Struct(self, EC_GROUP, &ossl_ec_group_type, group_new);
    if (group_new)
        ossl_raise(eEC_GROUP, "EC::Group already initialized");
    GetECGroup(other, group);

    group_new = EC_GROUP_dup(group);
    if (!group_new)
        ossl_raise(eEC_GROUP, "EC_GROUP_dup");
    RTYPEDDATA_DATA(self) = group_new;

    return self;
}