remove a hundred implicit constructors/destructors

src/muz/base/dl_rule.h

@@ -313,7 +313,6 @@ namespace datalog {
         static unsigned get_obj_size(unsigned n) { return sizeof(rule) + n * sizeof(app *); }
 
         rule() : m_ref_cnt(0), m_name(symbol::null) {}
-        ~rule() {}
 
         void deallocate(ast_manager & m);
 

src/muz/rel/dl_base.h

@@ -178,7 +178,7 @@ namespace datalog {
 
         class base_fn {
         public:
-            base_fn() {}
+            base_fn() = default;
             virtual ~base_fn() {}
         private:
             //private and undefined copy constructor and operator= to avoid copying
@@ -219,8 +219,6 @@ namespace datalog {
         */
         class mutator_fn : public base_fn {
         public:
-            ~mutator_fn() override {}
-
             virtual void operator()(base_object & t) = 0;
 
             virtual bool supports_attachment(base_object& other) { return false; }

src/muz/rel/dl_bound_relation.h

@@ -94,7 +94,6 @@ namespace datalog {
     struct uint_set2 {
         uint_set lt;
         uint_set le;
-        uint_set2() {}
         bool operator==(const uint_set2& other) const {
             return other.lt == lt && other.le == le;
         }

src/muz/spacer/spacer_context.h

@@ -235,7 +235,6 @@ class pred_transformer {
     public:
         frames (pred_transformer &pt) : m_pt (pt),
                                         m_size(0), m_sorted (true) {}
-        ~frames() {}
         void simplify_formulas ();
 
         pred_transformer& pt() const {return m_pt;}
@@ -356,7 +355,6 @@ class pred_transformer {
         rule2ptrule m_rules;
         tag2ptrule m_tags;
     public:
-        pt_rules() {}
         ~pt_rules() {for (auto &kv : m_rules) {dealloc(kv.m_value);}}
 
         bool find_by_rule(const datalog::rule &r, pt_rule* &ptr) {
@@ -439,7 +437,6 @@ class pred_transformer {
 
 public:
     pred_transformer(context& ctx, manager& pm, func_decl* head);
-    ~pred_transformer() {}
 
     inline bool use_native_mbp ();
     bool mk_mdl_rf_consistent(const datalog::rule *r, model &mdl);
@@ -825,7 +822,6 @@ class pob_queue {
 
 public:
     pob_queue(): m_root(nullptr), m_max_level(0), m_min_depth(0) {}
-    ~pob_queue() {}
 
     void reset();
     pob* top();