container: const correctness

src/entt/container/dense_map.hpp

@@ -83,7 +83,7 @@ public:
     }
 
     constexpr dense_map_iterator operator++(int) noexcept {
-        dense_map_iterator orig = *this;
+        const dense_map_iterator orig = *this;
         return ++(*this), orig;
     }
 
@@ -92,7 +92,7 @@ public:
     }
 
     constexpr dense_map_iterator operator--(int) noexcept {
-        dense_map_iterator orig = *this;
+        const dense_map_iterator orig = *this;
         return operator--(), orig;
     }
 
@@ -208,7 +208,7 @@ public:
     }
 
     constexpr dense_map_local_iterator operator++(int) noexcept {
-        dense_map_local_iterator orig = *this;
+        const dense_map_local_iterator orig = *this;
         return ++(*this), orig;
     }
 

src/entt/container/dense_set.hpp

@@ -49,7 +49,7 @@ public:
     }
 
     constexpr dense_set_iterator operator++(int) noexcept {
-        dense_set_iterator orig = *this;
+        const dense_set_iterator orig = *this;
         return ++(*this), orig;
     }
 
@@ -58,7 +58,7 @@ public:
     }
 
     constexpr dense_set_iterator operator--(int) noexcept {
-        dense_set_iterator orig = *this;
+        const dense_set_iterator orig = *this;
         return operator--(), orig;
     }
 
@@ -170,7 +170,7 @@ public:
     }
 
     constexpr dense_set_local_iterator operator++(int) noexcept {
-        dense_set_local_iterator orig = *this;
+        const dense_set_local_iterator orig = *this;
         return ++(*this), orig;
     }
 

src/entt/container/table.hpp

@@ -43,7 +43,7 @@ public:
     }
 
     constexpr table_iterator operator++(int) noexcept {
-        table_iterator orig = *this;
+        const table_iterator orig = *this;
         return ++(*this), orig;
     }
 
@@ -52,7 +52,7 @@ public:
     }
 
     constexpr table_iterator operator--(int) noexcept {
-        table_iterator orig = *this;
+        const table_iterator orig = *this;
         return operator--(), orig;
     }