Modernize src/c* src/d* and src/e* files (#6263)

* Modernize src/c* src/d* and src/e* files

* default operator
* redundant init
* delete default constructors on CraftDefinition childs (never used)
* fix some missing init values
* const ref fix reported by clang-tidy
* ranged-based for loops
* simple conditions & returns
* empty stl function instead of size
* emplace_back stl function instead of push_back + construct temp obj
* auto for some iterators
* code style fixes
* c++ stl headers instead of C stl headers (stdio.h -> cstdio)

1 files changed, 2 insertions, 2 deletions

diff --git a/src/database-postgresql.h b/src/database-postgresql.h
index 94d651e24..db0b505c9 100644
--- a/src/database-postgresql.h
+++ b/src/database-postgresql.h
@@ -111,7 +111,7 @@ class MapDatabasePostgreSQL : private Database_PostgreSQL, public MapDatabase
 {
 public:
 	MapDatabasePostgreSQL(const std::string &connect_string);
-	virtual ~MapDatabasePostgreSQL() {}
+	virtual ~MapDatabasePostgreSQL() = default;
 
 	bool saveBlock(const v3s16 &pos, const std::string &data);
 	void loadBlock(const v3s16 &pos, std::string *block);
@@ -130,7 +130,7 @@ class PlayerDatabasePostgreSQL : private Database_PostgreSQL, public PlayerDatab
 {
 public:
 	PlayerDatabasePostgreSQL(const std::string &connect_string);
-	virtual ~PlayerDatabasePostgreSQL() {}
+	virtual ~PlayerDatabasePostgreSQL() = default;
 
 	void savePlayer(RemotePlayer *player);
 	bool loadPlayer(RemotePlayer *player, PlayerSAO *sao);