Fix linter warnings

docs/lmdb-d-demo/source/main.d

-/** lmdb bining test executable
- * @file
- */
+/* lmdb bining test executable */
 import core.stdc.string;
 
 import std.bitmanip;
@@ -183,7 +181,7 @@ free_mdb_env:
 void lmdb_toy2(const string[] args)
 {
 	int rc;
-	bool verbose = args.length >= 2 && args[1] == "-v" ? true : false;
+	const bool verbose = args.length >= 2 && args[1] == "-v" ? true : false;
 
 	/* Note: Most error checking omitted for simplicity */
 
@@ -235,20 +233,21 @@ void lmdb_toy2(const string[] args)
 
 /* ------------------------------------------------------------------------- */
 
-
-struct myDataTable {
-	uint  field0;
-	uint  field1;
-	uint  field2;
-	uint  field3;
-	char[10] field4;
-	float field5;
+/** Some data structure */
+struct MyDataTable {
+	uint  field0; ///< Some filed...
+	uint  field1; ///<
+	uint  field2; ///<
+	uint  field3; ///<
+	char[10] field4; ///<
+	float field5; ///<
 }
 
+/** Some test code */
 void lmdb_toy3(const string[] args)
 {
 	int rc;
-	bool verbose = args.length >= 2 && args[1] == "-v" ? true : false;
+	const bool verbose = args.length >= 2 && args[1] == "-v" ? true : false;
 
 	/* Note: Most error checking omitted for simplicity */
 
@@ -263,7 +262,7 @@ void lmdb_toy3(const string[] args)
 	foreach (uint i; 0 .. 5)
 	{
 		ubyte[4] kval ; kval[0..4].write!uint(i, 0);
-		myDataTable table = { 42, 23, 17, i, };
+		MyDataTable table = { 42, 23, 17, i, };
 		table.field4[].sformat("Idx=%d\0", table.field3);
 		table.field5 = 3.14 * i;
 		key = new MdbVal(cast(void*)kval, kval.length);
@@ -328,12 +327,14 @@ void lmdb_toy2_iterate_readwrite(MdbEnv env, MdbTxn txn, MdbDbi dbi, MdbCursor c
 }
 
 /** Iterate through all nodes in RO mode, execute a delegate for each node.
- * @param env Reference to MdbEnv class
- * @param tcn Reference to MdbTxn class
- * @param cursor Reference to MdbCursor class
- * @param fkt Delegate with reference to an MdbVal object. Returns bool=false to bereak loop.
+ * Params:
+ *    env = Reference to MdbEnv class
+ *    tcn = Reference to MdbTxn class
+ *    cursor = Reference to MdbCursor class
+ *    fkt = Delegate with reference to an MdbVal object. Returns bool=false to bereak loop.
  */
-void lmdb_iterate_readonly_job(MdbEnv env, MdbTxn txn, MdbDbi dbi, MdbCursor cursor, bool delegate (MdbVal) fkt, bool verbose = true)
+void lmdb_iterate_readonly_job(MdbEnv env, MdbTxn txn, MdbDbi dbi, MdbCursor cursor, 
+	bool delegate (MdbVal) fkt, bool verbose = true)
 {
 	int itemcount; bool fkt_rc;
 	MdbVal key = new MdbVal(), data = new MdbVal();

source/lmdb.d

@@ -257,13 +257,13 @@ struct MDB_val {
 
     /** Constructor to setup structure from a string. */
     this(const string data) nothrow {
-        import std.string;
+        import std.string : toStringz;
         this(toStringz(data), data.length+1);
     }
 
     /** Constructor to setup structure from a C string. */
     this(const char* data) nothrow {
-        import core.stdc.string;
+        import core.stdc.string : strlen;
         this(data, strlen(data)+1);
     }
 
@@ -302,19 +302,19 @@ struct MDB_val {
     }
 
     /** Returns a typed pointer to the embedded struct */
-    T* data(T)() nothrow {
+    T* data(T)() const nothrow {
         return cast(T*)(mv_data);
     }
 
     /** Assigns new structure values from a const string. */
     ref MDB_val assign(const ref string data) nothrow {
-        import std.string;
+        import std.string : toStringz;
         return assign(toStringz(data), data.sizeof);
     }
 
     /** Assigns new structure values from a const C-string. */
     ref MDB_val assign(const char* data) nothrow {
-        import core.stdc.string;
+        import core.stdc.string : strlen;
         return assign(data, strlen(data)+1);
     }
 

source/lmdb_oo.d

@@ -739,8 +739,8 @@ public:
     }
 
 	/** Print it some useful way... */
-	override string toString() {
-		import std.format;
+	override string toString() const {
+		import std.format : format;
 		return format("%x @ %d %s", _val.data!(ubyte*)(), _val.size(), _val.data!ubyte()[0.._val.size()]);
 	}
 }
@@ -1053,14 +1053,16 @@ public:
         mdb_dbi_open(txn, name, flags, &handle);
         return new MdbDbi(handle);
     }
+    /** Close a database handle
+    * Param: 
+    *   env = an MdbEnv
+    */
     void close(MdbEnv env) {
         mdb_dbi_close(env.handle(), _handle);
     }
 
-    /**
-   * Constructor.
-   *
-   * @param handle a valid `MDB_dbi` handle
+    /** Constructor.
+   * Param:  handle = a valid `MDB_dbi` handle
    */
     this(const MDB_dbi handle) nothrow {
         _handle = handle;