libcore: Conveniently checking if String and Block are empty

doomsday/sdk/libcore/include/de/data/block.h

@@ -81,37 +81,14 @@ class DENG2_PUBLIC Block : public QByteArray, public IByteArray, public IBlock,
      */
     Block(IByteArray const &array, Offset at, Size count);
 
-    // Implements IByteArray.
-    Size size() const;
-    void get(Offset at, Byte *values, Size count) const;
-    void set(Offset at, Byte const *values, Size count);
-
-    // Implements IBlock.
-    void clear();
-    void copyFrom(IByteArray const &array, Offset at, Size count);
-    void resize(Size size);
-    Byte const *data() const;
-
-    // Implements ISerializable.
-    /**
-     * Writes @a block into the destination buffer. Writes the size of the
-     * block in addition to its contents, so a Reader will not need to know
-     * beforehand how large the block is.
-     *
-     * @param block  Block to write.
-     *
-     * @return  Reference to the Writer.
-     */
-    void operator >> (Writer &to) const;
-
-    void operator << (Reader &from);
-
     Byte *data();
     Byte const *dataConst() const;
 
     Block &append(Byte b);
     Block &append(char const *str, int len);
 
+    inline explicit operator bool() const { return !isEmpty(); }
+
     Block &operator += (char const *nullTerminatedCStr);
     Block &operator += (QByteArray const &bytes);
 
@@ -131,6 +108,31 @@ class DENG2_PUBLIC Block : public QByteArray, public IByteArray, public IBlock,
     Block md5Hash() const;
     String asHexadecimalText() const;
 
+    // Implements IByteArray.
+    Size size() const;
+    void get(Offset at, Byte *values, Size count) const;
+    void set(Offset at, Byte const *values, Size count);
+
+    // Implements IBlock.
+    void clear();
+    void copyFrom(IByteArray const &array, Offset at, Size count);
+    void resize(Size size);
+    Byte const *data() const;
+
+    // Implements ISerializable.
+    /**
+     * Writes @a block into the destination buffer. Writes the size of the
+     * block in addition to its contents, so a Reader will not need to know
+     * beforehand how large the block is.
+     *
+     * @param block  Block to write.
+     *
+     * @return  Reference to the Writer.
+     */
+    void operator >> (Writer &to) const;
+
+    void operator << (Reader &from);
+
 public:
     static Block join(QList<Block> const &blocks, Block const &sep = Block());
 };

doomsday/sdk/libcore/include/de/data/string.h

@@ -106,6 +106,8 @@ class DENG2_PUBLIC String : public QString
         return *this;
     }
 
+    inline explicit operator bool() const { return size() > 0; }
+
     /// Conversion to a character pointer.
     operator QChar const *() const {
         return data();