* Changed Bus operator[]() parameter from unsigned int to int to match mbed code

guidelines.
* Uncommented assertions in operators and added check for operator[] index < 0.
* Moved one operator from private to public, this was a typo thing.

libraries/mbed/api/BusIn.h

@@ -77,7 +77,7 @@ public:
 
     /** Access to particular bit in random-iterator fashion
      */
-    DigitalIn & operator[] (unsigned int index);
+    DigitalIn & operator[] (int index);
 #endif
 
 protected:

libraries/mbed/api/BusInOut.h

@@ -90,6 +90,10 @@ public:
     BusInOut& operator= (int v);
     BusInOut& operator= (BusInOut& rhs);
 
+    /** Access to particular bit in random-iterator fashion
+    */
+    DigitalInOut& operator[] (int index);
+
     /** A shorthand for read()
      */
     operator int();
@@ -108,7 +112,6 @@ protected:
 private:
     BusInOut(const BusInOut&);
     BusInOut & operator = (const BusInOut&);
-    DigitalInOut& operator[] (unsigned int index);
 };
 
 } // namespace mbed

libraries/mbed/api/BusOut.h

@@ -76,7 +76,7 @@ public:
 
     /** Access to particular bit in random-iterator fashion
      */
-    DigitalOut& operator[] (unsigned int index);
+    DigitalOut& operator[] (int index);
 
     /** A shorthand for read()
      */

libraries/mbed/common/BusIn.cpp

@@ -72,9 +72,9 @@ BusIn::operator int() {
     return read();
 }
 
-DigitalIn& BusIn::operator[] (unsigned int index) {
-    //MBED_ASSERT(index >= MBED_BUS_SIZE);
-    //MBED_ASSERT(_pin[index]);
+DigitalIn& BusIn::operator[] (int index) {
+    MBED_ASSERT(index < 0 || index >= MBED_BUS_SIZE);
+    MBED_ASSERT(_pin[index]);
     if (index >= 16 || _pin[index] == NULL) {
         return din_dummy;
     }

libraries/mbed/common/BusInOut.cpp

@@ -102,9 +102,9 @@ BusInOut& BusInOut::operator= (BusInOut& rhs) {
     return *this;
 }
 
-DigitalInOut& BusInOut::operator[] (unsigned int index) {
-    //MBED_ASSERT(index >= MBED_BUS_SIZE);
-    //MBED_ASSERT(_pin[index]);
+DigitalInOut& BusInOut::operator[] (int index) {
+    MBED_ASSERT(index < 0 || index >= MBED_BUS_SIZE);
+    MBED_ASSERT(_pin[index]);
     if (index >= 16 || _pin[index] == NULL) {
         return dinout_dummy;
     }

libraries/mbed/common/BusOut.cpp

@@ -78,9 +78,9 @@ BusOut& BusOut::operator= (BusOut& rhs) {
     return *this;
 }
 
-DigitalOut& BusOut::operator[] (unsigned int index) {
-    //MBED_ASSERT(index >= MBED_BUS_SIZE);
-    //MBED_ASSERT(_pin[index]);
+DigitalOut& BusOut::operator[] (int index) {
+    MBED_ASSERT(index < 0 || index >= MBED_BUS_SIZE);
+    MBED_ASSERT(_pin[index]);
     if (index >= 16 || _pin[index] == NULL) {
         return dout_dummy;
     }