Signals are now not only typesafe, but also will throw an exception if you try

to construct a slot with a null pointer, or call a signal that has not been set
yet.  Also, signals can be checked for being set, and assigned to one another.

1 files changed, 75 insertions, 0 deletions

diff --git a/src/signals.h b/src/signals.h
index 722f928..3f892b8 100644
--- a/src/signals.h
+++ b/src/signals.h
@@ -2,9 +2,11 @@
 #define BU_OBJECT_SIGNALS_H
 
 #include "bu/util.h"
+#include "bu/exceptionbase.h"
 
 namespace Bu
 {
+        subExceptionDecl( SignalException );
         //
         // 0 Parameters
         //
@@ -31,6 +33,7 @@ namespace Bu
 
                 virtual ret operator()()
                 {
+
                         return (pCls->*pFnc)();
                 }
                 
@@ -79,9 +82,19 @@ namespace Bu
 
                 ret operator()()
                 {
+                        if( !pCb ) throw SignalException("Uninitialized signal used.");
                         return (*pCb)();
                 }
 
+                bool isSet() const { return pCb != NULL; }
+                operator bool() const { return isSet(); }
+                
+                Signal0 &operator=( const Signal0 &rhs )
+                {
+                        pCb = rhs.pCb->clone();
+                        return *this;
+                }
+
         private:
                 _Slot0<ret> *pCb;
         };
@@ -89,6 +102,7 @@ namespace Bu
         template<typename cls, typename ret>
         Signal0<ret> slot( cls *pCls, ret (cls::*pFnc)() )
         {
+                if( !pCls || !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal0<ret>(
                         new __Slot0<cls, ret>( pCls, pFnc )
                         );
@@ -97,6 +111,7 @@ namespace Bu
         template<typename ret>
         Signal0<ret> slot( ret (*pFnc)() )
         {
+                if( !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal0<ret>(
                         new __Slot0F<ret>( pFnc )
                         );
@@ -176,9 +191,19 @@ namespace Bu
 
                 ret operator()( p1t p1 )
                 {
+                        if( !pCb ) throw SignalException("Uninitialized signal used.");
                         return (*pCb)( p1 );
                 }
 
+                bool isSet() const { return pCb != NULL; }
+                operator bool() const { return isSet(); }
+                
+                Signal1 &operator=( const Signal1 &rhs )
+                {
+                        pCb = rhs.pCb->clone();
+                        return *this;
+                }
+
         private:
                 _Slot1<ret, p1t> *pCb;
         };
@@ -186,6 +211,7 @@ namespace Bu
         template<typename cls, typename ret, typename p1t>
         Signal1<ret, p1t> slot( cls *pCls, ret (cls::*pFnc)( p1t ) )
         {
+                if( !pCls || !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal1<ret, p1t>(
                         new __Slot1<cls, ret, p1t>( pCls, pFnc )
                         );
@@ -194,6 +220,7 @@ namespace Bu
         template<typename ret, typename p1t>
         Signal1<ret, p1t> slot( ret (*pFnc)( p1t ) )
         {
+                if( !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal1<ret, p1t>(
                         new __Slot1F<ret, p1t>( pFnc )
                         );
@@ -273,9 +300,19 @@ namespace Bu
 
                 ret operator()( p1t p1, p2t p2 )
                 {
+                        if( !pCb ) throw SignalException("Uninitialized signal used.");
                         return (*pCb)( p1, p2 );
                 }
 
+                bool isSet() const { return pCb != NULL; }
+                operator bool() const { return isSet(); }
+                
+                Signal2 &operator=( const Signal2 &rhs )
+                {
+                        pCb = rhs.pCb->clone();
+                        return *this;
+                }
+
         private:
                 _Slot2<ret, p1t, p2t> *pCb;
         };
@@ -283,6 +320,7 @@ namespace Bu
         template<typename cls, typename ret, typename p1t, typename p2t>
         Signal2<ret, p1t, p2t> slot( cls *pCls, ret (cls::*pFnc)( p1t, p2t ) )
         {
+                if( !pCls || !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal2<ret, p1t, p2t>(
                         new __Slot2<cls, ret, p1t, p2t>( pCls, pFnc )
                         );
@@ -291,6 +329,7 @@ namespace Bu
         template<typename ret, typename p1t, typename p2t>
         Signal2<ret, p1t, p2t> slot( ret (*pFnc)( p1t, p2t ) )
         {
+                if( !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal2<ret, p1t, p2t>(
                         new __Slot2F<ret, p1t, p2t>( pFnc )
                         );
@@ -370,9 +409,19 @@ namespace Bu
 
                 ret operator()( p1t p1, p2t p2, p3t p3 )
                 {
+                        if( !pCb ) throw SignalException("Uninitialized signal used.");
                         return (*pCb)( p1, p2, p3 );
                 }
 
+                bool isSet() const { return pCb != NULL; }
+                operator bool() const { return isSet(); }
+                
+                Signal3 &operator=( const Signal3 &rhs )
+                {
+                        pCb = rhs.pCb->clone();
+                        return *this;
+                }
+
         private:
                 _Slot3<ret, p1t, p2t, p3t> *pCb;
         };
@@ -380,6 +429,7 @@ namespace Bu
         template<typename cls, typename ret, typename p1t, typename p2t, typename p3t>
         Signal3<ret, p1t, p2t, p3t> slot( cls *pCls, ret (cls::*pFnc)( p1t, p2t, p3t ) )
         {
+                if( !pCls || !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal3<ret, p1t, p2t, p3t>(
                         new __Slot3<cls, ret, p1t, p2t, p3t>( pCls, pFnc )
                         );
@@ -388,6 +438,7 @@ namespace Bu
         template<typename ret, typename p1t, typename p2t, typename p3t>
         Signal3<ret, p1t, p2t, p3t> slot( ret (*pFnc)( p1t, p2t, p3t ) )
         {
+                if( !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal3<ret, p1t, p2t, p3t>(
                         new __Slot3F<ret, p1t, p2t, p3t>( pFnc )
                         );
@@ -467,9 +518,19 @@ namespace Bu
 
                 ret operator()( p1t p1, p2t p2, p3t p3, p4t p4 )
                 {
+                        if( !pCb ) throw SignalException("Uninitialized signal used.");
                         return (*pCb)( p1, p2, p3, p4 );
                 }
 
+                bool isSet() const { return pCb != NULL; }
+                operator bool() const { return isSet(); }
+                
+                Signal4 &operator=( const Signal4 &rhs )
+                {
+                        pCb = rhs.pCb->clone();
+                        return *this;
+                }
+
         private:
                 _Slot4<ret, p1t, p2t, p3t, p4t> *pCb;
         };
@@ -477,6 +538,7 @@ namespace Bu
         template<typename cls, typename ret, typename p1t, typename p2t, typename p3t, typename p4t>
         Signal4<ret, p1t, p2t, p3t, p4t> slot( cls *pCls, ret (cls::*pFnc)( p1t, p2t, p3t, p4t ) )
         {
+                if( !pCls || !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal4<ret, p1t, p2t, p3t, p4t>(
                         new __Slot4<cls, ret, p1t, p2t, p3t, p4t>( pCls, pFnc )
                         );
@@ -485,6 +547,7 @@ namespace Bu
         template<typename ret, typename p1t, typename p2t, typename p3t, typename p4t>
         Signal4<ret, p1t, p2t, p3t, p4t> slot( ret (*pFnc)( p1t, p2t, p3t, p4t ) )
         {
+                if( !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal4<ret, p1t, p2t, p3t, p4t>(
                         new __Slot4F<ret, p1t, p2t, p3t, p4t>( pFnc )
                         );
@@ -564,9 +627,19 @@ namespace Bu
 
                 ret operator()( p1t p1, p2t p2, p3t p3, p4t p4, p5t p5 )
                 {
+                        if( !pCb ) throw SignalException("Uninitialized signal used.");
                         return (*pCb)( p1, p2, p3, p4, p5 );
                 }
 
+                bool isSet() const { return pCb != NULL; }
+                operator bool() const { return isSet(); }
+                
+                Signal5 &operator=( const Signal5 &rhs )
+                {
+                        pCb = rhs.pCb->clone();
+                        return *this;
+                }
+
         private:
                 _Slot5<ret, p1t, p2t, p3t, p4t, p5t> *pCb;
         };
@@ -574,6 +647,7 @@ namespace Bu
         template<typename cls, typename ret, typename p1t, typename p2t, typename p3t, typename p4t, typename p5t>
         Signal5<ret, p1t, p2t, p3t, p4t, p5t> slot( cls *pCls, ret (cls::*pFnc)( p1t, p2t, p3t, p4t, p5t ) )
         {
+                if( !pCls || !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal5<ret, p1t, p2t, p3t, p4t, p5t>(
                         new __Slot5<cls, ret, p1t, p2t, p3t, p4t, p5t>( pCls, pFnc )
                         );
@@ -582,6 +656,7 @@ namespace Bu
         template<typename ret, typename p1t, typename p2t, typename p3t, typename p4t, typename p5t>
         Signal5<ret, p1t, p2t, p3t, p4t, p5t> slot( ret (*pFnc)( p1t, p2t, p3t, p4t, p5t ) )
         {
+                if( !pFnc ) throw SignalException("NULL pointer in slot().");
                 return Signal5<ret, p1t, p2t, p3t, p4t, p5t>(
                         new __Slot5F<ret, p1t, p2t, p3t, p4t, p5t>( pFnc )
                         );