Make ExceptionAbstract derive from std::exception.

     * include/dynamic-graph/exception-abstract.h,
     * include/dynamic-graph/exception-factory.h,
     * include/dynamic-graph/exception-signal.h,
     * include/dynamic-graph/exception-traces.h,
     * include/dynamic-graph/signal-caster.h: This enables uses to catch
       a broader class of exceptions with messages using what() method.

include/dynamic-graph/exception-abstract.h

@@ -43,7 +43,7 @@ namespace dynamicgraph {
 
 /* \class ExceptionAbstract
  */
-class DYNAMICGRAPH_EXPORT ExceptionAbstract
+class DYNAMICGRAPH_EXPORT ExceptionAbstract : public std::exception
 {
 
  public:
@@ -74,7 +74,7 @@ private:
 public:
 
   ExceptionAbstract( const int& code, const std::string & msg = "" );
-  virtual ~ExceptionAbstract( void ){}
+  virtual ~ExceptionAbstract( void ) throw() {}
 
   /**  Access to the error code. */
   int getCode (void);
@@ -87,6 +87,10 @@ public:
    */
   const char *getMessage (void);
 
+  virtual const char* what() const throw()
+  {
+    return getStringMessage().c_str();
+  }
   
   /** Print the error structure. */
   DYNAMICGRAPH_EXPORT friend std::ostream & operator << (std::ostream & os,

include/dynamic-graph/exception-factory.h

@@ -64,7 +64,7 @@ public:
 			const std::string & msg = "" );
   ExceptionFactory ( const ExceptionFactory::ErrorCodeEnum& errcode,
 			const std::string & msg,const char* format, ... );
-  virtual ~ExceptionFactory( void ){}
+  virtual ~ExceptionFactory( void ) throw() {}
 
 };
 

include/dynamic-graph/exception-signal.h

@@ -63,7 +63,7 @@ public:
 		       const std::string & msg = "" );
   ExceptionSignal( const ExceptionSignal::ErrorCodeEnum& errcode,
 			const std::string & msg,const char* format, ... );
-  virtual ~ExceptionSignal( void ){}
+  virtual ~ExceptionSignal( void ) throw() {}
 
 
 };

include/dynamic-graph/exception-traces.h

@@ -58,7 +58,7 @@ public:
 		       const std::string & msg = "" );
   ExceptionTraces( const ExceptionTraces::ErrorCodeEnum& errcode,
 			const std::string & msg,const char* format, ... );
-  virtual ~ExceptionTraces( void ){}
+  virtual ~ExceptionTraces( void ) throw () {}
 
 
 };

include/dynamic-graph/signal-caster.h

@@ -17,6 +17,7 @@
 #include <iostream>
 
 #include <dynamic-graph/dynamic-graph-api.h>
+#include "dynamic-graph/exception-signal.h"
 
 namespace dynamicgraph {
 
@@ -101,7 +102,14 @@ template<typename T> void signal_disp(const T& value, std::ostream& os)
 	{ g_caster.disp(value, os); }
 
 template<typename T> T signal_cast(std::istringstream& iss)
-	{ return boost::any_cast<T>(g_caster.cast(typeid(T), iss)); }
+	{ 
+	  try {
+	    return boost::any_cast<T>(g_caster.cast(typeid(T), iss));
+	  } catch (...) {
+	    throw ExceptionSignal(ExceptionSignal::GENERIC,
+				  "Exception boost::any_cast");
+	  }
+	}
 
 template<typename T> void signal_trace(const T& value, std::ostream& os)
 	{ g_caster.trace(value, os); }