more robust type cast in I/O functions

lib/File.hpp

@@ -110,6 +110,12 @@ const IoT& File::getData(const std::string &name) const
         LATAN_ERROR(Definition, "no data with name '" + name + "' in file "
                     + name_);
     }
+    catch(std::bad_cast)
+    {
+        LATAN_ERROR(Definition, "data with name '" + name + "' in file "
+                    + name_ + " does not have type '" + typeid(IoT).name()
+                    + "'");
+    }
 }
 
 END_LATAN_NAMESPACE

utils/sample_combine.cpp

@@ -187,7 +187,7 @@ int main(int argc, char *argv[])
     {
         process<DSample>(outFileName, fileName, code);
     }
-    catch (bad_cast &e)
+    catch (Exceptions::Definition)
     {
         process<DMatSample>(outFileName, fileName, code);
     }

utils/sample_read.cpp

@@ -46,7 +46,7 @@ int main(int argc, char *argv[])
             Io::save(s, copy, File::Mode::write, name);
         }
     }
-    catch (bad_cast &e)
+    catch (Exceptions::Definition)
     {
         DSample s    = Io::load<DSample>(fileName);
         string  name = Io::getFirstName(fileName);