Improve error message for failed casts

refs #6070

diff --git a/lib/base/value-operators.cpp b/lib/base/value-operators.cpp
index a352717579844316dd9545262dc6a2ba6953bde8..3c5e8d989734350ef61d5548c137c784263eb690 100644 (file)
--- a/lib/base/value-operators.cpp
+++ b/lib/base/value-operators.cpp
@@ -42,7 +42,13 @@ Value::operator double(void) const
        if (IsEmpty())
                return 0;
 
-       return boost::lexical_cast<double>(m_Value);
+       try {
+               return boost::lexical_cast<double>(m_Value);
+       } catch (const std::exception&) {
+               std::ostringstream msgbuf;
+               msgbuf << "Can't convert '" << *this << "' to a floating point number.";
+               BOOST_THROW_EXCEPTION(std::invalid_argument(msgbuf.str()));
+       }
 }
 
 Value::operator String(void) const