Greets, I'm trying to use the boost::any component but i'm having problem with it !!! I'm using it because I need a way to store parameters of different type. That real fine but I can't retrieve the value from the boost::any. This is what i've tried : std::string GetStringFromAny(const boost::any& val) const { std::string strVal; try { strVal = boost::any_caststd::string(val); } catch(boost::bad_any_cast &err) { std::cerr << err.what() << std::endl; return ""; } return strVal; } But I always have a bad_any_cast exception. From the documentation, at leats what I understand of it, "If passed a value or reference, it returns a copy of the value content if successful". Can someone point me in the right direction as to how can I extract the value within a boost::any type, I think i'm lost !!! :) Thanks in advance for any help. Luc.
On Friday 11 October 2002 09:05 am, Luc Bergeron wrote:
std::string GetStringFromAny(const boost::any& val) const { std::string strVal; try { strVal = boost::any_caststd::string(val); } catch(boost::bad_any_cast &err) { std::cerr << err.what() << std::endl; return ""; } return strVal; }
But I always have a bad_any_cast exception. From the documentation, at leats what I understand of it, "If passed a value or reference, it returns a copy of the value content if successful". Can someone point me in the right direction as to how can I extract the value within a boost::any type, I think i'm lost !!! :)
This code is correct AFAICT. Are you sure that the boost::any actually has a std::string in it? It's a very common mistake to try to test a routine like this with: GetStringFromAny("foo") The type of "foo" is const char*, not std::string. Doug
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Douglas Gregor -
Luc Bergeron