Re: [Design] Should accessors throw exception ?

Hi there,

 I'd like to know if there is a general answer to the following
question: when making a public interface that access a container
should the function throw an exception when the element is not found ?
Otherwise I need two functions: a Find and a Get function which put
the burden on the application programmer to always call Find before
Get.
 The other alternative would be to return some kind of sentinel (like
std::set<>::end() )...

 Comments ?

Thanks
-Mathieu

eg.

#include <map>
#include <string.h>

struct Phone { int P; };
struct Name { const char *N;
 bool operator <(Name const &n) const { return strcmp(N,n.N) < 0; }
};
struct YellowPage
{
 void Insert(Name const &n,Phone const &p)
{ I.insert( std::map<Name,Phone>::value_type(n,p) ); }
 bool Find(Name const & n) { return I.find(n) != I.end(); }
 Phone const &Get(Name const&n) { return I.find(n)->second; }
private:
 std::map<Name,Phone> I;
};