Why not a generic default validator?
BTW, I know "typeid (T).name()" doesn't really work, but I'm not sure what
would be better.
If not totally generic, then instead at least all fundamental types could be
handled by a single generic function, using maybe is_pod to dispatch.
namespace boost { namespace program_options {
template<typename T>
void validator<T>::operator()(any& v, const vector<string>& xs)
{
check_first_occurence(v);
string s(get_single_string(xs));
try {
v = any(lexical_cast<T>(s));
}
catch(bad_lexical_cast&) {
throw validation_error("'" + s + "' doesn't look like a " + typeid
(T).name());
}
}
} }
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