----- "Bernd Prager" <bernd@prager.ws> a écrit :

All,

This is likely to be a silly question. I am trying to check for the existence of a value in a property tree.

Reading the docs I assumed the easiest way would be:

namespace pt = boost::property_tree; static pt::ptree pt;

bool has(const std::string key) { if (pt.find(key) == pt.end()) return false; // (1) return true; }

The compiler complains about "error: no match for 'operator=='" in line (1) though. What am I missing?

For your problem, the two iterators are not of the same type. Don't know the exact reason, but I know that ptree uses multi_index. Might be related. Anyway : - you have a get_optional() method. - you can try replacing end() with not_found() Regards, Ivan