Question

How can I check if an element of a multimap exists?
With this code:

typedef std::multimap<std::string, std::string> TagVal;
TagVal tv;
//... add values to tv ...
TagVal::const_iterator it = tv.find("abc");
if(it == TagVal::end())    // <--- ERROR
    cerr << "Error";

I get the following compile time error:

error: cannot call member function ‘std::multimap<…>::iterator std::multimap<…>::end() …
without object.

Platform: Linux, GCC 4.5.1

Answer 1

The reason is that end is not a static method, it has to be called on the object you got the iterator from:

if(it == tv.end())
    cerr << "Error";