c++ “no matching function for call to” error with structure

Question

I have C++ code that maps GUID(unsigned long) to structure.

#include 
#include 

Answer 1

The problem is that when you say:

 pluginDB[1]

you try to create an entry in the map (because [1] does not exist) and to do that as Jason points out, you need a default constructor. However, this is NOT a general requirement of standard library containers, only of std::map, and only of operator[] for std::map (and multimap etc.), which is a good reason why IMHO operator[] for maps et al should be done away with - it is far too confusing for new C++ programmers, and useless for experienced ones.