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I have a reference to some class MyObject, but the exact object depends on a condition. I want to do something like this:

MyObject& ref; 
if([condition]) 
  ref = MyObject([something]);
else 
  ref = MyObject([something else]);

I cannot do this right now because the compiler does not allow me to declare but not initialize a reference. What can I do to achieve my goal here?

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You need to initliaze it. But if you would like to conditionally initialize it, you can do something like this:

MyObject& ref = (condition) ? MyObject([something]) : MyObject([something else]);

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