Question

I am not sure why this doesn’t compile:

std::vector< const Obj& > myVector;

void foo(const Obj& obj) 
{
    myVector.push_back( obj );  
}  

Sorry, a bit of additional info on what I’m trying to achieve: I can’t change the signature of foo without breaking an interface, but I just want to hang onto the Objects that get passed through foo. I do want to store pointers to them, but I’m confused about the syntax of how to do that.

Answer 1

You can’t have an vector of references. as the things in a vector must be copyable and assignable, and references are neither of these. You probably want a vector of pointers:

std::vector< const Obj * > myVector;

void foo( const Obj & obj )
{
   myVector.push_back( & obj );
}