Question

In c++ do you have ‘out parameters’ like in c#?

In c# the method signature would be:

bool TryGetValue(int key, out OrderType order)

The idea is the variable may not be assigned before passed but MUST be assigned before exiting the method.

MSDN out params link: http://msdn.microsoft.com/en-us/library/aa645764(v=vs.71).aspx

Answer 1

There is nothing as strict as C# out parameters in C++. You can use pointers and references to pass values back but there is no guarantee by the compiler that they are assigned to within the function. They are much closer to C# ref than out

// Compiles just fine in C++
bool TryGetValue(int key, OrderType& order) {
  return false;
}