How do I define size of C++ Vector in a Parameterised Constructor

Question

This question already has answers here: question from:https://stackoverflow.com/questions/65912564/how-do-i-define-size-of-c-vector-in-a-parameterised-constructor

Answer 1

You need to use a member initializer list:

OrderedStream(int n)
    : vec(n)  // <- A list of initializers for (non-static) members
{
    // Empty
}

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On another note, unless you expect negative sizes, I recommend that you use size_t for sizes.