Use Constant References For Input-Only Parameters, Pointers Otherwise

This is a style issue, so there is no right or wrong, but I suggest using a const reference for an input-only paramater to a C++ function and a pointer for an input/output or output-only parameter. This makes it slightly more obvious that the parameter might be modified by the function.

Example:

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ReturnType Function
    (
    const ParamType& inputParam,
    ParamType* inputOutputParam,
    ParamType* outputParam
    )
{
    // ...
}

void User()
{
    ParamType inputParam;
    ParamType inputOutputParam;
    ParamType outputParam;

    // Note the &s -- this is a bit of a warning something
    // might happen to inputOutputParam or outputParam...
    ReturnType ret = Function
        (
        inputParam,
        &inputOutputParam,
        &outputParam
        );
}