Definition: In C++, a reference is a restricted type of pointer. It can only be assigned once and can never have a NULL value.
References are most useful when used to indicate that a parameter to a function is being Passed by Reference where the address of the variable is passed in. Without a Reference, Pass By Value is used instead.
Glossary:
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Passing a large array by value into a function is slow and can possibly exhaust the stack possibly causing a crash. Pass by Reference should be used instead.
