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The
subscript operator should be overloaded as a
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member;
the first operand must be an object of the class
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To
be consistent, the second operand should be an integer
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index.
Passed by value as it isn’t changed by the operator.
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Since
the first operand is not modified (i.e., the current
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object
is not modified), it should be specified as a
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constant
member -- although exceptions are common.
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The
residual value should be the data type of the
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“element”
of the “array” being indexed, by reference.
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The
residual value is an lvalue -- not an rvalue!
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