Subscript operators
Declared in <ball_userfields.h>
Return a reference providing modifiable access to the value at the specified index. The behavior is undefined unless 0 <= index && index < length().
UserFieldValue&
operator[](int index);
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Return a reference providing non-modifiable access to the value at the specified index. The behavior is undefined unless 0 <= index && index < length().
UserFieldValue const&
operator[](int index) const;
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