Subscript operators
Declared in <ball_categorymanager.h>
Return a non-const reference to the category at the specified index in the registry of this category manager. The behavior is undefined unless 0 <= index < length().
Category&
operator[](int index);
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Return a const reference to the category at the specified index in the registry of this category manager. The behavior is undefined unless 0 <= index < length().
Category const&
operator[](int index) const;
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