Метод оператора []
- int index
Целое число в address + sizeOf<T>() * index.
Реализация
external int operator [](int index);
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Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-ffi/AbiSpecificIntegerPointer/operator_get.html
