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This method is guaranteed to preserve the current data in the buffer. If you need only to write to the buffer, use the Write method. Use this method when you need read and write access to the data for writing. If you just need to read the data, use Read instead! Read is faster, as Modify may result in additional memory allocation and copy operations if the internal data buffer is shared. Write is faster than the Modify method, as it will not perform any copies of the existing data.
var RawData : PReal; RawData := RealBuffer.Modify();