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Gnuradio supports most primitive datatypes in C++, as well as complex and vector types grouping them together. The types used in the companion app are enumerated in grc/core/ in the sourcetree.

The Complex data type generates 8 bytes for each complex data item; where the first 4 bytes are for the real number and the next 4 bytes are for the imaginary number. Both the real and the imaginary values are 4-byte floating point numbers.
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