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In terms of efficiency, they are basically the same on C++, but don't know how MQL handles them.
I just prefer using structures for simplicity because it assumes public access.
i see tx
ok think my working model for this problem is around high perf code i will just always start my types as structs.
With the design ready to adapt if later i need to change it to class.
i do the same for class variable scope, i like simple rules that i can switch off brain and just code, i always start class variables as private, then change to protected, public as required.
then i dont have to think about it, as am listening to thriller audio book on YouTube whilst coding and trading.