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[Jarr10]

Why doesn't C++ allow the passing of complex, compound and compound/complex data types by value?

[Moschops]

It does. Perhaps you're doing it incorrectly.

[king214]

By complex do you mean this?

http://cplusplus.com/reference/std/complex/

Why doesn't C++ allow the passing of complex, compound and compound/complex data types by value?

Do you mean a class? Your compiler "should" write a copy constructor for you, assuming you didn't already write one (or make it private).