https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108342
--- Comment #3 from Rui Oliveira <ruilvo at ua dot pt> --- (In reply to Andrew Pinski from comment #1) > > I know about _Atomic and std::atomic but not std::complex and _Complex. > Because std::complex was part of C++98 which was done before C99's _Complex > ... [complex.numbers.general] mentions: If z is an lvalue of type cv complex<T> then: the expression reinterpret_cast<cv T(&)[2]>(z) is well-formed, https://eel.is/c++draft/complex.numbers.general Basically stating that std::complex<T> is layouted exactly the same as T[2]. C standard says something similar iirc.
