Assignment to std::complex number real and imag separately

[nnelson]

The page on Bytes.com 'Assignment to std::complex number' obtains a 'no result for assigning the real and imaginary components separately. This page

http://en.cppreference.com/w/cpp/numeric/complex

toward the bottom gives

"For any object z of type complex<T>, reinterpret_cast<T(&)[2]>(z)[0] is the real part of z and reinterpret_cast<T(&)[2]>(z)[1] is the imaginary part of z."

Separate assignment is then, for double type, complex number z

reinterpret_cast<double(&)[2]>(z)[0] = real_assign_number;
reinterpret_cast<double(&)[2]>(z)[1] = imag_assign_number;

Or:

#define REAL64(a) reinterpret_cast<double(&)[2]>(a)[0]
#define IMAG64(a) reinterpret_cast<double(&)[2]>(a)[1]

REAL64(z) = real_assign_number;
IMAG64(z) = imag_assign_number;

Neil

[weaknessforcats]

There are std::complex methods to call to do all of this. These methods and operator overloads do not use casts or macros.