#ifdef _MSC_VER
#if !defined(__cplusplus) || _MSVC_LANG <= 201402L
#include <complex.h>
typedef _Fcomplex GoComplex64;
typedef _Dcomplex GoComplex128;
#else
#include <complex>
typedef std::complex<float> GoComplex64;
typedef std::complex<double> GoComplex128;
#endif
#else
typedef float _Complex GoComplex64;
typedef double _Complex GoComplex128;
#endif
https://go-review.googlesource.com/c/go/+/653141/2/src/cmd/cgo/out.go#2001