Problem casting STL complex to fftw_complex

Question

The FFTW manual says that its fftw_complex type is bit compatible to std::complex class in STL. But that doesn\'t work for me:

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Answer 1

reinterpret_cast only works for pointers and references. So you'd have to do this:

#include 
#include 
int main()
{
   std::complex x(1,0);
   fftw_complex fx(*reinterpret_cast(&x));
}

This assumes that fftw_complex has a copy constructor. To avoid problems with strict aliasing, Goz's solution should be preferred.