c++ - FFTW : how to prevent breaking aliasing rules? -

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i have code uses std::complex<double> type. fftw manual :

if have variable complex<double> *x, can pass directly fftw via reinterpret_cast<fftw_complex*>(x).

however, when in code : 

tmp_spectrum = reinterpret_cast<std::complex<double>*>(fftw_alloc_complex(conf.spectrumsize())); plan_bw_temp = fftw_plan_dft_c2r_1d(conf.fftsize(), reinterpret_cast<fftw_complex*>(tmp_spectrum), tmp_out, fftw_estimate);

i dereferencing type-punned pointer might break strict-aliasing rules [-wstrict-aliasing]. how solve warning ? !

you have 3 options here:

  • just create fftw_complex when need one: fftw_plan_dft_c2r_1d(conf.fftsize(), fftw_complex(tmp_spectrum.real(), tmp_spectrum.imag()), tmp_out, fftw_estimate);
  • don't use c++ language's complex type in code, , use fftw_complex type.
  • disable strict-alias optimizations , enforcement in appropriate translation unit -fno-strict-aliasing. silencing warning not safe might result in broken code.

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