learning-by-doing/21st_century_c/chapter11/cplx.h

#include <complex.h>
#include <gsl/gsl_vector.h>



gsl_vector_complex *cvec_dot_gslcplx(gsl_vector_complex *v, gsl_complex x);
gsl_vector_complex *vec_dot_gslcplx(gsl_vector *v, gsl_complex x);
gsl_vector_complex *cvec_dot_c(gsl_vector_complex *v, complex double x);
gsl_vector_complex *vec_dot_c(gsl_vector *v, complex double x);
void gsl_vector_complex_print(gsl_vector_complex *v);

#define gsl_cplx_from_c99(x) (gsl_complex){.dat = {creal(x), cimag(x)}}

complex double ddot(complex double x, complex double y);


#define dot(x, y) _Generic((x),                                   \
                    gsl_vector*         : dot_given_vec(y),       \
                    gsl_vector_complex* : dot_given_cplx_vec(y),  \
                    default             : ddot)                   \
                    ((x), (y))


#define dot_given_vec(y) _Generic ((y),                    \
                           gsl_complex : vec_dot_gslcplx,  \
                           default     : vec_dot_c)


#define dot_given_cplx_vec(y) _Generic((y),                      \
                                gsl_complex : cvec_dot_gslcplx,  \
                                default     : cvec_dot_c)