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__tgmath_real_type_sub

   /* The tgmath real type for T, where E is 0 if T is an integer type and
     1 for a floating type.  */
  #define __tgmath_real_type_sub(T, E) \
    __typeof__(*(0 ? (__typeof__(0 ? (double *)0 : (void *)(E)))0               \
                   : (__typeof__(0 ? (T *)0 : (void *)(!(E))))0))

条件演算子の型のルールの一部:

See C99 6.5.15.6