c++ - Compilation Error VisualStudio 2019: complex double

Question

I have integrated WindowFunctions by Window Functions Github into my project using window_functions.c and .h.

Everything compiles ok with the exception of any function using complex double.

The errors I get are

1>windFcns.c
1>G:VSProcessAppsfftwRealDoublefftRealDoublecubicSplineServerwindFcns.c(540,38): error C2143: syntax error: missing ')' before 'type'
1>G:VSProcessAppsfftwRealDoublefftRealDoublecubicSplineServerwindFcns.c(540,41): error C2085: 'z': not in formal parameter list
1>G:VSProcessAppsfftwRealDoublefftRealDoublecubicSplineServerwindFcns.c(540,52): error C2059: syntax error: 'type'
1>G:VSProcessAppsfftwRealDoublefftRealDoublecubicSplineServerwindFcns.c(540,56): error C2059: syntax error: ')'
1>G:VSProcessAppsfftwRealDoublefftRealDoublecubicSplineServerwindFcns.c(605,31): error C2143: syntax error: missing ')' before 'type'
1>G:VSProcessAppsfftwRealDoublefftRealDoublecubicSplineServerwindFcns.c(605,34): error C2085: 'z': not in formal parameter list
1>G:VSProcessAppsfftwRealDoublefftRealDoublecubicSplineServerwindFcns.c(605,45): error C2059: syntax error: 'type'
1>G:VSProcessAppsfftwRealDoublefftRealDoublecubicSplineServerwindFcns.c(605,118): error C2059: syntax error: ')'*

I noticed the comment on the github page::

FFT ... Note that the array pointer is a pointer-to-double rather than a pointer-to-complex-double. This enables the same prototype to be used from C++, which defines complex numbers via templates rather than as a built-in type in the language. Use casting to convert to type from a complex double pointer to a double pointer on ionvocation.

But I didn't understand this.

I also noted that the header declaration for the fft function was different from it's implementation:

void fft(double* z, unsigned size, bool inv); 
static void fft_radix2(complex double* z, unsigned size)

I was puzzled by this.

I am using fftw within this project which uses complex numbers with no issues.

Can anyone help me with this?

question from:https://stackoverflow.com/questions/65946367/compilation-error-visualstudio-2019-complex-double

Answer 1

Waitting for answers