From d1c1af1664c330dab04b87fbf06dd0c67de2e846 Mon Sep 17 00:00:00 2001
From: andreas
Date: Sun, 31 May 2026 13:27:30 +0200
Subject: Cleanup, INCLUDING BREAKING CHANGES.

---
 include/qntan/Qntan.h | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/include/qntan/Qntan.h b/include/qntan/Qntan.h
index 8ed8788..be08b0f 100644
--- a/include/qntan/Qntan.h
+++ b/include/qntan/Qntan.h
@@ -19,7 +19,7 @@
 
 #endif
 
-#ifdef Qntan_USERCONFIG
+#if !defined(Qntan_USERCONFIG) || Qntan_USERCONFIG != 0
 #	include "qntan_userconfig.h"
 #endif
 
@@ -714,17 +714,21 @@ struct Qntan_FileSystem {
 
 
 #ifndef Qntan_FourierTransform_transform
-#	define Qntan_FourierTransform_transform(A, B, C, D) (*A)->transform(A, B, C, D)
+#	define Qntan_FourierTransform_transform(A, B, C, D, E, F) (*A)->transform(A, B, C, D, E, F)
 #endif
 
 struct Qntan_FourierTransform {
 	/**/
-	int (*transform)( struct Qntan_FourierTransform**, float*samples, size_t samples_cnt, float*output );
+	void (*transform)( struct Qntan_FourierTransform**, float*samples, size_t samples_cnt, float*output,
+		void(*onDone)(int err,float*out,Qntan_Cls), Qntan_Cls );
 	/* WARN: There may be implementations producing odd results if
 	 * 'samples' and 'output' overlap.
-	 * @return negative values on erorr. Zero on success.
-	 *
-	 * TODO: Make this async.
+	 * `samples`: Input data to process.
+	 * `output`: An array, at least as large as `samples` where the result
+	 * will be written to.
+	 * `onDone` called when action is done.
+	 * `err` negative values on erorr. Zero on success.
+	 * `out` just the same reference given in `output`,  for convencience reasons.
 	 */
 };
 
@@ -1319,7 +1323,7 @@ struct Qntan_CsvEnc {
 #	define Qntan_JsonEnc_reset(A) (*A)->reset(A)
 #endif
 #ifndef Qntan_JsonEnc_flush
-#	define Qntan_JsonEnc_flush(A) (*A)->flush(A)
+#	define Qntan_JsonEnc_flush(A, B, C) (*A)->flush(A, B, C)
 #endif
 #ifndef Qntan_JsonEnc_objBeg
 #	define Qntan_JsonEnc_objBeg(A) (*A)->objBeg(A)
@@ -1354,9 +1358,8 @@ struct Qntan_JsonEnc {
 	void (*reset)( struct Qntan_JsonEnc** );
 	/* throws away the current state and sets the encoder for a new run.
 	 */
-	void (*flush)( struct Qntan_JsonEnc** );
-	/* TODO: to me, looks like this should be async and take an 'onDone' cback.
-	 */
+	void (*flush)( struct Qntan_JsonEnc**, void(*onDone)(int,Qntan_Cls), Qntan_Cls );
+	/**/
 	void (*objBeg)( struct Qntan_JsonEnc** );
 	/**/
 	void (*objEnd)( struct Qntan_JsonEnc** );
-- 
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