From 4c69183dab4979f7131b345543c7b1c2ee8dd458 Mon Sep 17 00:00:00 2001
From: diegohce <diego.cena@gmail.com>
Date: Fri, 30 Aug 2024 13:59:57 -0300
Subject: [PATCH] added missing Empty method

---
 contrib/face.cpp           | 4 ++++
 contrib/face.go            | 4 ++++
 contrib/face.h             | 4 ++++
 contrib/face_recognizer.go | 6 ++++++
 contrib/face_test.go       | 2 ++
 5 files changed, 20 insertions(+)

diff --git a/contrib/face.cpp b/contrib/face.cpp
index 9f1bf50e..7d8f458d 100644
--- a/contrib/face.cpp
+++ b/contrib/face.cpp
@@ -1,5 +1,9 @@
 #include "face.h"
 
+bool FaceRecognizer_Empty(FaceRecognizer fr) {
+    return (*fr)->empty();
+}
+
 void FaceRecognizer_Train(FaceRecognizer fr, Mats mats, IntVector labels_in) {
     std::vector<int> labels;
 
diff --git a/contrib/face.go b/contrib/face.go
index ae4ec4b8..925cf40c 100644
--- a/contrib/face.go
+++ b/contrib/face.go
@@ -25,6 +25,10 @@ type LBPHFaceRecognizer struct {
 	p C.LBPHFaceRecognizer
 }
 
+func (fr *LBPHFaceRecognizer) Empty() bool {
+	return faceRecognizer_Empty(C.FaceRecognizer(fr.p))
+}
+
 // NewLBPHFaceRecognizer creates a new LBPH Recognizer model.
 //
 // For further information, see:
diff --git a/contrib/face.h b/contrib/face.h
index 9f3cbeb3..96fa6e2c 100644
--- a/contrib/face.h
+++ b/contrib/face.h
@@ -23,6 +23,7 @@ struct PredictResponse {
     double confidence;
 };
 
+bool FaceRecognizer_Empty(FaceRecognizer fr);
 void FaceRecognizer_Train(FaceRecognizer fr, Mats images, IntVector labels);
 void FaceRecognizer_Update(FaceRecognizer fr, Mats images, IntVector labels);
 int FaceRecognizer_Predict(FaceRecognizer fr, Mat sample);
@@ -44,6 +45,9 @@ int LBPHFaceRecognizer_GetGridX(LBPHFaceRecognizer fr);
 int LBPHFaceRecognizer_GetGridY(LBPHFaceRecognizer fr);
 void LBPHFaceRecognizer_Close(LBPHFaceRecognizer fr);
 
+
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/contrib/face_recognizer.go b/contrib/face_recognizer.go
index adba987c..1b087e94 100644
--- a/contrib/face_recognizer.go
+++ b/contrib/face_recognizer.go
@@ -12,6 +12,7 @@ import (
 )
 
 type FaceRecognizer interface {
+	Empty() bool
 	Train(images []gocv.Mat, labels []int)
 	Update(newImages []gocv.Mat, newLabels []int)
 	Predict(sample gocv.Mat) int
@@ -23,6 +24,11 @@ type FaceRecognizer interface {
 	Close() error
 }
 
+func faceRecognizer_Empty(fr C.FaceRecognizer) bool {
+	b := C.FaceRecognizer_Empty(fr)
+	return bool(b)
+}
+
 func faceRecognizer_Train(fr C.FaceRecognizer, images []gocv.Mat, labels []int) {
 	cparams := []C.int{}
 	for _, v := range labels {
diff --git a/contrib/face_test.go b/contrib/face_test.go
index 3ab3419c..b01ac8de 100644
--- a/contrib/face_test.go
+++ b/contrib/face_test.go
@@ -14,6 +14,8 @@ func TestLBPHFaceRecognizer_Methods(t *testing.T) {
 		t.Errorf("Invalid NewLBPHFaceRecognizer call %v", model)
 	}
 
+	model.Empty()
+
 	labels := []int{1, 1, 1, 1, 2, 2, 2, 2}
 	images := []gocv.Mat{
 		gocv.IMRead("./att_faces/s1/1.pgm", gocv.IMReadGrayScale),