Updated multiply function in iOS Image Segmenter tests to use C++ vectors

mediapipe/tasks/ios/test/vision/image_segmenter/MPPImageSegmenterTests.mm

@@ -20,6 +20,9 @@
 #import "mediapipe/tasks/ios/vision/image_segmenter/sources/MPPImageSegmenter.h"
 #import "mediapipe/tasks/ios/vision/image_segmenter/sources/MPPImageSegmenterResult.h"
 
+#include <vector>
+#include <iostream>
+
 static MPPFileInfo *const kCatImageFileInfo = [[MPPFileInfo alloc] initWithName:@"cat"
                                                                       type:@"jpg"];
 static MPPFileInfo *const kCatGoldenImageFileInfo = [[MPPFileInfo alloc] initWithName:@"cat_mask"
@@ -34,39 +37,36 @@ static NSString *const kExpectedErrorDomain = @"com.google.mediapipe.tasks";
 constexpr float kSimilarityThreshold = 0.96f;
 constexpr NSInteger kMagnificationFactor = 10;
 
-double sum(const float *mask, size_t size) {
+double sum(const std::vector<float>& mask) {
   double sum = 0.0;
-  for (int i = 0; i < size; i++) {
-    sum += mask[i];
+  for (const float &maskElement : mask) {
+    sum += maskElement;
   }
   return sum;
 }
 
-float *multiply(const float *mask1, const float *mask2, size_t size) {
+std::vector<float> multiply(const float *mask1, const float *mask2, size_t size) {
   double sum = 0.0;
-  float *multipliedMask = (float *)malloc(size * sizeof(float));
-  if (!multipliedMask) {
-    exit(-1);
-  }
+  
+  std::vector<float> multipliedMask;
+  multipliedMask.reserve(size);
+  
   for (int i = 0; i < size; i++) {
-    multipliedMask[i] = mask1[i] * mask2[i];
+    multipliedMask.push_back(mask1[i] * mask2[i]);
   }
-
+  
   return multipliedMask;
 }
 
 double softIOU(const float *mask1, const float *mask2, size_t size) {
-  float *interSectionVector = multiply(mask1, mask2, size);
-  double interSectionSum = sum(interSectionVector, size);
-  free(interSectionVector);
+  std::vector<float> interSectionVector = multiply(mask1, mask2, size);
+  double interSectionSum = sum(interSectionVector);
 
-  float *m1m1Vector = multiply(mask1, mask1, size);
-  double m1m1 = sum(m1m1Vector, size);
-  free(m1m1Vector);
+  std::vector<float> m1m1Vector = multiply(mask1, mask1, size);
+  double m1m1 = sum(m1m1Vector);
 
-  float *m2m2Vector = multiply(mask2, mask2, size);
-  double m2m2 = sum(m2m2Vector, size);
-  free(m2m2Vector);
+  std::vector<float> m2m2Vector = multiply(mask2, mask2, size);
+  double m2m2 = sum(m2m2Vector);
 
   double unionSum = m1m1 + m2m2 - interSectionSum;