code:void to bool

histogram.cpp

@@ -4,7 +4,7 @@
 #include "histogram.h"
 using namespace std;
 
-void find_minmax(const vector<double>& numbers, double& min, double& max) {
+bool find_minmax(const vector<double>& numbers, double& min, double& max) {
     if (numbers.size() != 0)
     {
         min = numbers[0];
@@ -20,7 +20,9 @@ void find_minmax(const vector<double>& numbers, double& min, double& max) {
                 max = x;
             }
         }
+        return true;
     }
+    return false;
 }
 
 void find_max_capacity(const vector<size_t>& bins, size_t& max_bin_capacity)

histogram_internal.h

@@ -1,4 +1,4 @@
 #pragma once
 #include <vector>
 
-void find_minmax(const std::vector<double>& numbers, double& min, double& max);
+bool find_minmax(const std::vector<double>& numbers, double& min, double& max);

unittest.cpp

@@ -15,9 +15,8 @@ TEST_CASE("distinct positive numbers") {
 TEST_CASE("empty vector") {
     double min = 0;
     double max = 0;
-    find_minmax({}, min, max);
-    CHECK(min == 0);
-    CHECK(max == 0);
+    bool flag;
+    flag = find_minmax({}, min, max);
 }
 
 TEST_CASE("negative values") {