Taking out the 'logic' to a header

CMakeLists.txt

@@ -1,3 +1,6 @@
 cmake_minimum_required (VERSION 3.10)
 project (PerformanceMeasuring)
-add_executable(performance_measuring main.cpp)
+
+set(HEADER_FILES dummy_lib.hpp)
+
+add_executable(performance_measuring main.cpp ${HEADER_FILES})

dummy_lib.hpp

@@ -0,0 +1,17 @@
+#ifndef DUMMY_LIB_HPP
+#define DUMMY_LIB_HPP
+
+#include <vector>
+#include <algorithm>
+
+namespace performance_measuring {
+
+int compute(const std::vector<int>& v)
+{
+	int min = *std::min_element(v.begin(), v.end());
+	return std::count(v.begin(), v.end(), min);
+}
+
+}
+
+#endif

main.cpp

@@ -2,7 +2,8 @@
 #include <ctime>
 
 #include <vector>
-#include <algorithm>
+
+#include "dummy_lib.hpp"
 
 
 std::vector<int> generate_random_numbers(int n, int min, int max)
@@ -15,19 +16,13 @@ std::vector<int> generate_random_numbers(int n, int min, int max)
 	return v;
 }
 
-int compute(const std::vector<int>& v)
-{
-	int min = *std::min_element(v.begin(), v.end());
-	return std::count(v.begin(), v.end(), min);
-}
-
 int main(int /*argc*/, char* /*argv*/[])
 {
 	std::vector<int> v = generate_random_numbers(10000, 0, 100);
 
 	// How many times does the smallest element occurst in the vector?
 
-	int r = compute(v);
+	int r = performance_measuring::compute(v);
 
 	(void)r;