From 3cf89e5137ea333e81c2d62716054848ea8e4be5 Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Wed, 26 Jul 2023 16:22:44 +0200
Subject: A2: Add measurement exercise..

---
 a2/measurement.cc | 41 ++++++++++++++++++++++-------------------
 1 file changed, 22 insertions(+), 19 deletions(-)

(limited to 'a2/measurement.cc')

diff --git a/a2/measurement.cc b/a2/measurement.cc
index cf90d52..c624bfa 100644
--- a/a2/measurement.cc
+++ b/a2/measurement.cc
@@ -1,11 +1,3 @@
-#if 0
-import <chrono>;
-import <vector>;
-import <iostream>;
-import <algorithm>;
-import <string>;
-import <thread>;
-#else
 #include <chrono>
 #include <vector>
 #include <iostream>
@@ -13,7 +5,6 @@ import <thread>;
 #include <string>
 #include <thread>
 #include <random>
-#endif
 
 class Measure
 {
@@ -51,7 +42,7 @@ int main()
 	using namespace std::chrono_literals;
 
 	// Sanity check measurement mechanism
-	measure("Sanity check (sleep 100ms):",
+	measure("Sanity check (sleep 100ms)",
 	        []()
 	        {
 		        std::this_thread::sleep_for(100ms);
@@ -63,22 +54,28 @@ int main()
 	//  * Find the 7 in the middle of a vector<int> where all other elements are
 	//    not 7.
 	{
-		std::vector<int> v(1'000'000, 42); // one million items with the int 42
+		std::vector<int> v(10'000'000, 42); // one million items with the int 42
 		v[v.size() / 2] = 7; // set middle item to 7
 		measure("std::find 7 in the middle",
 		        [&v]()
 		        {
-			        std::find(v.begin(), v.end(), 7);
+			        if(std::find(v.begin(), v.end(), 7) == std::end(v))
+			        {
+				        std::cout << "That was unexpected!\n";
+			        }
 		        });
 	}
 
 	//  * Try to find a 7 in a vector<int> where no element is 7
 	{
-		std::vector<int> v(1'000'000, 42); // one million items with the int 42
+		std::vector<int> v(10'000'000, 42); // one million items with the int 42
 		measure("std::find 7 not there",
 		        [&v]()
 		        {
-			        std::find(v.begin(), v.end(), 7);
+			        if(std::find(v.begin(), v.end(), 7) != std::end(v))
+			        {
+				        std::cout << "That was unexpected!\n";
+			        }
 		        });
 	}
 
@@ -88,22 +85,28 @@ int main()
 	//  * Find the x < 7 in the middle of a vector<int> where all other elements
 	//    are >= 7.
 	{
-		std::vector<int> v(1'000'000, 42); // one million items with the int 42
+		std::vector<int> v(10'000'000, 42); // one million items with the int 42
 		v[v.size() / 2] = 5; // set middle item to 5
 		measure("std::find_if x < 7 in the middle",
 		        [&v]()
 		        {
-			        std::find_if(v.begin(), v.end(), [](int x){ return x < 7;});
+			        if(std::find_if(v.begin(), v.end(), [](int x){ return x < 7;}) == std::end(v))
+			        {
+				        std::cout << "That was unexpected!\n";
+			        }
 		        });
 	}
 
 	//  * Try to find an x < 7 in a vector<int> where all elements are >= 7.
 	{
-		std::vector<int> v(1'000'000, 42); // one million items with the int 42
+		std::vector<int> v(10'000'000, 42); // one million items with the int 42
 		measure("std::find_if x < 7 not there",
 		        [&v]()
 		        {
-			        std::find_if(v.begin(), v.end(), [](int x){ return x < 7;});
+			        if(std::find_if(v.begin(), v.end(), [](int x){ return x < 7;}) != std::end(v))
+			        {
+				        std::cout << "That was unexpected!\n";
+			        }
 		        });
 	}
 
@@ -116,7 +119,7 @@ int main()
 		std::uniform_int_distribution<char> distrib('A', 'Z');
 
 		std::vector<std::string> vs;
-		vs.resize(1'000'000);
+		vs.resize(10'000'000);
 		for(auto &str: vs)
 		{
 			str.reserve(20);
-- 
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