Solved Lab2

Lab2/README.md

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+# CCIoT Homework Lab 2
+
+## Slide 12
+
+### Problem
+
+Try the following:
+
+1. Create a vector of whatever type you like (minimum length of 10);
+2. Print it’s content;
+3. Erase the odd elements;
+4. Replace the first element and the last element with another value;
+5. Create a rule that erases the 5th element from the vector;
+6. Use cppreference in the meantime ☺
+
+### Solution
+
+See [slide12.cpp](./slide12.cpp).
+
+## Slide 13
+
+### Problem
+
+Try the same stuff with std::list, observe the differences.
+
+### Solution
+
+See [slide13.cpp](./slide13.cpp).
+
+The difference observed is at line 38.
+Because `std::list` has a bidirectional iterator, not a random access one, skipping 4 elements cannot be done.
+Instead, I had to use `std::next` in order to advance the iterator 4 times separately in order to find the 5th element and erase it.

Lab2/slide12.cpp

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+#include <iostream>
+#include <vector>
+
+// 2.
+template <class T>
+void printEnumerable(const T &enumerable) {
+	bool first = true;
+	for (const auto& item : enumerable) {
+		if (first) first = false;
+		else std::cout << ", ";
+
+		std::cout << item;
+	}
+	std::cout << std::endl;
+}
+
+// 4.
+template <class T, typename V>
+void replaceFirstLast(T& enumerable, const V& newValue) {
+	*std::begin(enumerable) = newValue;
+	*std::rbegin(enumerable) = newValue;
+}
+
+// 5.
+template <class T>
+void erase5th(T& enumerable) {
+	enumerable.erase(std::begin(enumerable) + 4);
+}
+
+int main() {
+	// 1.
+	std::vector<int> v {8, 4, 6, 1, 5, 3, 9, 5, 8, 123, 1, 2, 31, 24, 124, 12, 42, 131};
+	
+	// 2.
+	printEnumerable(v);
+
+	// 4.
+	replaceFirstLast(v, 7);
+
+	// 5.
+	erase5th(v);
+
+	// Print again to see changes
+	printEnumerable(v);
+
+	return 0;
+}

Lab2/slide13.cpp

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+#include <iostream>
+#include <list>
+
+// 2.
+template <class T>
+void printEnumerable(const T &enumerable) {
+	bool first = true;
+	for (const auto& item : enumerable) {
+		if (first) first = false;
+		else std::cout << ", ";
+
+		std::cout << item;
+	}
+	std::cout << std::endl;
+}
+
+// 4.
+template <class T, typename V>
+void replaceFirstLast(T& enumerable, const V& newValue) {
+	*std::begin(enumerable) = newValue;
+	*std::rbegin(enumerable) = newValue;
+}
+
+// 5.
+template <class T>
+void erase5th(T& enumerable) {
+	enumerable.erase(std::next(std::begin(enumerable), 4));
+}
+
+int main() {
+	// 1.
+	std::list<int> v {8, 4, 6, 1, 5, 3, 9, 5, 8, 123, 1, 2, 31, 24, 124, 12, 42, 131};
+	
+	// 2.
+	printEnumerable(v);
+
+	// 4.
+	replaceFirstLast(v, 7);
+
+	// 5.
+	erase5th(v);
+
+	// Print again to see changes
+	printEnumerable(v);
+
+	return 0;
+}

README.md

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 # CCIoT Homework
 
 - [Lab1](./Lab1/)
+- [Lab2](./Lab2/)