make clang cry less

Main.cpp

@@ -1,7 +1,6 @@
-#include <cassert>
+#include "Vector.h"
 #include <iostream>
 #include <vector>
-#include <new>
 
 // All implementations in this class use ints insteads of size_t because size_t
 // is interely slow compared to ints. C++20 also adds new methods to call for
@@ -54,205 +53,6 @@ struct A {
 
 int A::instances = 0;
 
-template<typename T>
-class Vector {
-    T* data;
-    int capacity;
-    int elements;
-
-public:
-    Vector() : data(nullptr), capacity(0), elements(0) {
-    }
-
-    Vector(int n, const T& t) : Vector() {
-        for(int i = 0; i < n; i++) {
-            push_back(t);
-        }
-    }
-
-    Vector(int n) : Vector(n, T()) {
-    }
-
-    ~Vector() {
-        // placement new needs explicit destructor calling
-        for(int i = 0; i < elements; i++) {
-            data[i].~T();
-        }
-        // casting this pointer not back to its origin type yields a crash
-        delete[] reinterpret_cast<char*>(data);
-    }
-
-    // allocate new storage for copies
-    Vector(const Vector& other)
-        : data(allocate(other.capacity)), capacity(other.capacity),
-          elements(other.elements) {
-        // copy data into new storage
-        for(int i = 0; i < elements; i++) {
-            new(data + i) T(other.data[i]);
-        }
-    }
-
-    // this handles copy and move assigment
-    // copy: replace current resources with other made by the copy constructor
-    // move: replace current resources with other made by the move constructor
-    // other gets the old data and is destroyed by the destructor after going
-    // out of scope
-    Vector& operator=(Vector other) {
-        swap(*this, other);
-        return *this;
-    }
-
-    // construct a default vector so the other vector gets valid values from the
-    // swap
-    Vector(Vector&& other) : Vector() {
-        swap(*this, other);
-    }
-
-    void reserve(int size) {
-        if(size <= capacity) {
-            return;
-        }
-        Vector v;
-        v.capacity = size;
-        v.data = allocate(size);
-        for(int i = 0; i < elements; i++) {
-            v.push_back(std::move(data[i]));
-        }
-        swap(*this, v);
-    }
-
-    void resize(int size, const T& t) {
-        // elements will be equal to size after this call but not the capacity
-        if(size > elements) {
-            // fill until the given size is reached
-            for(int i = elements; i < size; i++) {
-                push_back(t);
-            }
-        } else if(size < elements) {
-            // remove objects until the size matches
-            for(int i = size; i < elements; i++) {
-                data[i].~T();
-            }
-            elements = size;
-        }
-    }
-
-    void resize(int size) {
-        resize(size, T());
-    }
-
-    void push_back(const T& t) {
-        ensureCapacity();
-        new(data + elements++) T(t);
-    }
-
-    void push_back(T&& t) {
-        ensureCapacity();
-        // && would be lost without std::move
-        new(data + elements++) T(std::move(t));
-    }
-
-    T& operator[](int index) {
-        return data[index];
-    }
-
-    const T& operator[](int index) const {
-        return data[index];
-    }
-
-    T& at(int index) {
-        // std states "at" is [] with range check
-        assert(index >= 0 && index < elements);
-        return (*this)[index];
-    }
-
-    const T& at(int index) const {
-        // std states "at" is [] with range check
-        assert(index >= 0 && index < elements);
-        return (*this)[index];
-    }
-
-    int size() const {
-        return elements;
-    }
-
-    T* begin() {
-        return data;
-    }
-
-    T* end() {
-        return data + elements;
-    }
-
-    const T* begin() const {
-        return data;
-    }
-
-    const T* end() const {
-        return data + elements;
-    }
-
-    void erase(T* from, T* to) {
-        T* remove = from;
-        T* move = to;
-        T* stop = end();
-        // fill the hole by moving following objects as long as possible
-        while(move != stop) {
-            *remove = std::move(*move);
-            remove++;
-            move++;
-        }
-        // remove left over objects
-        while(remove != stop) {
-            remove->~T();
-            remove++;
-            elements--;
-        }
-    }
-
-    void erase(T* start) {
-        erase(start, start + 1);
-    }
-
-    T* as_array() {
-        return begin();
-    }
-
-    const T* as_array() const {
-        return begin();
-    }
-
-    void erase_by_swap(int index) {
-        elements--;
-        if(index != elements) {
-            data[index] = std::move(data[elements]);
-        }
-        data[elements].~T();
-    }
-
-    int length() const {
-        return capacity;
-    }
-
-private:
-    static T* allocate(int length) {
-        return reinterpret_cast<T*>(new char[sizeof(T) * length]);
-    }
-
-    static void swap(Vector& a, Vector& b) {
-        std::swap(a.data, b.data);
-        std::swap(a.capacity, b.capacity);
-        std::swap(a.elements, b.elements);
-    }
-
-    void ensureCapacity() {
-        if(elements >= capacity) {
-            // doubling the size amortizes costs
-            reserve(capacity == 0 ? 1 : capacity * 2);
-        }
-    }
-};
-
 void printError(int number) {
     std::cout << "\033[0;31mError " << number << "\033[0m\n";
 }

Makefile

@@ -1,8 +1,11 @@
-all: vector
-	./vector
-
-vector: Main.cpp
-	g++ -std=c++14 -o $@ Main.cpp -Wall -Wextra -Werror -pedantic
-
-clean:
+all: Main.cpp
+	clang++ -std=c++14 -o vector Main.cpp -Wall -Wextra -Werror -pedantic
+
+run: gcc
+	./vector
+
+gcc: Main.cpp
+	g++ -std=c++14 -o vector Main.cpp -Wall -Wextra -Werror -pedantic
+
+clean:
 	rm -f vector

Vector.h

@@ -0,0 +1,206 @@
+#ifndef VECTOR_H
+#define VECTOR_H
+
+#include <cassert>
+#include <new>
+
+template<typename T>
+class Vector {
+    T* data;
+    int capacity;
+    int elements;
+
+public:
+    Vector() : data(nullptr), capacity(0), elements(0) {
+    }
+
+    explicit Vector(int n, const T& t) : Vector() {
+        for(int i = 0; i < n; i++) {
+            push_back(t);
+        }
+    }
+
+    explicit Vector(int n) : Vector(n, T()) {
+    }
+
+    ~Vector() {
+        // placement new needs explicit destructor calling
+        for(int i = 0; i < elements; i++) {
+            data[i].~T();
+        }
+        // casting this pointer not back to its origin type yields a crash
+        delete[] reinterpret_cast<char*>(data);
+    }
+
+    // allocate new storage for copies
+    Vector(const Vector& other)
+        : data(allocate(other.capacity)), capacity(other.capacity),
+          elements(other.elements) {
+        // copy data into new storage
+        for(int i = 0; i < elements; i++) {
+            new(data + i) T(other.data[i]);
+        }
+    }
+
+    // this handles copy and move assigment
+    // copy: replace current resources with other made by the copy constructor
+    // move: replace current resources with other made by the move constructor
+    // other gets the old data and is destroyed by the destructor after going
+    // out of scope
+    Vector& operator=(Vector other) {
+        swap(*this, other);
+        return *this;
+    }
+
+    // construct a default vector so the other vector gets valid values from the
+    // swap
+    Vector(Vector&& other) : Vector() {
+        swap(*this, other);
+    }
+
+    void reserve(int size) {
+        if(size <= capacity) {
+            return;
+        }
+        Vector v;
+        v.capacity = size;
+        v.data = allocate(size);
+        for(int i = 0; i < elements; i++) {
+            v.push_back(std::move(data[i]));
+        }
+        swap(*this, v);
+    }
+
+    void resize(int size, const T& t) {
+        // elements will be equal to size after this call but not the capacity
+        if(size > elements) {
+            // fill until the given size is reached
+            for(int i = elements; i < size; i++) {
+                push_back(t);
+            }
+        } else if(size < elements) {
+            // remove objects until the size matches
+            for(int i = size; i < elements; i++) {
+                data[i].~T();
+            }
+            elements = size;
+        }
+    }
+
+    void resize(int size) {
+        resize(size, T());
+    }
+
+    void push_back(const T& t) {
+        ensureCapacity();
+        new(data + elements++) T(t);
+    }
+
+    void push_back(T&& t) {
+        ensureCapacity();
+        // && would be lost without std::move
+        new(data + elements++) T(std::move(t));
+    }
+
+    T& operator[](int index) {
+        return data[index];
+    }
+
+    const T& operator[](int index) const {
+        return data[index];
+    }
+
+    T& at(int index) {
+        // std states "at" is [] with range check
+        assert(index >= 0 && index < elements);
+        return (*this)[index];
+    }
+
+    const T& at(int index) const {
+        // std states "at" is [] with range check
+        assert(index >= 0 && index < elements);
+        return (*this)[index];
+    }
+
+    int size() const {
+        return elements;
+    }
+
+    T* begin() {
+        return data;
+    }
+
+    T* end() {
+        return data + elements;
+    }
+
+    const T* begin() const {
+        return data;
+    }
+
+    const T* end() const {
+        return data + elements;
+    }
+
+    void erase(T* from, T* to) {
+        T* remove = from;
+        T* move = to;
+        T* stop = end();
+        // fill the hole by moving following objects as long as possible
+        while(move != stop) {
+            *remove = std::move(*move);
+            remove++;
+            move++;
+        }
+        // remove left over objects
+        while(remove != stop) {
+            remove->~T();
+            remove++;
+            elements--;
+        }
+    }
+
+    void erase(T* start) {
+        erase(start, start + 1);
+    }
+
+    T* as_array() {
+        return begin();
+    }
+
+    const T* as_array() const {
+        return begin();
+    }
+
+    void erase_by_swap(int index) {
+        elements--;
+        if(index != elements) {
+            data[index] = std::move(data[elements]);
+        }
+        data[elements].~T();
+    }
+
+    int length() const {
+        return capacity;
+    }
+
+private:
+    static T* allocate(int length) {
+        return reinterpret_cast<T*>(new char[sizeof(T) * length]);
+    }
+
+    static void swap(Vector& a, Vector& b) {
+        std::swap(a.data, b.data);
+        std::swap(a.capacity, b.capacity);
+        std::swap(a.elements, b.elements);
+    }
+
+    void ensureCapacity() {
+        if(elements >= capacity) {
+            // doubling the size amortizes costs
+            reserve(capacity == 0 ? 1 : capacity * 2);
+        }
+    }
+};
+
+#endif