100

02/09/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.12)
+set(CMAKE_CXX_STANDARD 17)
+project(hellocpp LANGUAGES CXX)
+
+add_executable(cpptest main.cpp)

02/09/main.cpp

@@ -0,0 +1,52 @@
+#include <cstdlib>
+#include <iostream>
+#include <cstring>
+
+struct Vector {
+    size_t m_size;
+    int *m_data;
+
+    Vector(size_t n) {
+        m_size = n;
+        m_data = (int *)malloc(n * sizeof(int));
+    }
+
+    ~Vector() {
+        free(m_data);
+    }
+
+    Vector(Vector const &other) {
+        m_size = other.m_size;
+        m_data = (int *)malloc(m_size * sizeof(int));
+        memcpy(m_data, other.m_data, m_size * sizeof(int));
+    }
+
+    Vector &operator=(Vector const &other) {
+        m_size = other.m_size;
+        m_data = (int *)realloc(m_data, m_size * sizeof(int));
+        memcpy(m_data, other.m_data, m_size * sizeof(int));
+        return *this;
+    }
+
+    size_t size() {
+        return m_size;
+    }
+
+    void resize(size_t size) {
+        m_size = size;
+        m_data = (int *)realloc(m_data, m_size);
+    }
+
+    int &operator[](size_t index) {
+        return m_data[index];
+    }
+};
+
+int main() {
+    Vector v1(32);
+    Vector v2(64);
+
+    v2 = v1;
+
+    return 0;
+}

02/09/run.sh

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+set -e
+
+cmake -B build
+cmake --build build
+build/cpptest

02/10/CMakeLists.txt

@@ -0,0 +1,5 @@
+cmake_minimum_required(VERSION 3.12)
+set(CMAKE_CXX_STANDARD 17)
+project(hellocpp LANGUAGES CXX)
+
+add_executable(cpptest main.cpp)

02/10/main.cpp

@@ -0,0 +1,42 @@
+#include <iostream>
+#include <vector>
+
+void test_copy() {
+    std::cout << std::endl << "test copy:" << std::endl;
+
+    std::vector<int> v1(10);
+    std::vector<int> v2(200);
+
+    std::cout << "before:" << std::endl;
+    std::cout << "v1.size() is " << v1.size() << std::endl;
+    std::cout << "v2.size() is " << v2.size() << std::endl;
+
+    v2 = v1;
+
+    std::cout << "after:" << std::endl;
+    std::cout << "v1.size() is " << v1.size() << std::endl;
+    std::cout << "v2.size() is " << v2.size() << std::endl;
+}
+
+void test_move() {
+    std::cout << std::endl << "test move:" << std::endl;
+
+    std::vector<int> v1(10);
+    std::vector<int> v2(200);
+
+    std::cout << "before:" << std::endl;
+    std::cout << "v1.size() is " << v1.size() << std::endl;
+    std::cout << "v2.size() is " << v2.size() << std::endl;
+
+    v2 = std::move(v1);
+
+    std::cout << "after:" << std::endl;
+    std::cout << "v1.size() is " << v1.size() << std::endl;
+    std::cout << "v2.size() is " << v2.size() << std::endl;
+}
+
+int main() {
+    test_copy();
+    test_move();
+    return 0;
+}

02/10/run.sh

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+set -e
+
+cmake -B build
+cmake --build build
+build/cpptest