GPT4 作为强大的生产力工具，可以协助各行各业的人员提高生产力。
下文是C++从业人员工作中利用GPT4的代码操作示例。
一、请用可运行C++代码展示模板函数用法
using namespace std;// 定义一个模板函数template <typename T>T get_max(T a, T b) {return (a > b)? a : b;}int main() {int a = 5;int b = 10;float c = 5.5;float d = 10.5;// 使用模板函数cout << "Max of " << a << " and " << b << " is " << get_max(a, b) << endl;cout << "Max of " << c << " and " << d << " is " << get_max(c, d) << endl;return 0;}
Max of 5 and 10 is 10Max of 5.5 and 10.5 is 10.5
二、请用C++代码展示抽象工厂用法
using namespace std;// 抽象产品Aclass AbstractProductA {public:virtual void Operation() = 0;};// 具体产品A1class ConcreteProductA1 : public AbstractProductA {public:void Operation() {cout << "ConcreteProductA1 operation..." << endl;}};// 具体产品A2class ConcreteProductA2 : public AbstractProductA {public:void Operation() {cout << "ConcreteProductA2 operation..." << endl;}};// 抽象产品Bclass AbstractProductB {public:virtual void Operation() = 0;};// 具体产品B1class ConcreteProductB1 : public AbstractProductB {public:void Operation() {cout << "ConcreteProductB1 operation..." << endl;}};// 具体产品B2class ConcreteProductB2 : public AbstractProductB {public:void Operation() {cout << "ConcreteProductB2 operation..." << endl;}};// 抽象工厂class AbstractFactory {public:virtual AbstractProductA* CreateProductA() = 0;virtual AbstractProductB* CreateProductB() = 0;};// 具体工厂1，生产具体产品A1和产品B1class ConcreteFactory1 : public AbstractFactory {public:AbstractProductA* CreateProductA() {return new ConcreteProductA1();}AbstractProductB* CreateProductB() {return new ConcreteProductB1();}};// 具体工厂2，生产具体产品A2和产品B2class ConcreteFactory2 : public AbstractFactory {public:AbstractProductA* CreateProductA() {return new ConcreteProductA2();}AbstractProductB* CreateProductB() {return new ConcreteProductB2();}};int main(){// 创建工厂1AbstractFactory* factory1 = new ConcreteFactory1();AbstractProductA* productA1 = factory1->CreateProductA();AbstractProductB* productB1 = factory1->CreateProductB();productA1->Operation();productB1->Operation();// 创建工厂2AbstractFactory* factory2 = new ConcreteFactory2();AbstractProductA* productA2 = factory2->CreateProductA();AbstractProductB* productB2 = factory2->CreateProductB();productA2->Operation();productB2->Operation();delete factory1;delete productA1;delete productB1;delete factory2;delete productA2;delete productB2;return 0;}
ConcreteProductA1 operation...ConcreteProductB1 operation...ConcreteProductA2 operation...ConcreteProductB2 operation...
三、请用C++代码 展示打开一个串口，并发送一个8bit 指令
int main(){int fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NDELAY);if (fd == -1) {perror("open_port: Unable to open /dev/ttyS0 - ");return(-1);}struct termios options;tcgetattr(fd, &options);cfsetispeed(&options, B9600);cfsetospeed(&options, B9600);options.c_cflag |= (CLOCAL | CREAD);// Set 8 bitoptions.c_cflag &= ~PARENB;options.c_cflag &= ~CSTOPB;options.c_cflag &= ~CSIZE;options.c_cflag |= CS8;tcsetattr(fd, TCSANOW, &options);unsigned char send_buffer[1];send_buffer[0] = 0xA5; // Some 8-bit commandint n = write(fd, send_buffer, sizeof(send_buffer));if (n < 0) {perror("Write failed - ");return -1;}close(fd);return 0;}
四、请用代码展示C++的移动语义
class MyString {private:char* m_data;size_t m_length;public:// 默认构造函数MyString() : m_data(nullptr), m_length(0) {}// 构造函数，从常量字符串生成对象MyString(const char* str) {m_length = strlen(str);m_data = new char[m_length];memcpy(m_data, str, m_length);std::cout << "Copy constructor is called!\n";}// 移动构造函数MyString(MyString&& other) noexcept {m_data = other.m_data;m_length = other.m_length;other.m_data = nullptr;other.m_length = 0;std::cout << "Move constructor is called!\n";}// 移动赋值操作符MyString& operator=(MyString&& other) noexcept {if (this != &other) {delete[] m_data;m_data = other.m_data;m_length = other.m_length;other.m_data = nullptr;other.m_length = 0;}std::cout << "Move assignment operator is called!\n";return *this;}~MyString() {delete[] m_data;}};int main() {MyString str1 = "Hello, world!";MyString str2 = std::move(str1); // 调用移动构造函数str2 = MyString("Hello, C++!"); // 调用移动赋值操作符return 0;}
运行这个程序，输出结果应该是：
Copy constructor is called!Move constructor is called!Copy constructor is called
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