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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 10
Max 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A
class AbstractProductA {
public:
virtual void Operation() = 0;
};
// 具体产品A1
class ConcreteProductA1 : public AbstractProductA {
public:
void Operation() {
cout << "ConcreteProductA1 operation..." << endl;
}
};
// 具体产品A2
class ConcreteProductA2 : public AbstractProductA {
public:
void Operation() {
cout << "ConcreteProductA2 operation..." << endl;
}
};
// 抽象产品B
class AbstractProductB {
public:
virtual void Operation() = 0;
};
// 具体产品B1
class ConcreteProductB1 : public AbstractProductB {
public:
void Operation() {
cout << "ConcreteProductB1 operation..." << endl;
}
};
// 具体产品B2
class 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B1
class 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B2
class ConcreteFactory2 : public AbstractFactory {
public:
AbstractProductA* CreateProductA() {
return new ConcreteProductA2();
}
AbstractProductB* CreateProductB() {
return new ConcreteProductB2();
}
};
int main()
{
// 创建工厂1
AbstractFactory* factory1 = new ConcreteFactory1();
AbstractProductA* productA1 = factory1->CreateProductA();
AbstractProductB* productB1 = factory1->CreateProductB();
productA1->Operation();
productB1->Operation();
// 创建工厂2
AbstractFactory* 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 bit
options.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 command
int 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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