Question

我有以下课程：

class Friend
{
public:
    Friend();
    ~Friend(){}
    void setName(string friendName){ name = friendName; }
    void setAge(int friendAge) { age = friendAge; }
    void setHeight(int friendHeight) { height = friendHeight; }
    void printFriendInfo();

private:
    string name;
    int age;
    float height;
};
//implementations
Friend::Friend()
{
    age = 0;
    height = 0.0;
}
//printing
void Friend::printFriendInfo()
{
    cout << "Name       : " << name << endl;
    cout << "Age        : " << age << endl;
    cout << "Height     : " << height << endl << endl;
}

此时我可以在矢量中引入值，如下所示：

std::vector<Friend> regist(4, Friend());

regist[1].setAge(15);
regist[1].setHeight(90);
regist[1].setName("eieiei");
regist[2].setAge(40);
regist[2].setHeight(85);
regist[2].setName("random");

在调试中，此解决方案正常工作。但现在我正在尝试打印矢量。到目前为止没有成功。

for (int i = 0; i < regist.size(); i++) {
        cout << regist[i]; //<-- error here
        cout << '\n';
    }

Answer 1

只需致电$client = new Services_Twilio($AccountSid, $AuthToken); foreach ($client->account->messages->getIterator(0, 50, array()) as $message) { foreach ($message->media as $media) { echo "http://api.twilio.com" . $media->uri; } }会员功能：

printFriendInfo()

Answer 2

有关

    cout << regist[i];

开始工作，在Friend

中添加一些辅助功能

string getName() const { return name; }
int getAge() const { return age; }
float getHeight() const { return height; }

并实现一个重载的operator<<函数：

std::ostream& operator<<(std::ostream& out, Friend const& f)
{
    out << "Name       : " << f.getName() << std::endl;
    out << "Age        : " << f.getAge() << std::endl;
    out << "Height     : " << f.getHeight() << std::endl;
    return out;
}

Answer 3

您可能会重新设计一点（实质上）：

#include <iostream>

class Friend
{
public:
    Friend();
    // A more general name, const, and taking a stream.
    void write(std::ostream&) const;

private:
    std::string name;
    int age;
    float height;
};

Friend::Friend()
{
    age = 0;
    height = 0.0;
}

void Friend::write(std::ostream& stream) const
{
    stream << "Name       : " << name << std::endl;
    stream << "Age        : " << age << std::endl;
    stream << "Height     : " << height << std::endl << std::endl;
}

// Forward to the member function
inline std::ostream& operator << (std::ostream& stream, const Friend& object) {
    object.write(stream);
    return stream;
}

int main() {
    Friend f;
    std::cout << f;
}

Vector的访问元素 - C ++

3 个答案: