Qt笔记-QMap自定义键（key）

如下key值：

struct MyKey{

    MyKey(QString key1, int key2){

        this->key1 = key1;
        this->key2 = key2;
    }

    QString key1;
    int key2;
};

自定义key时会出现如下问题：

需要重写左操作符号，如下：

struct MyKey{

    MyKey(QString key1, int key2){

        this->key1 = key1;
        this->key2 = key2;
    }

    bool operator < (const MyKey &key) const{

		return std::tie(key1, key2) < std::tie(key.key1, key.key2);
    }

    QString key1;
    int key2;
};

所有源码如下：

#include <QCoreApplication>
#include <QMap>
#include <QDebug>

struct MyKey{

    MyKey(QString key1, int key2){

        this->key1 = key1;
        this->key2 = key2;
    }

    bool operator < (const MyKey &key) const{

		return std::tie(key1, key2) < std::tie(key.key1, key.key2);
    }

    QString key1;
    int key2;
};

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    QMap<MyKey, QString> map;
    map.insert(MyKey("10086", 0), "value1");
    map.insert(MyKey("10086", 1), "value2");
    map.insert(MyKey("10086", 2), "value3");
    map.insert(MyKey("10010", 1), "value4");
    map.insert(MyKey("10010", 2), "value5");

![image.png](https://p6-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/0450397668e041619bd73948730a09cd~tplv-k3u1fbpfcp-watermark.image?)

    return a.exec();
}

调试截图如下：

源码打包下载地址：

github.com/fengfanchen…