Qt笔记-QMap自定义键（key）

Posted 2022-08-27 IT1995

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");


    return a.exec();

调试截图如下：

源码打包下载地址：

Qt/QMapKeyCustom at master · fengfanchen/Qt · GitHubThe knowledge point of Qt. Contribute to fengfanchen/Qt development by creating an account on GitHub.https://github.com/fengfanchen/Qt/tree/master/QMapKeyCustom