如何重命名QMap的Key?

How to rename Key for QMap?

我有这个QMap<int, myDB> myTable像这样

(1, {something0})
(3, {something1})
(5, {something2})
(8, {something3})

如何更改 myTable 的第一个密钥从 0 开始的密钥?

(0, {something0})
(1, {something1})
(2, {something2})
(3, {something3})

不能直接在原始地图中更改键,而是创建另一个地图,将值分配给具有重组键的另一个地图,然后使用QMap::swap替换原始地图项。片段看起来像

//Make sure myDB is assignable
QMap<int, myDB> other;
QList<int> keys = myTable.uniqueKeys();
for (int k = 0; k < keys.length(); k++) {
    int key = keys[k];

    //We're using insertMulti in case
    //we have multiple values associated to single key
    QList<myDB> values = myTable.values(key);
    for (int j = 0; j < values.length(); j++) {
        other.insertMulti(k, values.at(j));
    }
}
myTable.swap(other);