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我有一个QMap<QString, QMultiMap<int, QString> > data;
QMap<QString, QMultiMap<int, QString> > data;
如果我说data.value(key); -> 如果不存在该键的值,返回值是什么?
data.value(key);
提前致谢。
一个默认构造QMultiMap<int, QString>,即一个空的多图。
QMultiMap<int, QString>