在`QMap中搜索的有效方法<qstring, ...> ` 使用 `QStringView`</qstring,>

Question

I have a QVariantMap , which is an alias for QMap<QString, QVariant> . And I have a function which takes QStringView key as argument. I want to search a value in the map by the key.

QVariantMap map;
QStringView key;
QVariant v = map.value(key);

But the third line does not compile. Of course I could convert the string view to QString but this means one extra memory allocation. Is there any way around this which avoids the unnecessary allocation? How to lookup the value by just the string view?

Answer 1

there is no other solution,

1. change the keys type to QStringView or
2. QVariant v = map.value(key.toString());