[solved] two operators with the same input?

[billconan]

Hello guys,

I'm trying the new Qt5 json feature. I found that there are two [] operators defined for QJsonObject.

My understanding is that c++ doesn't allow this, because there is no way to tell which one is the one you want to call. They both have the same function name "operator[]" and parameter. But things can compile.

1. QJsonValue QJsonObject::operator[](const QString & key) const
2. QJsonValueRef QJsonObject::operator[](const QString & key)

now, I want to call the first [] operator. I call it like this: jsonObj["key name"]; but what I actually call is the second operator, I get QJsonValueRef instead of QJsonValue.

Question:
How do I call the first operator?

[billconan]

ok, found answer myself:

http://stackoverflow.com/questions/5762042/const-overloaded-operator-function-and-its-invocation