Set QHash and QMap value directly

[caduel]

You can't as QHash and QValue lack a method for inserting that returns a reference to the container. So you can't chain method calls.

try

template<typename KEY,typename VALUE>
struct MapConstructor : public QMap<KEY,VALUE>
{
     MapConstructor<KEY,VALUE>& insert(const KEY &key, const VALUE &value)
     {
           QMap<KEY,VALUE>::insert(key, value);
           return *this;
     }
};
 
QMap<QString,int> aMap = MapConstructor<QString,int>().insert("hello",5).insert("world",5).insert("hell",4);

template<typename KEY,typename VALUE>
struct MapConstructor : public QMap<KEY,VALUE>
{
     MapConstructor<KEY,VALUE>& insert(const KEY &key, const VALUE &value)
     {
           QMap<KEY,VALUE>::insert(key, value);
           return *this;
     }
};

QMap<QString,int> aMap = MapConstructor<QString,int>().insert("hello",5).insert("world",5).insert("hell",4);

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or you could take a look at Boost.Assign, so you don't have to reinvent the wheel.