Avoid qualifying a nested type name
suggest changeclass ClassWithAReallyLongName {
public:
class Iterator { /* ... */ };
Iterator end();
};
Defining the member end
with a trailing return type:
auto ClassWithAReallyLongName::end() -> Iterator { return Iterator(); }
Defining the member end
without a trailing return type:
ClassWithAReallyLongName::Iterator ClassWithAReallyLongName::end() { return Iterator(); }
The trailing return type is looked up in the scope of the class, while a leading return type is looked up in the enclosing namespace scope and can therefore require “redundant” qualification.
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