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error: cannot dynamic_cast ‘b’ (of type ‘class Base*’) to type ‘c...
...{
T _val;
public:
Derived() {}
Derived(T val): _val(val) {}
T raw() {return _val;}
};
int main()
{
Base * b = new Derived<int>(1);
Derived<int> * d = dynamic_cast<Derived<int>* >(b);
cout << d->raw() << endl;
return 0;
}
dynamic_cast
Is 0 a decimal literal or an octal literal?
...
Yes, 0 is an Octal literal in C++.
As per the C++ Standard:
2.14.2 Integer literals [lex.icon]
integer-literal:
decimal-literal integer-suffixopt
octal-literal integer-suffixopt
hexadecimal-literal integer-suffixopt
decimal-literal:
nonzero-digit ...
What is the difference between dynamic and static polymorphism in Java?
...ne provide a simple example that explains the difference between Dynamic and Static polymorphism in Java?
14 Answers
...
Is it good practice to NULL a pointer after deleting it?
... So you're making the argument that there shouldn't have been a raw pointer in the first place, and anything involving said pointer shouldn't be blessed with the term "good practice"? Fair enough.
– Mark Ransom
Dec 18 '09 at 23:09
...
Do HTML5 custom data attributes “work” in IE 6?
...ElementById("geoff");
alert(geoff.getAttribute("data-geoff"));
See MSDN. And although it is mentioned there that you need IE7 to get this to work, I tested this a while ago with IE6 and it functioned correctly (even in quirks mode).
But this has nothing to do with HTML5-specific attributes, of co...
Get the data received in a Flask request
...
To get the raw data, use request.data. This only works if it couldn't be parsed as form data, otherwise it will be empty and request.form will have the parsed data.
from flask import request
request.data
...
Show all Elasticsearch aggregation results/buckets and not just 10
...{
"bairro_count": {
"terms": {
"field": "bairro.raw",
"size": 0
}
}
}
}'
As mentioned in the doc works only for version 1.1.0 onwards
Edit
Updating the answer based on @PhaedrusTheGreek comment.
setting size:0 is deprecated in 2.x onwards,...
AsyncTask threads never die
...s to fetch data in response to the user pressing a button. This works well and keeps the interface responsive while fetching the data, but when I checked out what was going on in the Eclipse debugger, I found out that every time a new AsyncTask was created (which is quite often, because they can o...
How to hide iOS status bar
...
For reference, raw key is UIViewControllerBasedStatusBarAppearance
– William Denniss
Oct 10 '13 at 9:11
1
...
How to read attribute value from XmlNode in C#?
Suppose I have a XmlNode and I want to get the value of an attribute named "Name".
How can I do that?
8 Answers
...