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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
When to use std::size_t?
...t; get_size_of_stuff(); i++). Now, sure, you might not want to do a lot of raw loops, but - come on, you use them too.
– einpoklum
Feb 10 '16 at 12:56
...
Read first N lines of a file in python
...Nlines
One advantage compared to the other answers is the possibility to select easily the range of lines e.g. skipping the first 10 lines [10:30] or the lasts 10 [:-10] or taking only even lines [::2].
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VIM: Deleting from current position until a space
Often when developing I am confronted with a nested object that I'd like to delete from code in the middle of a line like this:
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Get Character value from KeyCode in JavaScript… then trim
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"LEFT", // [37]
"UP", // [38]
"RIGHT", // [39]
"DOWN", // [40]
"SELECT", // [41]
"PRINT", // [42]
"EXECUTE", // [43]
"PRINTSCREEN", // [44]
"INSERT", // [45]
"DELETE", // [46]
"", // [47]
"0", // [48]
"1", // [49]
"2", // [50]
"3", // [51]
"4", // [52]
"5", // [53]...
java.lang.OutOfMemoryError: bitmap size exceeds VM budget - Android
I developed an application that uses lots of images on Android.
13 Answers
13
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How to perform .Max() on a property of all objects in a collection and return the object with maximu
...c T MaxObject<T,U>(this IEnumerable<T> source, Func<T,U> selector)
where U : IComparable<U> {
if (source == null) throw new ArgumentNullException("source");
bool first = true;
T maxObj = default(T);
U maxKey = default(U);
foreach (var ...
MySQL error code: 1175 during UPDATE in MySQL Workbench
... MySQL workbench, and I'm writing the statement in the SQL editor from inside the workbench. I'm writing the following command:
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Getting output of system() calls in Ruby
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How does HTTP file upload work?
...
Let's take a look at what happens when you select a file and submit your form (I've truncated the headers for brevity):
POST /upload?upload_progress_id=12344 HTTP/1.1
Host: localhost:3000
Content-Length: 1325
Origin: http://localhost:3000
... other headers ...
Conten...