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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
Move capture in lambda
...rref.move(); };
assert( lambda() );
assert( !lambda() );
}
The drawback here is that lambda is copyable and when copied the assertion in the copy constructor of rref_impl fails leading to a runtime bug. The following might be a better and even more generic solution because the compiler wi...
“git rm --cached x” vs “git reset head -- x”?
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How to use custom packages
...h information about this. Basically, I have these two files in the same folder:
6 Answers
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Do you (really) write exception safe code? [closed]
...can do something about a specific exception
You almost never want to see a raw new or delete in code
Eschew std::sprintf, snprintf, and arrays in general - use std::ostringstream for formatting and replace arrays with std::vector and std::string
When in doubt, look for functionality in Boost or STL ...
fastest MD5 Implementation in JavaScript
...int plus has incremental mode. It doesn't have Base64 o/p but it does have raw o/p (i.e. array of 32-bit int insead of string).
JQuery MD5 plugin: Very simple down to earth but doesn't seem to have raw mode.
JavaScript-MD5: Not as fancy or fast as Spark but simpler.
Example from CryptoJS:
//just ...
How do you sort an array on multiple columns?
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AsyncTask threads never die
...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 only be used once), a new thread was being created but never terminated.
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How to change XAMPP apache server port?
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QString to char* conversion
...coRico It's not the method toStdString() that's dangerous; it's the use of raw pointers. Or, more specifically, the use of raw pointers from objects whose scopes aren't well-understood.
– notlesh
Oct 20 '19 at 20:23
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