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How are virtual functions and vtable implemented?
...ned behavior if it is not defined (which it usually isn't) (ISO/IEC 14882:2003 10.4-2). In practice it does allocate a slot in the vtable for the function but does not assign an address to it. This leaves the vtable incomplete which requires the derived classes to implement the function and complet...
Java: Get month Integer from Date
...ary to cal.get(Calendar.MONTH) in adarshr's answer which gives values from 0 to 11.
But as Basil Bourque said in the comments, the preferred way is to get a Month enum object with the LocalDate::getMonth method.
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What's the complete range for Chinese characters in Unicode?
U+4E00..U+9FFF is part of the complete set,but not all
6 Answers
6
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JSON serialization of Google App Engine models
...h (JS "new Date()").
ms = time.mktime(value.utctimetuple()) * 1000
ms += getattr(value, 'microseconds', 0) / 1000
output[key] = int(ms)
elif isinstance(value, db.GeoPt):
output[key] = {'lat': value.lat, 'lon': value.lon}
elif isinstance...
Why are functions in Ocaml/F# not recursive by default?
...uence in OCaml:
let shannon fold p =
let p x = p x *. log(p x) /. log 2.0 in
let p t x = t +. p x in
-. fold p 0.0
Note how the argument p to the higher-order shannon function is superceded by another p in the first line of the body and then another p in the second line of the body.
Conver...
CMake not able to find OpenSSL library
...
I had the same problem (openssl) and this worked for me on Ubuntu 14.04.1 LTS. The solution is the same up to Ubuntu 18.04 (tested).
sudo apt-get install libssl-dev
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Sequelize Unknown column '*.createdAt' in 'field list'
...sequelize = new Sequelize('sequelize_test', 'root', null, {
host: "127.0.0.1",
dialect: 'mysql',
define: {
timestamps: false
}
});
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Check if a row exists, otherwise insert
... things can overbook a flight, as it will insert a new row when there are 10 tickets max and you are booking 20.
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static function in C
...t); /* prototype */
int f2(int); /* prototype */
int main(void) {
f1(10); /* ok, f1 is visible to the linker */
f2(12); /* nope, f2 is not visible to the linker */
return 0;
}
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Is there a performance difference between i++ and ++i in C?
...
406
Executive summary: No.
i++ could potentially be slower than ++i, since the old value of i
mig...