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Further understanding setRetainInstance(true)
...r example, a configuration change. This is a lot
* easier than using the raw Activity.onRetainNonConfiguratinInstance() API.
*/
public class FragmentRetainInstance extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);...
How to choose an AES encryption mode (CBC ECB CTR OCB CFB)?
...
CCM: A nonce-based AEAD scheme that combines CTR mode encryption and the raw
CBC-MAC. Inherently serial, limiting speed in some contexts. Provably secure, with good bounds, assuming the underlying blockcipher is a good PRP. Ungainly construction that demonstrably does the job. Simpler to implement...
What is the difference between quiet NaN and signaling NaN?
...tion to classify if a NaN is sNaN or qNaN, so let's just print out the NaN raw bytes:
main.cpp
#include <cassert>
#include <cstring>
#include <cmath> // nanf, isnan
#include <iostream>
#include <limits> // std::numeric_limits
#pragma STDC FENV_ACCESS ON
void print_f...
data.table vs dplyr: can one do something well the other can't or does poorly?
...e dplyr for expressiveness on medium data;
feel free to use data.table for raw speed on bigger data.
The flexibility of dplyr also means that you can easily tweak performance
characteristics using the same syntax. If the performance of dplyr with
the data frame backend is not good enough for you, y...
What characters can be used for up/down triangle (arrow without stem) for display in HTML?
...
0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F
Simply insert the corresponding number/letter before the closing semi-colon as above.
&#x219;
← ↑ → ↓ ↔ ↕ ↖ ↗ ↘ ↙ ↚ ↛ ↜ ↝ ↞ ↟
&#x21A;
↠ ↡ ↢ ↣ ↤ ↥ ↦ ↧ ...
What does “coalgebra” mean in the context of programming?
...s, I'll talk about Haskell types instead. (I can't resist using some Greek letters though—they make everything look cooler!)
An algebra, then, is just a type τ with some functions and identities. These functions take differing numbers of arguments of type τ and produce a τ: uncurried, they all...
How can I transform between the two styles of public key format, one “BEGIN RSA PUBLIC KEY”, the oth
...;setPublicKey();
echo $rsa->getPublicKey(CRYPT_RSA_PUBLIC_FORMAT_PKCS1_RAW);
The base64-encoded stuff appears to match even though the header says BEGIN PUBLIC KEY and not BEGIN RSA PUBLIC KEY. So maybe just use str_replace to fix that and you should be good to go!
...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
... shorthand for [A-Za-z0-9_].
[\w\-]+ for "slug"-style path segments, using letters, numbers, dash - and _
[\w\-.,]+ adds periods and commas. Prefer an escaped \- dash in […] charclasses.
\. denotes a literal period. Otherwise . outside of […] is placeholder for any symbol.
Each of these placeh...
How do I use extern to share variables between source files?
...(void) { printf("l = %ld\n", l); }
This technique does not conform to the letter of the C standard and the
'one definition rule' — it is officially undefined behaviour:
J.2 Undefined behavior
An identifier with external linkage is used, but in the program there
does not exist exactly one exter...
【内核源码】linux UDP实现 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...* or non-page data.
*
* Not only UDP, other transport protocols - e.g. raw sockets - can use
* this interface potentially.
*
* LATER: length must be adjusted by pad at tail, when it is required.
*/
int ip_append_data(struct sock *sk, struct flowi4 *fl4,
int getfrag(void *from, cha...