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Why would anyone use set instead of unordered_set?
C++0x is introducing unordered_set which is available in boost and many other places. What I understand is that unordered_set is hash table with O(1) lookup complexity. On the other hand, set is nothing but a tree with log(n) lookup complexity. Why on earth would anyone use set instead ...
HTTP POST using JSON in Java
...
You can make use of Gson library to convert your java classes to JSON objects.
Create a pojo class for variables you want to send
as per above Example
{"name":"myname","age":"20"}
becomes
class pojo1
{
String name;
String age;
//generate setter a...
Java SimpleDateFormat(“yyyy-MM-dd'T'HH:mm:ss'Z'”) gives timezone as IST
...Sep 29 18:46:19 CST 2013
From Java Date Object to ISO 8601 String
And to convert Dateobject to ISO 8601 Standard (yyyy-MM-dd'T'HH:mm:ss'Z') use following code
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'", Locale.US);
sdf.setTimeZone(TimeZone.getTimeZone("GMT")); ...
Create batches in linq
...ite any code. Use MoreLINQ Batch method, which batches the source sequence into sized buckets (MoreLINQ is available as a NuGet package you can install):
int size = 10;
var batches = sequence.Batch(size);
Which is implemented as:
public static IEnumerable<IEnumerable<TSource>> Batch&...
How to launch Safari and open URL from iOS app
...omputed properties I'm guessing). Additionally URL is no longer implicitly convertible to NSURL, must be explicitly converted with as!
UIApplication.sharedApplication.openURL(NSURL(string:"http://www.reddit.com/") as! URL)
New Swift Syntax as of iOS 10.0
The openURL method has been deprecated an...
make_unique and perfect forwarding
...ith its use, in which case no function is exception safe. Consider void f( int *, int* ){}, clearly offers the no throw guarantee, but by your line of reasoning it is not exception safe, as it can be misused. Worse, void f( int, int ) {} is not exception safe either!: typedef unique_ptr<int> u...
Use ffmpeg to add text subtitles [closed]
...peg install has the library in the configuration --enable-libass).
First convert the subtitles to .ass format:
ffmpeg -i subtitles.srt subtitles.ass
Then add them using a video filter:
ffmpeg -i mymovie.mp4 -vf ass=subtitles.ass mysubtitledmovie.mp4
...
Retrieving a List from a java.util.stream.Stream in Java 8
...e collect(Collector) method and you will have to call IntStream.boxed() to convert them to a regular Stream first. Then again, maybe you just want toArray() .
– Mutant Bob
Sep 12 '17 at 19:09
...
warning: implicit declaration of function
... the compiler has not seen a declaration ("prototype") yet.
For example:
int main()
{
fun(2, "21"); /* The compiler has not seen the declaration. */
return 0;
}
int fun(int x, char *p)
{
/* ... */
}
You need to declare your function before main, like this, either directly or ...
How can I hash a password in Java?
...spec).getEncoded();
Base64.Encoder enc = Base64.getEncoder();
System.out.printf("salt: %s%n", enc.encodeToString(salt));
System.out.printf("hash: %s%n", enc.encodeToString(hash));
Here's a utility class that you can use for PBKDF2 password authentication:
import java.security.NoSuchAlgorithmExcep...