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Programmatically find the number of cores on a machine
...etermine how many worker threads would be effective? Does one need to consider both the number of cores and hyper-threading? unsigned thread::hardware_concurrency() { SYSTEM_INFO info={0}; GetSystemInfo(&info); return info.dwNumberOfProcessors; }
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Selecting the first “n” items with jQuery
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Thank you, a side requirement of my request was about performances, so this the right answer for me. Thanks to the others for pointing out the :lt selector too.
– Omiod
Dec 8 '09 at 10:33
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The Role Manager feature has not been enabled
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If you got here because you're using the new ASP.NET Identity UserManager, what you're actually looking for is the RoleManager:
var roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(new ApplicationDbContext()));
roleManager will ...
implements Closeable or implements AutoCloseable
...d do this in a finally block:
PrintWriter pw = null;
try {
File file = new File("C:\\test.txt");
pw = new PrintWriter(file);
} catch (IOException e) {
System.out.println("bad things happen");
} finally {
if (pw != null) {
try {
pw.close();
} catch (IOException e) {
...
How to serialize SqlAlchemy result to JSON?
...ou could use:
from sqlalchemy.ext.declarative import DeclarativeMeta
def new_alchemy_encoder():
_visited_objs = []
class AlchemyEncoder(json.JSONEncoder):
def default(self, obj):
if isinstance(obj.__class__, DeclarativeMeta):
# don't re-visit self
...
What are the differences between “git commit” and “git push”?
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Remote repository: repository on a server (Github).
git commit: Append a new commit (last commit + staged modifications) to the local repository. (All commits are stored in /.git)
git push, git pull: Sync the local repository with its associated remote repository. push - apply changes from loca...
Speed up the loop operation in R
...rote a function that iterates over a data.frame object. It simply adds a new column to a data.frame and accumulates something. (simple operation). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the runtime.
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PHP PDO: charset, set names?
... you're running an older version of PHP, you must do it like this:
$dbh = new PDO("mysql:$connstr", $user, $password);
$dbh->exec("set names utf8");
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Making a mocked method return an argument that was passed to it
...= mock(Application.class);
when(mock.myFunction(anyString())).thenAnswer(new Answer<String>() {
@Override
public String answer(InvocationOnMock invocation) throws Throwable {
Object[] args = invocation.getArguments();
return (String) args[0];
}
});
assertEquals("...
High Quality Image Scaling Library [closed]
...
/// </summary>
private static object encodersLock = new object();
/// <summary>
/// A quick lookup for getting image encoders
/// </summary>
public static Dictionary<string, ImageCodecInfo> Encoders
{
//get...