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lenses, fclabels, data-accessor - which library for structure access and mutation is better
...s implementation you use.
Many of these libraries also provide a bunch of extra combinators on top, and usually some form of template haskell machinery to automatically generate lenses for the fields of simple record types.
With that in mind, we can turn to the different implementations:
Implemen...
C/C++ line number
...andard. During preprocessing, they are replaced respectively by a constant string holding an integer representing the current line number and by the current file name.
Others preprocessor variables :
__func__ : function name (this is part of C99, not all C++ compilers support it)
__DATE__ : a str...
ASP.NET MVC - Set custom IIdentity or IPrincipal
...ce
interface ICustomPrincipal : IPrincipal
{
int Id { get; set; }
string FirstName { get; set; }
string LastName { get; set; }
}
CustomPrincipal
public class CustomPrincipal : ICustomPrincipal
{
public IIdentity Identity { get; private set; }
public bool IsInRole(string role) ...
Is there a difference between using a dict literal and a dict constructor?
...o be extra nice. Just as it always seems to offer to convert single-quoted strings into double-quoted -- for no apparent reason.
– maligree
Jul 7 '11 at 12:53
1
...
Entity Framework 5 Updating a Record
...hen to call, for example:
public void UpdatePasswordAndEmail(long userId, string password, string email)
{
var user = new User {UserId = userId, Password = password, Email = email};
Update(user, u => u.Password, u => u.Email);
Save();
}
I like one trip to the database. Its pro...
Binary Data in MySQL [closed]
...mysql_select_db("binary_data");
$data = mysql_real_escape_string(fread(fopen($form_data, "r"), filesize($form_data)));
$result = mysql_query("INSERT INTO binary_data (description, bin_data, filename, filesize, filetype) ".
"VALUES...
Why can tuples contain mutable items?
...der one roof. For example,
s = ('www.python.org', 80)
brings together a string and a number so that the host/port pair can be passed around as a socket, a composite object. Viewed in that light, it is perfectly reasonable to have mutable components.
Immutability goes hand-in-hand with another pr...
How do I automatically update a timestamp in PostgreSQL
... Says so in the Postgres documentation of the types. Varchar has extra CPU cycles to check for the constraint, which doesn't happen on TEXT.
– Rahly
Jun 21 '17 at 15:50
3...
How can I quickly delete a line in VIM starting at the cursor position?
...0p.
Learn more about the black hole register and registers in general for extra VIM fun!
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How do I pass a class as a parameter in Java?
...t b)
{
return a + b;
}
public static void main(String args[])
{
try {
Class cls = Class.forName("method2");
Class partypes[] = new Class[2];
partypes[0] = Integer.TYPE;
partypes[1] = Integer.TYPE;
Me...