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How to make a HTTP request using Ruby on Rails?
...don't reinvent the wheel, and you benefit from the hard work others have already done. If a gem exists that makes your life easier, there's generally no good reason not to use it.
– Marnen Laibow-Koser
Apr 10 '18 at 22:27
...
Cross Domain Form POSTing
...ferent protocol or domain or port), it is all about restricting access to (reading) response data from another url (and thereby preventing javascript to update document with forms that have security tokens from other url).
– Mohsenme
May 7 '15 at 22:46
...
In a Django form, how do I make a field readonly (or disabled) so that it cannot be edited?
In a Django form, how do I make a field read-only (or disabled)?
26 Answers
26
...
Copy entire contents of a directory to another using php
... $dir = opendir($src);
@mkdir($dst);
while(false !== ( $file = readdir($dir)) ) {
if (( $file != '.' ) && ( $file != '..' )) {
if ( is_dir($src . '/' . $file) ) {
recurse_copy($src . '/' . $file,$dst . '/' . $file);
}
...
When to encode space to plus (+) or %20?
...rt" it but what does that mean? It's either the server or client code that reads the query string and decodes it, not the browser. The browser simply passes it back and forth, and since the + is a reserved character it will be preserved by the browser.
– Dave Van den Eynde
...
Why does scanf() need “%lf” for doubles, when printf() is okay with just “%f”?
Why is it that scanf() needs the l in " %lf " when reading a double , when printf() can use " %f " regardless of whether its argument is a double or a float ?
...
How to call an external command?
...ocess.Popen("echo Hello World", shell=True, stdout=subprocess.PIPE).stdout.read()
instead of:
print os.popen("echo Hello World").read()
but it is nice to have all of the options there in one unified class instead of 4 different popen functions. See the documentation.
The call function from th...
How do I forward declare an inner class? [duplicate]
...mplates:
// Foo.h
struct Foo
{
export template<class T> void Read(T it);
};
// Foo.cpp
#include "Foo.h"
#include "Container.h"
/*
struct Container
{
struct Inner { };
};
*/
export template<>
void Foo::Read<Container::Inner>(Container::Inner& it)
{
}
#inc...
Correct format specifier for double in printf
...nter, which is not promoted, so you have to tell scanf whether you want to read a float or a double, so for scanf, %f means you want to read a float and %lf means you want to read a double (and, for what it's worth, for a long double, you use %Lf for either printf or scanf).
1. C99, §6.5.2.2/6:...
C# vs Java generics [duplicate]
...ks here and there (most notably in constraints). But basically if you can read one, you can likely read/use the other.
The biggest difference though is in the implementation.
Java uses the notion of type erasure to implement generics. In short the underlying compiled classes are not actually...