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What is the difference between LL and LR parsing?
...n at the start symbol and try to apply productions to arrive at the target string, whereas LR parsers begin at the target string and try to arrive back at the start symbol.
An LL parse is a left-to-right, leftmost derivation. That is, we consider the input symbols from the left to the right and at...
Is non-blocking I/O really faster than multi-threaded blocking I/O? How?
...quest as done and set an event that signals the callers thread. Even if an extra thread was required the OS would be able to use that thread for multiple IO requests from multiple threads.
– Werner Henze
Nov 26 '15 at 9:00
...
My attempt at value initialization is interpreted as a function declaration, and why doesn't A a(())
...st one argument. One of built-in classes which takes two arguments is std::string
std::string hundred_dots(100, '.');
This is all well and fine (technically, it would have most vexing parse if it would be written as std::string wat(int(), char()), but let's be honest - who would write that? But l...
JavaScript checking for null vs. undefined and difference between == and ===
...here "truthy" is a non-zero, non-null, non-undefined, non-false, non-empty-string value. :-)
– T.J. Crowder
Feb 24 '11 at 10:10
2
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Set folder browser dialog start location
...Impersonate code (with LogonType LOGON32_LOGON_INTERACTIVE ) returns empty string
– Kiquenet
Mar 15 '17 at 10:12
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How do short URLs services work?
...www.mytinyurl.com/fif
"fif" would then be passed to your method, RouteURL(String UrlID). RouteURL would then convert "fif" to its base10 equivalent, 20103, and a database request will be made to redirect to whatever URL is stored under the ID 20103 (in this case, www.digg.com). You would also incr...
Unable to simultaneously satisfy constraints, will attempt to recover by breaking constraint
...T:
extension NSLayoutConstraint {
override public var description: String {
let id = identifier ?? ""
return "id: \(id), constant: \(constant)" //you may print whatever you want here
}
}
OBJECTIVE-C
@interface NSLayoutConstraint (Description)
@end
@implementation NSL...
How do we use runOnUiThread in Android?
...then call this function from your background thread.
public void debugMsg(String msg) {
final String str = msg;
runOnUiThread(new Runnable() {
@Override
public void run() {
mInfo.setText(str);
}
});
}
...
LINQ - Full Outer Join
...zed, right now.
See it live on http://ideone.com/O36nWc
static void Main(string[] args)
{
var ax = new[] {
new { id = 1, name = "John" },
new { id = 2, name = "Sue" } };
var bx = new[] {
new { id = 1, surname = "Doe" },
new { id = 3, surname = "Smith" } };...
When is JavaScript's eval() not evil?
...see my specific remarks below).
Code injection - eval() potentially runs a string of code under elevated privileges. For example, a program running as administrator/root would never want to eval() user input, because that input could potentially be "rm -rf /etc/important-file" or worse. Again, JavaS...