short-circuiting Questions
2
Solved
I am working on optimizing some heavily used stored procedures and ran across a scenario that raised a question that I couldn't find any answers for: when evaluating TSQL in a stored procedure, doe...
Addle asked 14/12, 2014 at 23:6
1
Pre-C++11 we know that short-circuiting and evaluation order are required for operator && because of:
1.9.18
In the evaluation of the following expressions
a && b
a || b
a ? ...
Tetrachord asked 15/11, 2014 at 5:42
6
Solved
Yes, this is a homework question, but I've done my research and a fair amount of deep thought on the topic and can't figure this out. The question states that this piece of code does NOT exhibit sh...
Pensionary asked 13/10, 2014 at 15:17
9
Solved
The short circuiting behaviour of the operators && and || is an amazing tool for programmers.
But why do they lose this behaviour when overloaded? I understand that operators are merely sy...
Lupine asked 18/9, 2014 at 12:56
4
Solved
I need to query data from a second table, but only if a rare set of conditions in the primary table is met:
SELECT ..., IF(a AND b AND c AND (SELECT 1 FROM tableb ...)) FROM tablea ...
a, b, and...
Plath asked 14/9, 2010 at 21:35
3
Solved
VBA doesn't short-circuit
VBA does not support short-circuiting - apparently because it only has bitwise And/Or/Not etc operations. From the VBA language specification: "Logical operators ar...
Ruthannruthanne asked 8/7, 2014 at 21:29
2
Solved
Does haskell have a parallel "and" method
parAnd :: Bool -> Bool -> Bool
such that
(a `parAnd` b)
will spark the evaluation of a and b in parallel and return false as soon as either a o...
Deodand asked 14/6, 2014 at 19:54
4
Solved
I wish to use the Python all() function to help me compute something, but this something could take substantially longer if the all() does not evaluate as soon as it hits a False. I'm thinking it p...
Supersaturate asked 22/6, 2013 at 1:12
3
Solved
I'm looking for guidance for a problem logically equivalent to the following:
public boolean parallelOR() {
ExecutorService executor = Executors.newFixedThreadPool(2);
Future<Boolean> task...
Cryptanalysis asked 3/5, 2014 at 0:32
2
Solved
suppose i have two functions, boolean fA() and boolean fB()
if i write another function function(boolean b) and I call function(fA()||fB()) then fB() might not be executed, if fA() returns true.
...
Submit asked 22/4, 2014 at 14:40
5
Solved
So, I have made this function called tryMap which is as follows:
/// tryMap, with failure and success continuations.
let rec tryMapC : 'R -> ('U list -> 'R) -> ('T -> 'U option) -> ...
Cove asked 16/4, 2014 at 3:31
6
Solved
When writing code like this in C++:
bool allTrue = true;
allTrue = allTrue && check_foo();
allTrue = allTrue && check_bar();
check_bar() will not be evaluated if check_foo() retu...
Exotoxin asked 16/4, 2014 at 10:43
8
Solved
There are two if statements below that have multiple conditions using logical operators. Logically both are same but the order of check differs. The first one works and the second one fails.
I ref...
Gerrit asked 23/5, 2013 at 10:5
5
Is there an equivalent to VB's AndAlso/OrElse and C#'s &&/|| in SQL (SQL Server 2005). I am running a select query similar to the following:
SELECT a,b,c,d
FROM table1
WHERE
(@a IS NULL O...
Janusfaced asked 30/10, 2009 at 11:18
3
Solved
I've become fond of PHP's support for the "short ternary", omitting the second expression:
// PHP
$foo = 'hello';
$bar = '';
echo $foo ?: 'world'; // hello
echo $bar ?: 'world'; // world
Does ...
Ignatz asked 14/9, 2011 at 4:39
2
Solved
I've been trying to replicate short circuit evaluation in javascript for assignment.
E.g. in Javascript
var myObject = {foo: 'bar'};
// if myObject is undefined then assign an empty array
var obj...
Windflower asked 19/12, 2013 at 12:46
3
Solved
Does Python support short-circuiting in boolean expressions?
Myra asked 5/4, 2010 at 18:19
4
Solved
I have lots of computations, specially multiplication, where first part is sometimes zero and I don't want to evaluate second operand in that case. There are at least two short-circuit operators in...
Valeta asked 4/5, 2013 at 14:44
4
Solved
In Python we can do this:
if True or blah:
print("it's ok") # will be executed
if blah or True: # will raise a NameError
print("it's not ok")
class Blah:
pass
blah = Blah()
if blah or blah.n...
Earthward asked 17/4, 2013 at 20:19
6
Solved
As I understand and read you can use short circuiting in if statement (&& or ||) in order for second condition not to fire. and if you want both condition to fire you would use single opera...
Dihydric asked 1/3, 2013 at 11:57
3
Solved
I can't find the relevant portion of the spec to answer this.
In a conditional operator statement in Java, are both the true and false arguments evaluated?
So could the following throw a NullPoint...
Hainan asked 10/6, 2009 at 21:47
1
Solved
From Wikipedia:
Lazy evaluation is:
In programming language theory, lazy evaluation or call-by-need is
an evaluation strategy which delays the evaluation of an expression
until its value is n...
Mathison asked 16/2, 2013 at 8:45
5
Solved
What is the difference between the | and || logical operators in MATLAB?
Amidships asked 6/1, 2013 at 15:4
12
Solved
I'd like to know if someone knows the way a compiler would interpret the following code:
#include <iostream>
using namespace std;
int main() {
cout << (true && true || false ...
Airiness asked 31/10, 2010 at 5:6
4
In general, the short circuit or operator || ignores the right side of the or if the left side evaluates to true. Apparently, we've found an exception to this.
Check out the following:
if (foo ==...
Daisey asked 9/11, 2012 at 17:37
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