short-circuiting Questions
3
Solved
I know that || and && are defined as short-circuit operators in C#, and such behaviour is guaranteed by the language specification, but do |= and &= short-circuit too?
For example:
pr...
Utgardloki asked 24/10, 2012 at 9:41
4
Solved
TIs ISNULL() a lazy function?
That is, if i code something like the following:
SELECT ISNULL(MYFIELD, getMyFunction()) FROM MYTABLE
will it always evaluate getMyFunction() or will it only evalu...
Glabella asked 31/8, 2012 at 16:40
2
Solved
Consider the following code:
>>> def default_answer():
... print "Default was required!"
... return 100
...
>>> g = { 'name': 'Jordan', 'age': 35 }
>>> result = g.get('...
Birth asked 27/8, 2012 at 18:51
3
Solved
I am currently developing a compiler for a very limited object oriented language. I want to treat all values as objects and operators on those values will be implemented as methods. The compiler tr...
Stafani asked 27/2, 2012 at 8:35
18
Solved
Why would a language NOT use Short-circuit evaluation? Are there any benefits of not using it?
I see that it could lead to some performances issues... is that true? Why?
Related question : Bene...
Colleague asked 18/9, 2009 at 17:28
3
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Some operators such as && and || perform short-circuit evaluation. Also, when a function is called with arguments, all arguments are constructed before calling the function.
For instance, ...
Norine asked 24/2, 2012 at 0:54
5
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I was working on the Basics of C and was trying to solve the problem below could any one explain why the output of variable c is different?
What is the output of the following program?
int main...
Gutsy asked 22/2, 2012 at 16:22
5
Solved
Possible Duplicate:
Does java evaluate remaining conditions after boolean result is known
Why do we usually use || not |, what is the difference?
I missed my class lecture the other ...
Pooka asked 18/2, 2012 at 21:37
2
Solved
This is directly inspired by this question.
There are numerous references/statements that bitwise operators, when applied to booleans, will not short circuit. So in other words boolean a = f() &am...
Sigh asked 13/2, 2012 at 19:17
5
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When comparing to a minimum or maximum of two numbers/functions, does C# short-circuit if the case is true for the first one and would imply truth for the second? Specific examples of these cases a...
Elaterium asked 18/1, 2012 at 19:8
1
Solved
Let's say I have a simple function like this:
int all_true(int* bools, int len) {
if (len < 1) return TRUE;
return *bools && all_true(bools+1, len-1);
}
This function can be rewritt...
Lakendra asked 15/12, 2011 at 4:2
9
Solved
Related Questions: Benefits of using short-circuit evaluation, Why would a language NOT use Short-circuit evaluation?, Can someone explain this line of code please? (Logic & Assignment operator...
Fribble asked 16/11, 2009 at 20:24
6
Solved
In many languages, if you write something along the lines of
if (foo() || bar() || foobar()) { /* do stuff */ }
and foo() returns true, then bar() and foobar() will not be evaluated.
Suppose I...
Scarlettscarp asked 18/11, 2011 at 23:28
2
Solved
We all know about short circuiting in logical expressions, i.e. when
if ( False AND myFunc(a) ) then
...
doesn't bother executing myFunc() because there's no way the if condition can be true.
I...
Scanty asked 16/11, 2011 at 2:27
4
IN Perl it's quite common to do things like function() || alternative(). If the first returns false it will run the second one.
How can this be easily implemented in Python?
Update
Examples (pse...
Norry asked 26/9, 2011 at 9:11
4
Solved
Does it matter how I group subexpressions when dealing with a single short-circuiting operator?
a && b && c && d
a && (b && (c && d))
(a && ...
Sweetener asked 26/8, 2011 at 7:46
7
Solved
What is the difference between the & and && logical operators in MATLAB?
Mellisa asked 4/9, 2009 at 13:52
1
Solved
I was going through operator precedence section of php.net and came across this example which says
$a = 1;
$b = null;
$c = isset($a) && isset($b);
$d = ( isset($a) and isset($b) );
$e = is...
Order asked 8/8, 2011 at 9:54
4
Solved
Whats the meaning of
x AND THEN y AND z
is it
x AND THEN (y AND z)
(y, z gets never evaluated if x is FALSE)
or
(x AND THEN y) AND z
(if x is FALSE, y is skipped, but its possible that z i...
Verlaverlee asked 5/6, 2011 at 20:1
4
Solved
Given a container of boolean values (An example is std::vector<bool>), is there a standard function that returns true if all the values are true ("and") or true if at least one value is true ...
Hokku asked 28/6, 2011 at 12:48
3
Why doesn't bool? support lifted && and ||? They could have lifted the true and false operators which would have indirectly added lifted && and ||.
The operators | and & are al...
Yand asked 5/3, 2011 at 14:24
6
Solved
I have some code like this:
if var:
if var2 == getSomeValue()
This could be in a single expression.
if var and var2 == getSomeValue():
...but getSomeValue() can only be called if var is True...
Bastion asked 3/6, 2011 at 17:45
4
Solved
I am curious why the comma ‹,› is a shortcut for and and not andalso in guard tests.
Since I'd call myself a “C native” I fail to see any shortcomings of short-circuit boolean evaluation.
I compi...
Heres asked 17/5, 2011 at 0:51
2
Solved
Say I have this code:
unsigned int func1();
unsigned int func2();
unsigned int func3();
unsigned int x = func1() | func2() | func3();
Does C++ guarantee that func1() will be called first, then ...
Carpic asked 20/5, 2011 at 23:29
1
Solved
Can someone explain this C++ comma operator short-circuiting example?
bIsTRUE = true, false, true;
bIsFALSE = (true, false), true;
bIsAlsoTRUE = ((true, false), true);
Why does the second versio...
Faxon asked 4/5, 2011 at 0:38
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