expression Questions
6
Solved
What's the difference between those PHP if expressions!?
if ($var !== false)
{
// Do something!
}
if (false !== $var)
{
// Do something!
}
Some frameworks like Zend Framework uses the latest...
Cassella asked 21/4, 2010 at 13:31
9
Solved
In C# is it guaranteed that expressions are evaluated left to right?
For example:
myClass = GetClass();
if (myClass == null || myClass.Property > 0)
continue;
Are there any languages tha...
Harrietteharrigan asked 3/12, 2008 at 10:29
3
Solved
I currently use C for numerical computations. I've heard that using C++ Expression Templates is better for scientific computing. What are C++ Expression Templates in simple terms?
Are there book...
Domett asked 8/4, 2010 at 8:49
3
I want to evaluate one expression in C++. To evaluate it, I want the expression to be converted to prefix format.
Here is an example
wstring expression = "Feature1 And Feature2";
Here are poss...
Polymorphous asked 1/4, 2010 at 4:41
5
Solved
I had used several ways to do some simple integer arithmetic in BASH (3.2). But I can't figure out the best (preferred) way to do it.
result=`expr 1 + 2`
result=$(( 1 + 2 ))
let "result = 1 + 2"
...
Prorate asked 25/3, 2010 at 17:7
3
Is anyone aware of an online resource where I can find out how to write a simple expression parser using Boost::Spirit?.
I do not necessarily need to evaluate the expression, but I need to parse i...
Lowe asked 27/2, 2010 at 23:28
1
Solved
I have an Expression<Func<T,DateTime>> I want to take the DateTime part of the expression and pull the Month off of it. So I would be turning it into a Expression<Func<T,int>&g...
Elementary asked 4/3, 2010 at 7:14
4
Solved
It may sound a bit trivial but it actually is quite frustrating:
Can anyone explain me this:
[~:user$]expr 3 + 2
6
[~:user$]expr 3 / 2
1
[~:user$]expr 3 * 2
expr: syntax error
When the man page...
Divulgence asked 31/1, 2010 at 10:14
7
Solved
I am writing an application that allows a user to enter a boolean expression. I need the ability to evaluate the entered boolean expression at runtime and am looking for both a parser and a express...
Placatory asked 18/2, 2010 at 20:33
2
Ok, here's a tricky one. Hopefully there is an expression guru here who can spot what I am doing wrong here, cause I am just not getting it.
I am building up expressions that I use to filter queri...
Entry asked 20/1, 2010 at 22:26
2
Solved
I had a part of code that takes in lambda expressions at runtime, which I can then compile and invoke.
Something thing;
Expression<Action<Something>> expression = (c => c.DoWork())...
Administrative asked 20/1, 2010 at 19:53
3
I am trying to implement certain matrix operations but I am lost in the internals of ublas library. is there a resource such as tutorial or an example on how to implement new ublas matrix expressio...
Wintertime asked 17/1, 2010 at 1:12
3
Solved
I want regular expression for HH:MM:SS AM/PM here HH must be 1-12 only, MM must 60 min, SS as usual (60 sec.) I any have it properly ...?
Shuck asked 16/1, 2010 at 7:56
2
Solved
I wanna do something like that
public IQueryable GetPaged<TSource>(IQueryable<TSource> query, int startIndex, int pageSize)
{
return GetSession()
.Linq<TSource>()
.UseQuery(...
Jansen asked 9/1, 2010 at 21:27
3
Solved
A few days back there was a discussion here about whether the expression
i = ++i + 1
invokes UB
(Undefined Behavior) or not.
Finally the conclusion was made that it invokes UB as the value o...
Caftan asked 13/12, 2009 at 8:29
1
Solved
My system: Ubuntu 9.10. Eclipse 3.5.1 with Java EE 1.2.1 (manual install - NOT from synaptic). Web Developer Tools 3.1.1
I've recently adopted someone else's code (a Dynamic Web Project), and run ...
Amundson asked 24/11, 2009 at 15:20
2
Solved
Given:
WHERE (@Id Is NULL OR @Id = Table.Id)
If @Id is null: the expression evaluates to true. Does the second part @Id = Table.Id still get considered? or is it sufficient that the expression e...
Eastbound asked 19/11, 2009 at 5:10
4
Solved
Why is the expression specified inside a comma operator (such as the example below) not considered a constant expression?
For example,
int a = (10,20) ;
when given in global scope yields an err...
Wakerobin asked 15/11, 2009 at 14:21
5
Solved
I have read several articles and several stackoverflow.com posts about expression tree.
It is beating my brain to understand.
Questions:
1) Like DOM (Document Object Model), it is an in-memory r...
Wilber asked 19/10, 2009 at 14:22
3
Solved
What exactly is Expression<> used for in C#? Are there any scenarios where you would instantiate Expression<>'s yourself as an object? If so, please give an example!
Thank you!
Ostosis asked 15/9, 2009 at 5:27
1
Solved
I'm currently doing some last-measure optimizations, mostly for fun and learning, and discovered something that left me with a couple of questions.
First, the questions:
When I construct a metho...
Caespitose asked 18/8, 2009 at 21:39
1
Solved
As subject, how to combine two expressions into a single one for this case:
Expression<Func<IEnumerable<T>, IEnumerable<T>>> exp1;
Expression<Func<IEnumerable<T>...
Bimonthly asked 13/8, 2009 at 8:30
3
Solved
I have a method that accepts an Expression<Func<T, bool>> as a parameter. I would like to use it as a predicate in the List.Find() method, but I can't seem to convert it to a Predicate ...
Chloride asked 1/8, 2009 at 23:18
2
Solved
I want to create a query which has more than 3-4 Expression.Or ? But Expression.Or just let me to add two Expressions inside it.
if (!string.IsNullOrEmpty(keyword))
query
.Add(Expression.Or(
Ex...
Eleanoraeleanore asked 12/1, 2009 at 0:51
3
Solved
I'm looking to tokenize Java/Javascript-like expressions in Javascript code. My input will be a string containing the expression, and the output needs to be an array of tokens.
What's the best pra...
Ejective asked 22/5, 2009 at 17:30
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