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• Conditional operator in Mako using Pylons

  - by Antoine Leclair

  In PHP, I often use the conditional operator to add an attribute to an html element if it applies to the element in question. For example: <select name="blah"> <option value="1"<?= $blah == 1 ? ' selected="selected"' : '' ?>> One </option> <option value="2"<?= $blah == 2 ? ' selected="selected"' :…

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• Efficiency of manually written loops vs operator overloads (C++)

  - by Sagekilla

  Hi all, in the program I'm working on I have 3-element arrays, which I use as mathematical vectors for all intents and purposes. Through the course of writing my code, I was tempted to just roll my own Vector class with simple +, -, *, /, etc overloads so I can simplify statements like: for (int i = 0; i < 3; i++) r[i] = r1[i] - r2[i]; …

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• Pair equal operator overloading for inserting into set

  - by Petwoip

  I am trying to add a pair<int,int> to a set. If a pair shares the same two values as another in the set, it should not be inserted. Here's my non-working code: typedef std::pair<int, int> PairInt; template<> bool std::operator==(const PairInt& l, const PairInt& r) { return (l.first == r.first && l.second…

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• C++ OOP - Can you 'overload a cast' <- hard to explain in 1 sentence

  - by Brandon Miller

  Well, the WinAPI has a POINT struct, but I am trying to make an alternative class to this so you can set the values of x and y from a constructor. /** * X-Y coordinates */ class Point { public: int X, Y; Point(void) : X(0), Y(0) {} Point(int x, int y) : X(x), Y(y) {} Point(const POINT& pt) :…

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• ASX: Just Another Stock Market Operator

  - by Theresa Hickman

  I try to stay informed with what's happening in global financial markets since we all know they are all interconnected. Last week, on Mar. 11 2010, Australia's Senate passed a law that reduced Australia's stock market's role to just a stock market operator. Before this, ASX (Australian Stock Exchange) acted as both its own regulator and…

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• Nullable types and ?? operator C# [en-US]

  - by ruimachado

  Nullable types vs Non-nullable types   While developing our C# projects its frequent the null comparison operation to avoid null exceptions. This simple operation is mainly coded using the "var x = null" code example inside an if clause. However not all types of variables are nullable, which means that setting a variable to null…

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• C# ?? null coalescing operator

  - by anirudha

  the null coalescing operator is used for set the value when object is null. if object have some value that nothing change and still have their default value they have.  string str = "i am string";            string message = str ?? "it is null";   the message have same…

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• Why is overloading operator&() prohibited for classes stored in STL containers?

  - by sharptooth

  Suddenly in this article ("problem 2") I see a statement that C++ Standard prohibits using STL containers for storing elemants of class if that class has an overloaded operator&(). Having overloaded operator&() can indeed be problematic, but looks like a default "address-of" operator can be used easily through a set of…

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• Take,Skip and Reverse Operator in Linq

  - by Jalpesh P. Vadgama

  I have found three more new operators in Linq which is use full in day to day programming stuff. Take,Skip and Reverse. Here are explanation of operators how it works. Take Operator: Take operator will return first N number of element from entities. Skip Operator: Skip operator will skip N number of element from entities and…

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• Operator of the week - Assert

  - by Fabiano Amorim

  Well my friends, I was wondering how to help you in a practical way to understand execution plans. So I think I'll talk about the Showplan Operators. Showplan Operators are used by the Query Optimizer (QO) to build the query plan in order to perform a specified operation. A query plan will consist of many physical operators.…

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• C++ streams operator << and manipulators / formatters

  - by Ayman

  First, most of my recent work was Java. So even though I "know" C++, I do not want to write Java in C++. And C++ templates are one thing I will really miss when going back to Java. Now that this out of the way, if I want to do create a new stream formatter, say pic, that will have a single std::string parameter in it's…

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• OR Operator in c#

  - by Saif Khan

  Can I achieve if(a == "b" || "c") instead of if(a == "b" || a== "c")

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• Ternary operator in C

  - by user265260

  can every if...then...else statement be converted into an equivalent statement using only ?:

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• SQL Logic Operator Precedence: And and Or

  - by nc

  Are the two statements below equivalent? SELECT [...] FROM [...] WHERE some_col in (1,2,3,4,5) AND some_other_expr and SELECT [...] FROM [...] WHERE some_col in (1,2,3) or some_col in (4,5) AND some_other_expr Is there some sort of truth table I could use to verify this? Thanks.

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• Like operator in sql server

  - by Geetha

  Hi All, i want to get all the record from the database which contain atleast one word from the input string. Ex: input=Stack over flow select * from sample where name like '%stack%' or name like '%over% or name like '%flow%' Geetha.

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• Conditional operator in C

  - by user265260

  can every if...then...else statement be converted into an equivalent statement using only ?:

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• Why doesn't the conditional operator correctly allow the use of "null" for assignment to nullable ty

  - by Daniel Coffman

  This will not compile, stating "Type of conditional expression cannot be determined because there is no implicit conversion between 'System.DateTime' and ''" task.ActualEndDate = TextBoxActualEndDate.Text != "" ? DateTime.Parse(TextBoxActualEndDate.Text) : null; This works just fine if (TextBoxActualEndDate.Text != "") …

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• Linq2SQL to produce Like operator

  - by Dante

  Hi, I have a string "Word1 Word2" and I want to transform it to a query such as "Like '%Word1%Word2%'". At the moment I have: from t in Test where t.Field.Contains("Word1 Word2") How to do this in LINQ2SQL? Do I need to create two separate queries for this, can't I write it in the same statement? Thx in advance

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• std::map operator[] and automatically created new objects

  - by thomas-gies

  I'm a little bit scared about something like this: std::map<DWORD, DWORD> tmap; tmap[0]+=1; tmap[0]+=1; tmap[0]+=1; Since DWORD's are not automatically initialized, I'm always afraid of tmap[0] being a random number that is incremented. How does the map know hot to initialize a DWORD if the runtime does not…

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• struct assignment operator on arrays

  - by Django fan

  Suppose I defined a structure like this: struct person { char name [10]; int age; }; and declared two person variables: person Bob; person John; where Bob.name = "Bob", Bob.age = 30 and John.name = "John",John.age = 25. and I called Bob = John; struct person would do a Memberwise assignment and assign…

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• LIKE operator with $variable

  - by skarama

  This is my first question here and I hope it is simple enough to get a quick answer! Basically, I have the following code: $variable = curPageURL(); $query = 'SELECT * FROM `tablename` WHERE `columnname` LIKE '$variable' ; If I echo the $variable, it prints the current page's url( which is a javascript on my page) …

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• Conditional operator in if-statement?

  - by Pindatjuh

  I've written the following if-statement in Java: if(methodName.equals("set" + this.name) || isBoolean() ? methodName.equals("is" + this.name) : methodName.equals("get" + this.name)) { ... } Is this a good practice to write such expressions in if, to separate state from condition? And can…

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• In C# why can't a conditional operator implicitly cast to a nullable type

  - by Tim Jarvis

  I am curious as to why an implicit cast fails in... int? someValue = SomeCondition ? ResultOfSomeCalc() : null; and why I have to perform an explicit cast instead int? someValue = SomeCondition ? ResultofSomeCalc() : (int?)null; It seems to me that the compiler has all the information it need to make an…

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• Ternary operator in if-statement?

  - by Pindatjuh

  I've written the following if-statement in Java: if(methodName.equals("set" + this.name) || isBoolean() ? methodName.equals("is" + this.name) : methodName.equals("get" + this.name)) { ... } Is this a good practice to write such expressions in if, to separate state from condition?…

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• How do I use the conditional operator?

  - by Jeremy Rudd

  I've always wondered how to write the "A ? B : C" syntax in a C++ compatible language. I think it works something like: (Pseudo code) If A > B C = A Else C = B Will any veteran C++ programmer please help me out?

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