Is it ok to use conditional operators like a statement like so? (x == y) ? alert("yo!") : alert("meh!"); Or is it more correct to use it to assign a value like so? z = (x == y) ? "yo!" : "meh!"; If it's not incorrect to use it like a statement, then is it possible to add more than one line of code for execution like so? Is it more ...
In Code Complete 2 (page 601 and 602) there is a table of "Cost of Common Operations". The baseline operation integer assignment is given a value 1 and then the relative time for common operations is listed for Java and C++. For example: C++ Java Integer assignment 1 1...
I know that it's a good idea to make as much of the interface of a class non-member non-friend as possible, and I've just realised that for my 3D vector class, 'Vector3', I can move the +=, -= and so on operators out of the class, leaving just constructors and the copy assignment operator. The question is: what should this operator look...
I once saw this line of code: std::cout %lt;%lt; "Hello world!" %lt;%lt; std:: endl; And am wondering what %lt;%lt; means. ...
Some code for context: class a { } class b { public a a{get;set;} public static implicit operator a(b b) { return b.a; } } a a=null; b b=null; a = b; //compiler: cannot apply operator '==' to operands of type tralala... bool c = a == b; Is it possible to use == operator on different type instanc...
I'm using interface for most of my stuff. I can't find a way to create an overload operator + that would allow me to perform an addition on any objects implementing the IPoint interface Code interface IPoint { double X { get; set; } double Y { get; set; } } class Point : IPoint { double X { get; set; } double Y { ...
Given the Ruby code line = "first_name=mickey;last_name=mouse;country=usa" record = Hash[*line.split(/=|;/)] I understand everything in the second line apart from the * operator - what is it doing and where is the documentation for this? (as you might guess, searching for this case is proving hard...) ...
I have a bot in python that allows the users to evaluate mathematical expressions (via a set of safe functions), but I would like to define my own operator. Does python support such a thing? ...
I'm reading the book "Programming Challenges: The Programming Contest Training Manual" and are implementing a problem where I do not understand the use of operators c>>1 and the comparison if (n&1), someone could help me to know they mean? this is the example code #include <stdio.h> #define MAX_N 300 #define MAX_D 150 long cache[MAX_...
Is it possible to implement the ?? operator in Ruby? a = nil b = 1 x = a ?? b # x should == 1 x = b ?? 2 # x should == 1 ...
Hi all, I was recently trying to gauge my operator overloading/template abilities and as a small test, created the Container class below. While this code compiles fine and works correctly under MSVC 2008 (displays 11), both MinGW/GCC and Comeau choke on the operator+ overload. As I trust them more than MSVC, I'm trying to figure out what...
Hi I just got hung up on this: if ( !(cmd === 'JustifyLeft' || cmd === 'JustifyRight' || cmd === 'JustifyCenter' || cmd === 'JustifyFull') ) (JavaScript) Any suggestions to do it better? thanks ...
While playing with implementing a virtual assignment operator I have ended with a funny behavior. It is not a compiler glitch, since g++ 4.1, 4.3 and VS 2005 share the same behavior. Basically, the virtual operator= behaves differently than any other virtual function with respect to the code that is actually being executed. struct Base...
I have some code using Lucene that leaves the default conjunction operator as OR, and I want to change it to AND. Some of the code just uses a plain QueryParser, and that's fine - I can just call setDefaultOperator on those instances. Unfortunately, in one place the code uses a MultiFieldQueryParser, and calls the static "parse" method...
In C++ it's possible to use a logical operator where a biwise operator was intended: int unmasked = getUnmasked(); //some wide value int masked = unmasked & 0xFF; // izolate lowest 8 bits the second statement could be easily mistyped: int masked = unmasked && 0xFF; //&& used instead of & This will cause incorrect behaviour - masked...
Today while inside a client's production system, I found a SQL Server query that contained an unfamiliar syntax. In the below example, what does the *= operator do? I could not find any mention of it on MSDN. The query does execute and return data. As far as anyone knows, this has been in the system since they were using SQL Server 2...
Hello SO! I am working on a circular problem. In this problem, we have objects that are put on a ring of size MAX, and are assigned IDs from (0 to MAX-1). I have three simple functions to test for range inclusions. inRange(i,j,k) tests if i is in the circular interval [j,k[ (Mnemonic is i inRange(j,k)). And I have the same for ranges ]...
I read in a book that C++ provides additional operators to the usual &,|, and ! which are "and","or" and "not" respectively, plus they come with automatic short circuiting properties where applicable. I would like to use these operators in my code but for some reason the compiler interprets them as identifiers whenever i use them and thr...
I am working on making an expression class: template<typename T, typename U> class expression { public: expression(T vala, U valb, oper o){val1 = vala; val2 = valb; op = o;} operator bool{return(val1 op val2);} private: T val1; U val2; oper op; }; as you can see, this is somewhat pseudocode, because I need an opera...
I have been programming for about 5 years now, and still can't seem to understand, nor remember, what is less than, and what is greater than (< and >, respectively). I tend to debug twice every time I need to use this in a conditional, because I almost never get this right. Any guides to remembering and learning this? ...