F# allows to use checked arithmetics by opening Checked module, which redefines standard operators to be checked operators, for example: open Checked let x = 1 + System.Int32.MaxValue // overflow will result arithmetic overflow exception. But what if I want to use checked arithmetics in some small scope, like C# allows with keyword c...
I've inherited a large Visual Studio 6 C++ project that needs to be translated for VS2005. Some of the classes defined operator< and operator[], but don't specify return types in the declarations. VS6 allows this, but not VS2005. I am aware that the C standard specifies that the default return type for normal functions is int, and I ass...
Is this an operator? I can't find it here. What does the part "$_POST as $response_id => $response" in the following code means? // If the questionnaire form has been submitted, write the form responses to the database if (isset($_POST['submit'])) { // Write the questionnaire response rows to the response table foreach ($_P...
Possible ways: Using push: my @list; push @list, 'foo' if $foo; push @list, 'bar' if $bar; Using the conditional operator: my @list = ( $foo ? 'foo' : (), $bar ? 'bar' : (), ); Using the x!! Boolean list squash operator: my @list = ( ('foo') x!! $foo, ('bar') x!! $bar, ); Wh...
Say, I have a class: class M { public int val; And also a + operator inside it: public static M operator +(M a, M b) { M c = new M(); c.val = a.val + b.val; return c; } } And I've got a List of the objects of the class: List<M> ms = new List(); M obj = new M(); obj.val = 5; ms.Add(obj); ...
I want to do something like this class SomeClass<T> { SomeClass() { bool IsInterface = T is ISomeInterface; } } What is the best way to something like this? Note: I am not looking to constrain T with a where, but I would like my code to be aware of what types of interfaces T implements. I would prefer that I dont hav...
int x = 10; x += x--; In C#/.Net, why does it equal what it equals? (I'm purposely leaving the answer out so you can guess and see if you're right) ...
Possible Duplicate: Is it possible to create a new operator in c#? I love C#, but one thing I wish it had was the ability to define my own operators on classes, like A => B instead of having to do A.Implies(B). I think it would be really cool if you could assign an identifier of any length in a set like [+-*/&^|%$#@><]+ to a c...
I think if I understand correctly, a <> b is the exact same thing functionally as a != b, and in Python not a == b, but is there reason to use <> over the other versions? I know a common mistake for Python newcomers is to think that not a is b is the same as a != b or not a == b. Do similar misconceptions occur with <>, or is it exactl...
When defining a custom operator from the limited set of single-character operators that can be both infix and prefix operators (+ - % &) I decided to use the ampersand, since it's the only one of those operators that I have not so far had occasion to use in my F# code. I reasoned that since & seems to have fairly limited use in F#, redef...
I've never used the >> and << operators, not because I've never needed them, but because I don't know if I could have used them, or where I should have. 100 >> 3 outputs 12 instead of 12.5. Why is this. Perhaps learning where to best use right shift will answer that implicitly, but I'm curious. ...
I'm trying to do the following operation: R3MeshHalfEdge *tmp_edge = half_edge; R3Vector *tmp_vector = new R3Vector(R3zero_vector); do { **tmp_vector += tmp_edge->face->plane.Normal();** tmp_edge = tmp_edge->opposite->next; }while(tmp_edge != half_edge); However, the compiler gives me the following error: R3Mesh.cp...
I have been searching for a bit but can not locate any examples that demonstrate the usage of @_* while pattern matching case classes. Below is an example of the kind of application I am referring to. def findPerimeter(o: SomeObject): Perimeter = o match { case Type1(length, width) => new Perimeter(0, 0, length, width) case Type2(rad...
I have the following class which is part of a statictical analysis package. The MetricKey object is used as a dictionary key. Decision, MetricUnit & Portfolio are all enums. I had to override the equality operator (==) to get dictionary key matching working. I used the guidance at http://msdn.microsoft.com/en-us/library/ms173147.aspx...
What is the correct name for operator *, as in function(*args)? unpack, unzip, something else? ...
I guess I just got used to saying things like: x++ in PHP and Java land. But when I tried this in my Rails code it had a fit: compile error /users/gshankar/projects/naplan/app/views/answers/new.html.haml:19: syntax error, unexpected ';' /users/gshankar/projects/naplan/app/views/answers/new.html.haml:23: syntax error, unexpected kENSU...
While reading the Android guide to Notifications, I stumbled accross this: Adding vibration You can alert the user with the the default vibration pattern or with a vibration pattern defined by your application. To use the default pattern, add "DEFAULT_VIBRATE" to the defaults field: notification.defaults |= Notif...
can somebody explain me why it's possible to do: String s = "foo"; how is this possible without operator overloading (in that case the "=") I'm from a C++ background so that explains... ...
What would be the most elegant way too fix the following code: #include <vector> #include <map> #include <set> using namespace std; typedef map< int, int > row_t; typedef vector< row_t > board_t; typedef row_t::iterator area_t; bool operator< ( area_t const& a, area_t const& b ) { return( a->first < b->first ); }; int main( int a...
Ok, I am working through a book and trying to learn C++ operator overloading. I created a BigInt class that takes a single int (initially set to 0) for the constructor. I overloaded the += method and it works just fine in the following code: BigInt x = BigInt(2); x += x; x.print( cout ); The code will output 4. So, then I was working ...