binary-operators

C++ Binary operators order of precedence

In what order are the following parameters tested (in C++)? if (a || b && c) { } I've just seen this code in our application and I hate it, I want to add some brackets to just clarify the ordering. But I don't want to add the brackets until I know I'm adding them in the right place. Edit: Accepted Answer & Follow Up This link has mo...

Absolute Beginner's Guide to Bit Shifting?

I've been attempting to learn C in my spare time, and other languages (C#, Java, etc.) have the same concept (and often the same operators) ... What I'm wondering is, at a core level, what does bit-shifting (<<, >>, >>>) do, what problems can it help solve, and what gotchas lurk around the bend? In other words, an absolute beginner's g...

Why does this bitwise shift-right appear not to work?

Could someone explain to me why the mask is not shifted to the right at all? You can use anything in place of that 1 and the result will be the same. unsigned mask = ~0 >> 1; printf("%u\n", mask); ...

c++ multiple enums in one function argument using bitwise or "|"

Hi, I recently came across some functions where you can pass multiple enums like this: myFunction(One | Two); Since I think this is a really elegant way I tried to implement something like that myself: void myFunction(int _a){ switch(_a){ case One: cout<<"!!!!"<<endl; break; case Two: cout<<"?????"<<e...

Will (variable or {}) work crossbrowser in Javascript?

The if(variable) clause in the following constructs checks if list/array is not null/undefined, to avoid an exception: if (list) for (var k in list) { ... if (array) for (var i = array.length; i >= 0; i--) { ... But JS syntax allows expressions like null || [] undefined || {} So I can make code shorter by on...

How can I write custom comparison (definition for binary operator Equal) for entityframework object to an int?

I'm getting this error: ex = {"The binary operator Equal is not defined for the types 'MySite.Domain.DomainModel.EntityFramework.NickName' and 'System.Int32'."} What I tried to do was do a select all where the NickNameId = someIntPassedIn... the problem is that the NickNameId is a foreign key, so when it compares the someIntPassedI...

preprocessor macros i don't understand

i'm currently looking through some source code i found on the net, which makes use of preprocessor macros in a way i don't understand. it implements the quad-edge data-structure. hope, someone can clear things for me! typedef int edge_ref; typedef struct { edge_ref next[4]; void *data[4]; unsigned mark; } edge_struct; #def...