casting
Casting to int in awk
Most new awks have an int() function. But the method for casting documented in ‘The Awk Programming Language’ is shown as you do it, by using numericValue and +0. I don’t have the book handy, but I think you can also cast for float value by using +0.0. I hope this helps.
Executing machine code in memory
You need a page with write execute permissions. See mmap(2) and mprotect(2) if you are under unix. You shouldn’t do it using malloc. Also, read what the others said, you can only run raw machine code using your loader. If you try to run an ELF header it will probably segfault all the same. Regarding … Read more
Enum and performance
Casting from int to an enum is extremely cheap… it’ll be faster than a dictionary lookup. Basically it’s a no-op, just copying the bits into a location with a different notional type. Parsing a string into an enum value will be somewhat slower. I doubt that this is going to be a bottleneck for you … Read more
Java correct way convert/cast object to Double
new Double(object.toString()); But it seems weird to me that you’re going from an Object to a Double. You should have a better idea what class of object you’re starting with before attempting a conversion. You might have a bit of a code quality problem there. Note that this is a conversion, not casting.
Is there any runtime cost for Casting in Java?
Well, the compiled code probably includes the cast twice in the second case – so in theory it’s doing the same work twice. However, it’s very possible that a smart JIT will work out that you’re doing the same cast on the same value, so it can cache the result. But it is having to … Read more
How does implicit conversion work in Java?
Explanation Let’s take a look at your code and some modified examples: // Example 1 byte byteValue = 2; // Example 2 byte byteValue = 4/2; // Example 3 byte byteValue = 2000; // Example 4 byte byteValue = 500/2; // Example 5 int n1 = 4; byte byteValue = n1/2; Non-lossy conversion You will … Read more
What is the correct way to convert 2 bytes to a signed 16-bit integer?
If int is 16-bit then your version relies on implementation-defined behaviour if the value of the expression in the return statement is out of range for int16_t. However the first version also has a similar problem; for example if int32_t is a typedef for int, and the input bytes are both 0xFF, then the result … Read more
Casting an object to a generic interface
If I understand the question, then the most common approach would be to declare a non-generic base-interface, i.e. internal interface IRelativeTo { object getRelativeTo(); // or maybe something else non-generic void setRelativeTo(object relativeTo); } internal interface IRelativeTo<T> : IRelativeTo where T : IObject { new T getRelativeTo(); new void setRelativeTo(T relativeTo); } Another option is … Read more
Flow: Create a flow type by extending another type
What you’re looking for is the intersection type. According to the documentation: An intersection type requires a value to be all of the input types. Syntax: Intersection: < type 1 > & < type 2 > … & < type n > The intersection type is intended to extend an existing type and add additional … Read more