For (non-nullable) object types, Kotlin uses the null value to mark that a lateinit property has not been initialized and to throw the appropriate exception when the property is accessed. For primitive types, there is no such value, so there is no way to mark a property as non-initialized and to provide the diagnostics that … Read more
In the first case, you have a widening conversion happening. This can be see when runinng the “javap” utility program (included w/ the JDK), on the compiled class: public static void main(java.lang.String[]); Code: 0: iconst_ 5 1: istore_ 1 2: iload_ 1 3: i2l 4: invokestatic #6; //Method hello:(J)V 7: return } Clearly, you see … Read more
Async prefix is a kind of wrapper for Promises. async function latestTime() { const bl = await web3.eth.getBlock(‘latest’); console.log(bl.timestamp); // Returns a primitive console.log(typeof bl.timestamp.then == ‘function’); //Returns false – not a promise return bl.timestamp; } Is the same as function latestTime() { return new Promise(function(resolve,success){ const bl = web3.eth.getBlock(‘latest’); bl.then(function(result){ console.log(result.timestamp); // Returns a … Read more
No. The C# specification rigidly defines that int is an alias for System.Int32 with exactly 32 bits. Changing this would be a major breaking change.
It’s been awhile since this question has been asked but I ran into this issue myself and couldn’t find a solution anywhere. OCMock now supports ignoringNonObjectArgs so an example of an expect would be [[[mockObject expect] ignoringNonObjectArgs] someMethodWithPrimitiveArgument:5]; the 5 doesn’t actually do anything, just a filler value
A primitive is a data type that is composed of no other data types and can not be broken down any further. It is like the atoms in the programming scenario. I say atom because atom is a basic unit of matter and there is nothing that can be derived from it. I mean, an … Read more
In Java primitives aren’t objects, so you can’t use them in place of objects. However Java will automatically box/unbox primitives (aka autoboxing) into objects so you can do things like: List<Integer> intList = new LinkedList<Integer>(); intList.add(1); intList.add(new Integer(2)); … Integer first = intList.get(0); int second = intList.get(1); But this is really just the compiler automatically … Read more
I tend to use a “super type” like long or double if I still want a primitive. The performance is usually very close and it avoids creating lots of variations. BTW: registers in a 64-bit JVM will all be 64-bit anyway.
For the hashCode of an int the most natural choice is to use the int itself. A better question is what to use for the hashCode of a long since it doesn’t fit into the int-sized hashcode. Generally, your best source for that—and all hashCode-related questions—would be Effective Java. Here’s what Effective Java recommends (and … Read more
y is getting sign-extended in the first snippet, which would overwrite x with -1 whenever y < 0. In the second snippet, the cast to int is done before the shift, so x actually gets the value of y. long l = (((long)x) << 32) | (y & 0xffffffffL); int x = (int)(l >> 32); … Read more