I’m not familiar with Google Protocol Buffers, but my interpretation of the documentation is: use uint32 if the value cannot be negative use sint32 if the value is pretty much as likely to be negative as not (for some fuzzy definition of “as likely to be”) use int32 if the value could be negative, but … Read more
There are three ways in which they’re not safe: long and double aren’t even guaranteed to be updated atomically (you could see half of a write from a different thread) The memory model doesn’t guarantee that you’ll see the latest updates from one thread in another thread, without extra memory barriers of some kind The … Read more
Yep, that’s exactly what it is: the NS* containers can only store objective-C objects, not primitive types. You should be able to accomplish what you want by wrapping it up in an NSNumber: [updated_users replaceObjectAtIndex:index withObject:[NSNumber numberWithBool:YES]] or by using @(YES) which wraps a BOOL in an NSNumber [updated_users replaceObjectAtIndex:index withObject:@(YES)]] You can then pull … Read more
All members defined in your classes have default values, even if you don’t initialize them explicitly, so they do use memory. For example, every int will be initialized by default to 0, and will occupy 4 bytes. For class members : int i; is the same as : int i = 0; Here’s what the … Read more
Here is a simple one-liner: Double[] objects = ArrayUtils.toObject(primitives); You will need to import Apache commons-lang3: import org.apache.commons.lang3.ArrayUtils;
I have rewritten this answer as I was first summing all bytes, this is however incorrect as Java has signed bytes, hence I need to or. Also I have changed the JVM warmup to be correct now. Your best bet really is to simply loop over all values. I suppose you have three major options … Read more
Why does a bool require one byte to store true or false where just one bit is enough Because every object in C++ must be individually addressable* (that is, you must be able to have a pointer to it). You cannot address an individual bit (at least not on conventional hardware). How much safer is … Read more
When working with XNA, everything (even 2d primitives) have to be expressed in a way that a 3d card can understand, which means that a line is just a set of vertices. MSDN has a pretty good walkthrough here: http://msdn.microsoft.com/en-us/library/bb196414.aspx#ID2EEF You’ll find that it takes more code to render a primitive line than it would … Read more
Integer.class is, as you say, a reference to the Class object for the Integer type. int.class is, similarity, a reference to the Class object for the int type. You’re right that this doesn’t sound right; the primitives all have a Class object as a special case. It’s useful for reflection, if you want to tell … Read more
In C, int at least was meant to have the “natural” word size of the CPU and long was probably meant to be the “larger natural” word size (not sure in that last part, but it would also explain why int and long have the same size on x86). Now, my guess is: for int … Read more