Rust emits i1 to LLVM for bool and relies on whatever it produces. LLVM uses i8 (one byte) to represent i1 in memory for all the platforms supported by Rust for now. On the other hand, there’s no certainty about the future, since the Rust developers have been refusing to commit to the particular bool … Read more
In which case should you use primitive types(int) or reference types (Integer)? As a rule of thumb, I will use a primitive (such as int) unless I have to use a class that wraps a primitive. One of the cases were one must use a wrapper class such as Integer is in the case of … Read more
I think the best you’d be able to do is use IConvertible as a constraint and do something like: public static operator T +(T x, T y) where T: IConvertible { var type = typeof(T); if (type == typeof(String) || type == typeof(DateTime)) throw new ArgumentException(String.Format(“The type {0} is not supported”, type.FullName), “T”); try { … Read more
String is an object, it isn’t a primitive type at all, just an array of chars. The reason why primitive types exist in Java at all is an interesting one, excerpt from a James Gosling interview: Bill Venners: Why are there primitive types in Java? Why wasn’t everything just an object? James Gosling: Totally an … Read more
This comparision between Java standard collections, Trove and Colt might be helpful.
Yes, it’s valid – it will promote the int to a double before performing the comparison. See JLS section 15.20.1 (Numerical Comparison Operators) which links to JLS section 5.6.2 (Binary Numeric Promotion). From the latter: Widening primitive conversion (ยง5.1.2) is applied to convert either or both operands as specified by the following rules: If either … Read more
In Java, every variable has a type declared in the source code. There are two kinds of types: reference types and primitive types. Reference types are references to objects. Primitive types directly contain values. There are 8 primitive types: byte short int long char float double boolean
NSNumber is a class, not a primitive, and is used when you need to put raw numbers into dictionaries, arrays, or otherwise encapsulate them. NSInteger, NSUInteger, CGFloat, etc are simple types and correspond (on 32-bt systems like the iPhone) to int, unsigned int and float. As a general rule, if you need to store a … Read more
operator[] looks like this: Value& map<Key, Value>::operator[](const Key& key); If you call it with a key that’s not yet in the map, it will default-construct a new instance of Value, put it in the map under key you passed in, and return a reference to it. In this case, you’ve got: map<wstring,int> Scores; Scores[wstrPlayerName]++; Value … Read more