a is of type [i32; 3]; an array of three i32s. [i32; 3] does not implement an iter method, but it does dereference into &[i32]. &[i32] implements an iter method which produces an iterator. This iterator implements Iterator<Item=&i32>. It uses &i32 rather than i32 because the iterator has to work on arrays of any type, … Read more
1. Is getA1() implementation correct ? I feel it is incorrect as it is returning address of local variable or temporary. The only version of getAx() that is correct in your program is getA3(). Both of the others have undefined behaviour no matter how you use them later. 2. Which of the statements in main … Read more
Any typo in configuration xml can be a cause. Loader just can’t see your configuration. I also had a hour of headache until I realize that the error was in character “=” instead of “-” in schema name: <assemblyBinding xmlns=”urn:schemas=microsoft-com:asm.v1″> Just check carefully all attribute names and values. I guess “PublicKeyToken” should be “publicKeyToken” This … Read more
There are 3 types of const pointers: //Data that p points to cannot be changed from p const char* p = szBuffer; //p cannot point to something different. char* const p = szBuffer; //Both of the above restrictions apply on p const char* const p = szBuffer; Method #2 above is most similar to a … Read more
The clearest answer. Does “X& const x” make any sense? No, it is nonsense To find out what the above declaration means, read it right-to-left: “x is a const reference to a X”. But that is redundant — references are always const, in the sense that you can never reseat a reference to make it … Read more
I used PhantomReferences in a simplistic, very specialized kind of memory profiler to monitor object creation and destruction. I needed them to keep track of destruction. But the approach is out-dated. (It was written in 2004 targeting J2SE 1.4.) Professional profiling tools are much more powerful and reliable and the newer Java 5 features like … Read more
Check your build types of each project under project properties – I bet one or the other will be set to build against .NET XX – Client Profile. With inconsistent versions, specifically with one being Client Profile and the other not, then it works at design time but fails at compile time. A real gotcha. … Read more
First of all String.toString is a no-op: /** * This object (which is already a string!) is itself returned. * * @return the string itself. */ public String toString() { return this; } Second of all, String constants are interned so s1 and s2 are behind the scenes changed to be the same String instance.
Is a bicycle an idiomatic way to get from one city to another? Like most things in software (and life), it depends. If your type implements Copy I’d prefer these in this order: some_iter.copied() some_iter.cloned() some_iter.map(|&v| v) some_iter.map(|v| *v) some_iter.map(Clone::clone) some_iter.map(|v| v.clone()) If your type implements Clone I’d prefer these in this order: some_iter.cloned() some_iter.map(Clone::clone) … Read more
Not possible. JS passes objects by a copy of the reference, so in the step var ref = obj1 you’re not actually assigning a reference pointer like you would in a language like C. Instead you’re creating a copy of a reference that points to an object that looks like {x: ‘a’}. See this answer … Read more