null assignments do not change value by globally destroying that object. That kind of behavior would lead to hard-to-track bugs and counterintuitive behavior. They only break that specific reference. For simplicity, let’s say that sample points to address 12345. This is probably not the address, and is only used to make things simple here. The … Read more
If you don’t want to change anything in your php.ini file, according to PHP documentation, you can do this. error_log(“Error message\n”, 3, “/mypath/php.log”); The first parameter is the string to be sent to the log. The second parameter 3 means expect a file destination. The third parameter is the log file path.
That is taking the parameter by reference. So in the first case you are taking a pointer parameter by reference so whatever modification you do to the value of the pointer is reflected outside the function. Second is the simlilar to first one with the only difference being that it is a double pointer. See … Read more
You can address it like this: =INDIRECT(ADDRESS(ROW()-1,COLUMN())) COLUMN() returns a numeric reference to the current column ROW() returns a numeric reference to the current row. In the example here, subtracting 1 from the row gives you the previous row. This math can be applied to the ROW() and/or the COLUMN(), but in answering your question, … Read more
I have seen errors on standard functions if there was a reference to a totally different library missing. In the VBA editor launch the Compile command from the menu and then check the References dialog to see if there is anything missing and if so try to add these libraries. In general it seems to … Read more
You need to initliaze it. But if you would like to conditionally initialize it, you can do something like this: MyObject& ref = (condition) ? MyObject([something]) : MyObject([something else]);
You can use such trick: myObject = new ArrayList<Object>(myTempObject); or use myObject = (ArrayList<Object>)myTempObject.clone(); You can get some information about clone() method here But you should remember, that all these ways will give you a copy of your List, not all of its elements. So if you change one of the elements in your copied … Read more
The reference is passed by value. Arrays in .NET are object on the heap, so you have a reference. That reference is passed by value, meaning that changes to the contents of the array will be seen by the caller, but reassigning the array won’t: void Foo(int[] data) { data[0] = 1; // caller sees … Read more
There is a slight, yet extremely important, distinction between a pointer and a reference. A pointer points to a place in memory while a reference points to an object in memory. Pointers are not “type safe” in the sense that you cannot guarantee the correctness of the memory they point at. Take for example the … 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