A button may be always clicked programmatically. For example you may have a page with a form like this: <form> <input type=”text” /> <button>Do something</button> <input type=”submit”> </form> then it is possible just to open debug console and type document.getElementsByTagName(‘button’)[0].click(); which will click the button, or document.getElementsByTagName(‘input’)[1].click(); which will click the submit button of the … Read more
I had this problem when I did a global replace of NSLog with DLog. I foolishly included the #define DLog(…) NSLog(… statements, so I ended up with #define DLog(…) DLog(… which caused the warnings, and a linker error.
You can use the “Find and Replace” feature of Visual Studio to delete matching lines. The key is to match the whole line including the end of line character as well. You can do this in wildcard or regular expression mode. In wildcard mode, begin the expression with * and end the expression with *\n. … Read more
Currently this is not supported in stable. However there is a feature in nightly called concat_idents: concat_idents!(my_test_, $id) See Rust docs Issue Update: it seems there aren’t near-term plans to add this into stable releases, see issue.
There is no way to use // comments in a macro except the last line of the macro. As Paul R suggests, the /* comment */ does work and seems to be the only option: #define SOME_BIG_MACRO(input)\ SOME_FUNCTION_CALL() /* this does… */ \ SOME_OTHER_FUNCTION_CALL() The reason is the following. Standard for Programming Language C ++ … Read more
First of all Lisp has first-class functions too, so you could as well ask: “Why do I need macros in Lisp if I already have first-class functions”. The answer to that is that first-class functions don’t allow you to play with syntax. On a cosmetic level, first-class functions allow you to write f(filename, some_function) or … Read more
Use the same idea, where the type of a ?: expression depends on whether an argument is a null pointer constant or an ordinary void *, but detect the type with _Generic: #define ICE_P(x) _Generic((1? (void *) ((x)*0) : (int *) 0), int*: 1, void*: 0) Demo on Ideone. _Generic is a C11 addition, so … Read more
Using C++11, the non-macro form is: char arrname[5]; size_t count = std::extent< decltype( arrname ) >::value; And extent can be found in the type_traits header. Or if you want it to look a bit nicer, wrap it in this: template < typename T, size_t N > size_t countof( T ( & arr )[ N ] … Read more
A lot of things previously defined in package scala.reflect.mirror have moved to scala.reflect.runtime.universe: scala> import scala.reflect.runtime.{universe => u} import scala.reflect.runtime.{universe=>u} scala> val expr = u reify { 1 to 3 map (_+1) } expr: reflect.runtime.universe.Expr[scala.collection.immutable.IndexedSeq[Int]] = Expr[scala.collection.immutable.IndexedSeq[Int]](scala.this.Predef.intWrapper(1).to(3).map(((x$1) => x$1.$plus(1)))(immutable.this.IndexedSeq.canBuildFrom)) scala> u show expr.tree res57: String = scala.this.Predef.intWrapper(1).to(3).map(((x$1) => x$1.$plus(1)))(immutable.this.IndexedSeq.canBuildFrom) scala> u showRaw expr.tree res58: String … Read more
Another way to write your code uses chained #elif directives: #if choice == 3 … #elif choice == 4 … #else #error Unsupported choice setting #endif Note that if choice is not #defined, the compiler (preprocessor) treats it as having the value 0.