I am wondering what the difference is between typeid and typeof in C++. Here’s what I know: typeid is mentioned in the documentation for type_info which is defined in the C++ header file typeinfo. typeof is defined in the GCC extension for C and in the C++ Boost library. Also, here is test code test … Read more
Explain to me what keyof typeof means in TypeScript Example: enum ColorsEnum { white=”#ffffff”, black = ‘#000000’, } type Colors = keyof typeof ColorsEnum; The last row is equivalent to: type Colors = “white” | “black” But how does it work? I would expect typeof ColorsEnum to return something like “Object” and then keyof “Object” … Read more
In C++, how does one find the type of a variable? 10 Answers 10
This question already has answers here: Closed 9 years ago. Possible Duplicate: JavaScript: Check if object is array? Why is an array of objects considered an object, and not an array? For example: $.ajax({ url: ‘http://api.twitter.com/1/statuses/user_timeline.json’, data: { screen_name: ‘mick__romney’}, dataType: ‘jsonp’, success: function(data) { console.dir(data); //Array[20] alert(typeof data); //Object } }); Fiddle 3 Answers … Read more
This question already has answers here: Closed 9 years ago. Possible Duplicate: C# – Is there a better alternative than this to ‘switch on type’? C# doesn’t support switching on the type of an object. What is the best pattern of simulating this: switch (typeof(MyObj)) case Type1: case Type2: case Type3: 5 Answers 5
Is there a better way to get the type of a variable in JS than typeof? It works fine when you do: > typeof 1 “number” > typeof “hello” “string” But it’s useless when you try: > typeof [1,2] “object” >r = new RegExp(/./) /./ > typeof r “function” I know of instanceof, but this … Read more
I have the following code: return “[Inserted new ” + typeof(T).ToString() + “]”; But typeof(T).ToString() returns the full name including namespace Is there anyway to just get the class name (without any namespace qualifiers?) 5 Answers 5
Getting the classname of an object as String using: object_getClassName(myViewController) returns something like this: _TtC5AppName22CalendarViewController I am looking for the pure version: “CalendarViewController”. How do I get a cleaned up string of the class name instead? I found some attempts of questions about this but not an actual answer. Is it not possible at all? … Read more
In my particular case: callback instanceof Function or typeof callback == “function” does it even matter, what’s the difference? Additional Resource: JavaScript-Garden typeof vs instanceof 25 Answers 25 Use instanceof for custom types: var ClassFirst = function () {}; var ClassSecond = function () {}; var instance = new ClassFirst(); typeof instance; // object typeof … Read more
For example: int a = 12; cout << typeof(a) << endl; Expected output: int 23 s 23 C++11 update to a very old question: Print variable type in C++. The accepted (and good) answer is to use typeid(a).name(), where a is a variable name. Now in C++11 we have decltype(x), which can turn an expression … Read more
