Yes: if (typeof(T) == typeof(MyClass)) { MyClass mc = (MyClass)(object) t; } else if (typeof(T) == typeof(List<MyClass>)) { List<MyClass> lmc = (List<MyClass>)(object) t; } It’s slightly odd that you need to go via a cast to object, but that’s just the way that generics work – there aren’t as many conversions from a generic type … Read more
I upvoted Matt Joiner’s answer, but wanted to include some additional observations to make it clear that, along with a couple of other factors, there are 4 times that matter when choosing between pre-checking conditions (known as LBYL or “Look Before You Leap”) and just handling exceptions (known as EAFP or “Easier to Ask Forgiveness … Read more
Simplest way I can think of: # checking whether foo is a boolean !!foo == foo
Theoretical part This is an architectural peculiarity of scalac that started leaking into the public API once we exposed internal compiler data structures in compile-time / runtime reflection in 2.10. Very roughly speaking, scalac’s frontend consists of a parser and a typer, both of which work with trees and produce trees as their result. However … Read more
Use isinstance(). Sample: if isinstance(n, unicode): # do this elif isinstance(n, Node): # do that …
If you want to check against a specific type you can do the following: if let stringArray = obj as? [String] { // obj is a string array. Do something with stringArray } else { // obj is not a string array } You can use “as!” and that will throw a runtime error if … Read more
4.19.4 The instanceof operator The instanceof operator requires the left operand to be of type Any, an object type, or a type parameter type, and the right operand to be of type Any or a subtype of the ‘Function’ interface type. The result is always of the Boolean primitive type. So you could use mySprite … Read more
Yes, you can. MySQL supports regex (http://dev.mysql.com/doc/refman/5.6/en/regexp.html) and for data validation you should use a trigger since MySQL doesn’t support CHECK constraint (you can always move to PostgreSQL as an alternative:). NB! Be aware that even though MySQL does have CHECK constraint construct, unfortunately MySQL (so far 5.6) does not validate data against check constraints. … Read more
Your taste may vary, but the Pythonic(tm) style is to just go ahead and use objects as you need to. If they don’t support the operations you’re attempting, an exception will be raised. This is known as duck typing. There are a few reasons for favoring this style: first, it enables polymorphism by allowing you … Read more
PEP 0484 – Type Hints – The problem of forward declarations addresses the issue: The problem with type hints is that annotations (per PEP 3107 , and similar to default values) are evaluated at the time a function is defined, and thus any names used in an annotation must be already defined when the function … Read more