I want to know why the comparison works when if but not using match. It’s not so much about if and more because you’ve used == in the condition. The condition in an if statement is any expression of type bool; you just happen to have chosen to use == there. The == operator is … Read more
There is no Objective-C literal syntax for NSSet. It doesn’t really make sense to use index subscripting to access NSSet elements, although key-based subscripting might. Either by wrapping or subclassing, you could add your own. (Correction): Originally I had thought NSOrderedSet wasn’t supported either, but it turns out that using index subscripting is supported, but … Read more
According to Rationale for International Standard – Programming Languages C ยง6.4.4.1 Integer constants A proposal to add binary constants was rejected due to lack of precedent and insufficient utility. It’s not in standard C, but GCC supports it as an extension, prefixed by 0b or 0B: i = 0b101010; See here for detail.
It makes it easier to pick out values in a memory dump. Example: enum state { waiting, running, stopped }; vs. enum state { waiting = ‘wait’, running = ‘run.’, stopped = ‘stop’ }; a memory dump after the following statement: s = stopped; might look like: 00 00 00 02 . . . . … Read more
You can do that with literal types. from typing_extensions import Literal # from typing import Literal # Python 3.8 or higher def fun(b: int) -> Literal[“a”, “b”, “c”]: if b == 0: return “a” if b == 1: return “b” return “d” mypy is able to detect the return “d” as a invalid statement: error: … Read more
As the other answered already said, byte is a signed type in Java. The range is from -128 to 127 inclusive. So 0xff is equal to -0x01. You can use 0xff instead of -0x01 if you add a manual cast: byte[] rawbytes={0xa, 0x2, (byte) 0xff};
The strings that you enter: “red”, “organge” etc are “literal”, because they are defined inside the program code itself (they are not read directly from disk, user input /stdin etc.). This means that if at any point you try to write to your colors you will be directly accessing your original input and thus editing … Read more
Dim strings() As String = {“abc”, “def”, “ghi”}
What you’re talking about (I think) are called docstrings (Thanks Boud for the link). def foo(): “””This function does absolutely nothing””” Now, if you type help(foo) from the interpreter, you’ll get to see the string that I put in the function. You can also access that string by foo.__doc__ Of course, string literals are just … Read more
GCC is only following the standard. #877: “Each […] hexadecimal escape sequence is the longest sequence of characters that can constitute the escape sequence.”