iterator

来源： https://stackoverflow.com/questions/21777745/finding-the-key-of-hashmap-which-holds-the-lowest-integer-value

来源： https://stackoverflow.com/questions/40516692/why-dont-we-implement-all-the-functions-from-iterator-to-implement-an-iterator

来源： https://stackoverflow.com/questions/33411326/why-const-iterator-does-not-provide-a-base-like-reverse-iterator

来源： https://stackoverflow.com/questions/40516692/why-dont-we-implement-all-the-functions-from-iterator-to-implement-an-iterator

来源： https://stackoverflow.com/questions/15015452/is-there-any-single-function-to-print-an-iterables-values

来源： https://stackoverflow.com/questions/58807420/how-to-create-a-list-of-valid-csv-records-by-logging-the-error-of-invalid-record

问题 Hi I have a program that deals alot with vectors and indexes of the elements of these vectors, and I was wondering: is there a difference between uint and unsigned int which is better to use one of the above types or just use int as I read some people say compiler does handle int values more efficiently, but if I used int I will have to check always for negative idxs which is pain. do you think iterators to be better? is it more efficient than normal indexing vectorx[idx] ? p.s the software

问题 Hi I have a program that deals alot with vectors and indexes of the elements of these vectors, and I was wondering: is there a difference between uint and unsigned int which is better to use one of the above types or just use int as I read some people say compiler does handle int values more efficiently, but if I used int I will have to check always for negative idxs which is pain. do you think iterators to be better? is it more efficient than normal indexing vectorx[idx] ? p.s the software

问题 Why does a class need to define __iter__() returning self, to get an iterator of the class? class MyClass: def __init__(self): self.state = 0 def __next__(self): self.state += 1 if self.state > 4: raise StopIteration return self.state myObj = MyClass() for i in myObj: print(i) Console log: Traceback (most recent call last): for i in myObj: TypeError: 'MyClass' object is not iterable the answer https://stackoverflow.com/a/9884259/4515198, says An iterator is an object with a next (Python 2) or

问题 I am reading the Rust 101 tutorial, where the author talks about shared borrowing with the example of a Vec object passed to a function. Below is a slightly adapted MWE of what the the tutorial is teaching. The interesting part is v.iter() in vec_min . The author writes: This time, we explicitly request an iterator for the vector v . The method iter borrows the vector it works on, and provides shared borrows of the elements. But what happens if I use a for ... in ... construction on an object