function

问题 I read that the extern keyword is implicit in the context of functions, so unless you specify otherwise using the static keyword ( which if I'm not mistaken is basically a completely separate concept from the static that variables employ—they just share a keyword ), they are visible to all object files. This makes sense; having the declarations be implicitly external, while technically unnecessary when the declarations are in the same file as the definition, is useful because the programmer

问题 I read that the extern keyword is implicit in the context of functions, so unless you specify otherwise using the static keyword ( which if I'm not mistaken is basically a completely separate concept from the static that variables employ—they just share a keyword ), they are visible to all object files. This makes sense; having the declarations be implicitly external, while technically unnecessary when the declarations are in the same file as the definition, is useful because the programmer

问题 I am adding a URL handler to a Flask application using add_url_rule. It requires a function as a handler (not a method). However, for proper encapsulation, my intended function is a bound method that uses the self variable. Is there any way I can somehow make Flask see my function: def action(self, param) as def action(param) ? class A(): def __init__(self): self._localvar = 5 self._flask = Flask("testapp") def add_rules(self): self._flask.add_url_rule("/","root",????) def action(self, value)

问题 For most of my code in my userscript, I'm need to use unsafeWindow for the websites my script executes on. I do this by using // @grant unsafeWindow . However, some of my code cannot be executed with unsafeWindow and needs to run in Tampermonkey's isolated sandbox. How would I be able to do this? Something like this could work: function disableUnsafeWindow() { // Disable UnsafeWindow } function enableUnsafeWindow() { // Enable unsafeWindow } function withUnsafeWindow() { enableUnsafeWindow()

问题 I'm trying to replicate solution on applying multiple functions in sapply posted on R-Bloggers but I can't get it to work in the desired manner. I'm working with a simple data set, similar to the one generated below: require(datasets) crs_mat <- cor(mtcars) # Triangle function get_upper_tri <- function(cormat){ cormat[lower.tri(cormat)] <- NA return(cormat) } require(reshape2) crs_mat <- melt(get_upper_tri(crs_mat)) I would like to replace some text values across columns Var1 and Var2 . The

问题 I have a function that accepts a parameter that has some generic type public < T extends SomeA > String foo(T t) {...} Now... SomeA contains a series of methods that can be called, like baz1() , baz2() , baz3() , etc... Now, here's the rub The variable T that will be passed into foo(T t) will be an instance of either SomeB or SomeC , where SomeB extends SomeA and SomeC extends someA . Both SomeB and SomeC contains a method glop(...) which returns SomeD , however , glop(...) is not in SomeA .

问题 i need a T-SQL function that remove duplicate charcters in a give String for exemple Fn_Remove('AVGHAHA') it will returns AVGH 回答1: Using NGrams8K, you can split the string into individual character "tokens", apply a number to that character set, and then rebuild with only the first of each character: WITH CTE AS( SELECT V.S, N.position, N.token, ROW_NUMBER() OVER (PARTITION BY N.token ORDER BY N.position) AS RN FROM (VALUES('AVGHAHA'))V(S) CROSS APPLY dbo.NGrams8k(V.S,1) N) SELECT V.S,

问题 I'm a relative newcomer to Julia, and so far I am a fan of it. But coming from years of R programming, some scoping rules leave me perplexed. Let's take this function. This behaves exactly as I would expect. function foo1(x) y = x t = 1 while t < 1000 t += 1 y += 1 end return 42 end var = 0; foo1(var) # 42 var # 0 But when doing something similar on an array, it acts as a mutating function (modifies it argument in the global scope!) function foo2(x) y = x t = 1 while t < 1000 t += 1 y[1] += 1

问题 i need a T-SQL function that remove duplicate charcters in a give String for exemple Fn_Remove('AVGHAHA') it will returns AVGH 回答1: Using NGrams8K, you can split the string into individual character "tokens", apply a number to that character set, and then rebuild with only the first of each character: WITH CTE AS( SELECT V.S, N.position, N.token, ROW_NUMBER() OVER (PARTITION BY N.token ORDER BY N.position) AS RN FROM (VALUES('AVGHAHA'))V(S) CROSS APPLY dbo.NGrams8k(V.S,1) N) SELECT V.S,

问题 In the class I'm taking my teacher is discouraging the students from calling functions recursively. For example, if I want to call the main function in the following code: if (x > 5) { printf("Your number's too high. Enter a number below 5."); main(); } I'm instead encouraged to use: int x; while (x > 5) { printf("\nYour number's too high. Enter a number below 5."); scanf("%d", &x); } While I understand that the while function is a simpler way of going about this particular problem, we're