variable-length

Finding whether a string starts with one of a list's variable-length prefixes

由 对着背影说爱祢 提交于 2019-12-03 19:47:41
问题 I need to find out whether a name starts with any of a list's prefixes and then remove it, like: if name[:2] in ["i_", "c_", "m_", "l_", "d_", "t_", "e_", "b_"]: name = name[2:] The above only works for list prefixes with a length of two. I need the same functionality for variable-length prefixes . How is it done efficiently (little code and good performance)? A for loop iterating over each prefix and then checking name.startswith(prefix) to finally slice the name according to the length of

MVC 4 - More Elegant way to Edit Variable-Length List of Items?

由 依然范特西╮ 提交于 2019-12-03 07:10:20
问题 The best advice I found for editing a variable-length list of items was written for ASP.Net MVC 2 in 2008. http://blog.stevensanderson.com/2008/12/22/editing-a-variable-length-list-of-items-in-aspnet-mvc/ Is that approach still the best one for ASP.Net MVC 4, or is there a newer solution that is either standardized, or more elegant? 回答1: Take a look at http://knockoutjs.com/ it's a JavaScript framework that relies on the MVVM pattern. Basically you can data-bind array models to your HTML and

Variable length template arguments list?

由 ℡╲_俬逩灬. 提交于 2019-12-03 05:15:30
问题 I remember seing something like this being done: template <ListOfTypenames> class X : public ListOfTypenames {}; that is, X inherits from a variable length list of typenames passed as the template arguments. This code is hypothetical, of course. I can't find any reference for this, though. Is it possible? Is it C++0x? 回答1: You can do it in current C++. You give the template a "large enough" number of parameters, and you give them defaults: class nothing1 {}; class nothing2 {}; class nothing3

MVC 4 - More Elegant way to Edit Variable-Length List of Items?

由 狂风中的少年 提交于 2019-12-02 20:43:16
The best advice I found for editing a variable-length list of items was written for ASP.Net MVC 2 in 2008. http://blog.stevensanderson.com/2008/12/22/editing-a-variable-length-list-of-items-in-aspnet-mvc/ Is that approach still the best one for ASP.Net MVC 4, or is there a newer solution that is either standardized, or more elegant? Take a look at http://knockoutjs.com/ it's a JavaScript framework that relies on the MVVM pattern. Basically you can data-bind array models to your HTML and then post them back as JSON arrays to your controller. One great side-effect is that it helps to make your

Variable length template arguments list?

由 ﹥＞﹥吖頭↗ 提交于 2019-12-02 19:38:54
I remember seing something like this being done: template <ListOfTypenames> class X : public ListOfTypenames {}; that is, X inherits from a variable length list of typenames passed as the template arguments. This code is hypothetical, of course. I can't find any reference for this, though. Is it possible? Is it C++0x? Daniel Earwicker You can do it in current C++. You give the template a "large enough" number of parameters, and you give them defaults: class nothing1 {}; class nothing2 {}; class nothing3 {}; template <class T1 = nothing1, class T2 = nothing2, class T3 = nothing3> class X :

Finding longest length out of 3 different vectors in R

由 旧街凉风 提交于 2019-12-02 05:59:57
问题 I do not know if there is a function for this but I have 3 dataframes with different lengths. I was wondering if there is a way to find which one is the largest length and load that into a variable. For example: x <- c(1:10) y <- c(1:20) z <- c(1:40) I would want to use z as my variable because it has the longest length. Is there a function that can search through these 3 variables (x,y,z) and give me back the one with the longest length? Thanks 回答1: We can place it in a list , use lengths to

Finding longest length out of 3 different vectors in R

由 被刻印的时光 ゝ 提交于 2019-12-02 02:18:57
I do not know if there is a function for this but I have 3 dataframes with different lengths. I was wondering if there is a way to find which one is the largest length and load that into a variable. For example: x <- c(1:10) y <- c(1:20) z <- c(1:40) I would want to use z as my variable because it has the longest length. Is there a function that can search through these 3 variables (x,y,z) and give me back the one with the longest length? Thanks We can place it in a list , use lengths to create an index of maximum length and extract those element from the list lst[which.max(lengths(lst))] data

Objective-c - Passing in variables to a variable-length method

由 老子叫甜甜 提交于 2019-12-01 21:38:04
问题 I've got an array with items, and I want to pass these in to a variable-length method. How do you do that? I.e., I've got this (for example): NSArray *array = [NSArray arrayWithObjects:@"1", @"2", @"3", nil]; [[UIAlertView alloc] initWithTitle:@"title" message:@"message" delegate:nil cancelButtonTitle:[array objectAtIndex:0] otherButtonTitles:[array objectAtIndex:1], [array objectAtIndex:2], nil]; But imagine that array could have a variable length of items, so you cant hardcode it like this.

javascript object max size limit at 10000 chars

由 牧云@^-^@ 提交于 2019-12-01 08:10:49
问题 When I run this code, the variable items only appends 9999 chars and rest is truncated. I got a few answers in the previous post but the problem still persists. var items = []; for (var i = 1; i < 400; i++) { items.push('{"Key":' + '"this is a javascript value"' + ",'+'" + '"Value"' + ':' + '"this is value"}'); } alert(items); Help! 回答1: You are alert ing the value which means the array is converted to a String and then put in an alert box. Most probably, the String is cut off to some maximum

Why is void f(…) not allowed in C?

由 依然范特西╮ 提交于 2019-11-30 21:19:02
Why doesn't C allow a function with variable length argument list such as: void f(...) { // do something... } I think the motivation for the requirement that varargs functions must have a named parameter is for uniformity of va_start . For ease of implementation, va_start takes the name of the last named parameter. With a typical varargs calling convention, and depending on the direction arguments are stored, va_arg will find the first vararg at address (&parameter_name) + 1 or (first_vararg_type*)(&parameter_name) - 1 , plus or minus some padding to ensure alignment. I don't think there's any
订阅 variable-length