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What does the question mark and the colon (?: ternary operator) mean in objective-c?

What does this line of code mean? label.frame = (inPseudoEditMode) ? kLabelIndentedRect : kLabelRect; The ? and : confuse me. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is gcc's __attribute__((packed)) / #pragma pack unsafe?

In C, the compiler will lay out members of a struct in the order in which they're declared, with possible padding ... possible for it to do so in all cases? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Disable browser cache for entire ASP.NET website

I am looking for a method to disable the browser cache for an entire ASP.NET MVC Website I found the ... disable the browser cache for an entire website. Question&Answers:os...

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javascript - Can't perform a React state update on an unmounted component

Problem I am writing an application in React and was unable to avoid a super common pitfall, which is calling setState(.. ... }); } }; } export default Book; Question&Answers:os...

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c++ - Operator< and strict weak ordering

How to define operator< on n-tuple (for example on 3-tuple) so that it satisfy strict weak ordering concept ? I know ... < but for some reasons I can't use it. Question&Answers:os...

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How does tuple comparison work in Python?

I have been reading the Core Python programming book, and the author shows an example like: (4, 5) < (3, 5) # ... tuples? Btw, it's not explained in the book. Question&Answers:os...

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How can I run an external program from C and parse its output?

I've got a utility that outputs a list of files required by a game. How can I run that utility within a ... and retain its output (which goes to stdout). Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Unresolved external symbol on static class members

Very simply put: I have a class that consists mostly of static public members, so I can group similar functions together that ... on me. Why can't I do this? Question&Answers:os...

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console - Simple C scanf does not work?

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ruby - How to dynamically create a local variable?

I have a variable var = "some_name" and I would like to create a new object and assign it to some_name. How can I do ... .new('blah') # so that I can do this. Question&Answers:os...

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Declaring a custom android UI element using XML

How do I declare an Android UI element using XML? Question&Answers:os...

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c# - How to avoid Dependency Injection constructor madness?

I find that my constructors are starting to look like this: public MyClass(Container con, SomeClass1 obj1, ... thoughts on IoC and Dependency Injection madness. Question&Answers:os...

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javascript - Get querystring from URL using jQuery

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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IOException: read failed, socket might closed - Bluetooth on Android 4.3

Currently I am trying to deal with a strange Exception when opening a BluetoothSocket on my Nexus 7 (2012), with ... or might this be a bug in Android? Question&Answers:os...

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android - How to use RecyclerView inside NestedScrollView?

How to use RecyclerView inside NestedScrollView? RecyclerView content is not visible after setting adapter. ... /android.support.v4.widget.NestedScrollView> Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Is it possible to ping a server from Javascript?

I'm making a web app that requires that I check to see if remote servers are online or not. When I run it ... my page loads fast, I'd definitely appreciate it. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - Canvas width and height in HTML5

Is it possible to fix the width and height of an HTML5 canvas element? The usual way is the following : <canvas id="canvas" width="300" height="300"></canvas> Question&Answers:os...

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.net - What is the difference between String.Empty and "" (empty string)?

In .NET, what is the difference between String.Empty and "", and are they interchangable, or is there some ... that String.Empty will ensure are not a problem? Question&Answers:os...

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Creating default object from empty value in PHP?

I see this error only after upgrading my PHP environment to PHP 5.4 and beyond. The error points to this line of ... Do I first need to declare my $res object? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Is "inline" without "static" or "extern" ever useful in C99?

When I try to build this code inline void f() {} int main() { f(); } using the command line ... inline a function, an external definition must exist somewhere. Question&Answers:os...

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Why can't Python's raw string literals end with a single backslash?

Technically, any odd number of backslashes, as described in the documentation. >>> r'' File "<stdin>", line ... ?), but I'm probably missing something obvious. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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html - Floated elements of variable height push siblings down

I have 6 elements which should result in two rows of 3 elements each, so I've floated them. But ... solutions are preferable to JavaScript / jQuery solutions. Question&Answers:os...

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javascript - Processing $http response in service

I recently posted a detailed description of the issue I am facing here at SO. As I couldn't send an actual ... , my view is not updating. updated Plunkr here Question&Answers:os...

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Hash and salt passwords in C#

I was just going through one of DavidHayden's articles on Hashing User Passwords. Really I can't get what he ... for hashing passwords and adding salt to it? Question&Answers:os...

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python - Find intersection of two nested lists?

I know how to get an intersection of two flat lists: b1 = [1,2,3,4,5,9,11,15] b2 = [4,5,6,7 ... me a hand with this? Related Flattening a shallow list in python Question&Answers:os...

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javascript - Scroll Automatically to the Bottom of the Page

Consider I have a list of questions. When I click on the first question, it should automatically take me to ... HTML element at the bottom of the page Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Find a value in an array of objects in Javascript

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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null coalescing operator - What do two question marks together mean in C#?

Ran across this line of code: FormsAuth = formsAuth ?? new FormsAuthenticationWrapper(); What do the two question marks ... It's hard to look up in Google. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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