flags

下面两种方法均可让对话框的问号按钮去掉，如果其中一种不生效，可更换另一种 1 方法一 Qt::WindowFlags flags = Qt::Dialog; flags |= Qt::WindowCloseButtonHint; dlg->setWindowFlags(flags); 2 方法二 this->setWindowFlags(Qt::CustomizeWindowHint | Qt::WindowCloseButtonHint); 来源： https://www.cnblogs.com/LuckCoder/p/11715535.html

I have arrived at Android Studio 3.0.0 (from the stable channel) via 3.0.0-rcX (from the Canary channel). When I start a brand new app and build it, the following code (inside the app) shows that the FLAG_TEST_ONLY flag is set. Log.e(TAG, "ApplicationInfo: " + (getApplicationInfo().flags & ApplicationInfo.FLAG_TEST_ONLY)); 10-31 09:54:05.226 16129-16129/com.example.dummy E/MainActivity: ApplicationInfo: 256 The app's manifest is: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.dummy"> <application android

C++ is mostly a superset of C, but not always. In particular, while enumeration values in both C and C++ implicitly convert into int, the reverse isn't true: only in C do ints convert back into enumeration values. Thus, bitflags defined via enumeration declarations don't work correctly. Hence, this is OK in C, but not in C++: typedef enum Foo { Foo_First = 1<<0, Foo_Second = 1<<1, } Foo; int main(void) { Foo x = Foo_First | Foo_Second; // error in C++ return 0; } How should this problem be handled efficiently and correctly, ideally without harming the debugger-friendly nature of using Foo as

I noticed that some functions in PHP use flags as arguments. What makes them unique instead of plain string arguments? I'm asking since I want to use them on my own custom functions but am curious as to what the process is for doing so. Edit: TO summarize, when is it best to create a custom function with flags and when is it not ? They are just constants which map to a number, e.g. SORT_NUMERIC (a constant used by sorting functions) is the integer 1 . Check out the examples for json_encode() . As you can see, each flag is 2 n . This way, | can be used to specify multiple flags . For example,

While looking for ways to add an ordered to-many relationship to my Core Data model, with the least possible amount of changes to the model, I noticed an option of the to-many relationship that says ordered (see screenshot below). Wow, sounds great, but what does it do? My SQLite store is not complaining when I check or uncheck it, and my app still compiles and runs fine too. I was thinking maybe the lightweight migration takes care of the change, but from the looks of it, all my custom NSManagedObject subclasses work without the need for modification too, so what's going on? To summarize the