flags

问题 I have executed the command "readelf -h test" ("test" is my binary program) on linux, and got following text: ELF header: Magic: 7f 45 4c 46 .... Data: 2's complement, little endian ... **Flags: 0x1007, noreorder, pic, cpic, o32, mips1** ... Could you please let me know each meanings of flags of the above text in detail? I have googled it, but could not find answers. Any comments would be appreciated. 回答1: ELF header flags are architecture-specific. For MIPS they are defined in SYSTEM V

问题 In the following DataFrame, I have three columns: Code | Category | Count X A 89734 X A 239487 Y B 298787 Z B 87980 W C 098454 I need to add a column, that if a category has more than one unique code (like B in the example above), it gets a flag denoting it as a test. So the output I am looking for is this: Code | Category | Count | Test_Flag X A 89734 X A 239487 Y B 298787 T Z B 87980 T W C 098454 回答1: You could also opt for transform with numpy.where for filling the values. df['Test_flag']

问题 If I write data to a file via file_put_contents with the FILE_APPEND flag set and two users submit data at the same time, will it append regardless, or is there a chance one entry will be overwritten? If I set the LOCK_EX flag, will the second submission wait for the first submission to complete, or is the data lost when an exclusive lock can't be obtained? How does PHP generally handle that? I'm running version 5.2.9. if that matters. Thanks, Ryan 回答1: you could also check the flock function

问题 After performing a mathematical operation, for say, multiplying two integers, is it possible to access the overflow flag register in a CPU with C++ ? If not what are other fast ways to check for an overflow ? 回答1: No, generally it's impossible. Some CPUs don't even have such a flag (e.g. MIPS). The link provided in one of the comments will give you ideas on how you can do overflow checks. Remember that in C and C++ signed integer overflows cause undefined behavior and legally you cannot

问题 If I have an enum that's marked with [Flags] , is there a way in .NET to test a value of this type to see if it only contains a single value? I can get the result I want using bit-counting, but I'd rather use built-in functions if possible. When looping through the enum values dynamically, Enum.GetValues() returns the combination flags as well. Calling that function on the enum in the following example returns 4 values. However, I don't want the value combinations included in the inner

问题 I'm getting a lot of noise from the output of the 3rd party's page i'm currently playing with and i wonder if there's a way to filter the output on the console. Something like Logcat's flags. Is there a way to do that? EDIT I found a way to disable the output that was causing the biggest ammount of noise. I clicked with the right-clicked on the console and then disabled the XMLHttpRequest Logging option. It's not what i wanted, but it's what i needed. 回答1: You can use regular expressions. For

问题 I have a [Flags] enum like this: [Flags] public enum Status { None = 0, Active = 1, Inactive = 2, Unknown = 4 } A Status enum may contain two values such as: Status s = Status.Active | Status.Unknown; Now I need to create a linq query (LINQ to ADO.NET Entities) and ask for records whose status is s above, that is Active or Unknown; var result = from r in db.Records select r where (r.Status & (byte)s) == r.Status Of course I get an error, because LINQ to Entities only knows to handle primitive

问题 I am starting my java app with the following command line : java -XX:+PrintCommandLineFlags -verbose:gc -XX:+PrintGCDetails \ -XX:+UseConcMarkSweepGC -jar start.jar The JVM enables the following options: -XX:MaxNewSize=87244800 -XX:MaxTenuringThreshold=4 -XX:NewRatio=7 -XX:NewSize=21811200 -XX:OldPLABSize=16 -XX:OldSize=65433600 -XX:+PrintCommandLineFlags -XX:+PrintGC -XX:+PrintGCDetails -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC -XX:+UseParNewGC Can anyone explains me the meaning of

问题 I've got 5 states in my app, and I use BOOL flags to mark them. But it isn't straightforward, because I have to write 5 lines to change all flags when I want to change state. Can you write some ideas or simple code to solve this problem? code: //need to choose second state flag1 = false; flag2 = true; flag3 = false; flag4 = false; flag5 = false; Also, it's to bad because I can choose 2 states one time. P.S. I found modern and more Apple-way. Answer below. 回答1: Use typedef enum to define all

问题 In my menu I have some items. Home is an item of it that I want to be root of my application and whenever user clicks on it, Android clear stack and then come back to main screen. This is my code: menu.setOnItemClickedListener(new MenuClickedListener() { public void eventOccured(int id) { Intent intent = null; switch(id) { case 1: intent = new Intent(context, More.class); break; case 2: intent = new Intent(context, FavoriteScreen.class); break; case 3: intent = new Intent(context,