flags

I have a problem with flag bits. I have an int variable to hold flags. First I set some flags to that variable. Later I need check how many flags were set in that variable. But I don't know to do it. To check to see if a bit value is set: int value = VALUE_TO_CHECK | OTHER_VALUE_TO_CHECK; if ((value & VALUE_TO_CHECK) == VALUE_TO_CHECK) { // do something--it was set } if ((value & OTHER_VALUE_TO_CHECK) == OTHER_VALUE_TO_CHECK) { // also set (if it gets in here, then it was defined in // value, but it does not guarantee that it was set with // OR without other values. To guarantee it's only this

For testing purposes only, I am allowing my app APK to be downloaded and installed via a URL. Once downloaded on the phone, it can be launched with the Android app installer which gives the user an option to install it to their device and then run it. Consider if we downloaded and ran the app in the way described above. The main/launcher activity in my app is a login page ( Activity A ). Once the user is authenticated, they are taken to the main area of the application, e.g. Activity B . So now the current activity stack of this task is A > B . I then press the home button on the phone and am

Let's say I have this enum: [Flags] enum Letters { A = 1, B = 2, C = 4, AB = A | B, All = A | B | C, } To check if for example AB is set I can do this: if((letter & Letters.AB) == Letters.AB) Is there a simpler way to check if any of the flags of a combined flag constant are set than the following? if((letter & Letters.A) == Letters.A || (letter & Letters.B) == Letters.B) Could you for example swap the & with something? Not too stable when it comes to binary stuff like this... yeyeyerman If you want to know if letter has any of the letters in AB you must use the AND & operator. Something like:

I have two activities in the stack, in order to show them I use FLAG_ACTIVITY_REORDER_TO_FRONT. So far so good, the problem comes when I want to bring the activity with an animation using overridePendingTransition. Intent i = new Intent(ActivityA.this, ActivityB.class); i.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT); ActivityA.this.startActivity(i); overridePendingTransition(R.anim.transition_to_right, R.anim.transition_to_left); The transition is not shown, however, if the flag is not added to the intent (removing line 2) then there is no problem. Is it possible to bring an activity to

I'm attempting to create a function with flags as its arguments but the output is always different with what's expected : define("FLAG_A", 1); define("FLAG_B", 4); define("FLAG_C", 7); function test_flags($flags) { if($flags & FLAG_A) echo "A"; if($flags & FLAG_B) echo "B"; if($flags & FLAG_C) echo "C"; } test_flags(FLAG_B | FLAG_C); # Output is always ABC, not BC How can I fix this problem? Ignacio Vazquez-Abrams Flags must be powers of 2 in order to bitwise-or together properly. define("FLAG_A", 0x1); define("FLAG_B", 0x2); define("FLAG_C", 0x4); function test_flags($flags) { if ($flags &

所有参考来自网上仅仅做学习记录用，具体正确性需要在具体项目各自验证，不涉及具体错误代码处理调试等问题，欢迎发现发现问题~ 参考： 1. https://blog.csdn.net/LiheZhu/article/details/50485317 2. https://mangoroom.cn/opencv/opencv-learning-imread.html 1 . 该函数位于Highgui.h和Loadsave.cpp文件中。 Mat imread( const string& filename, int flags ) { Mat img; imread_( filename, flags, LOAD_MAT, &img ); return img; } 接下来看一下imread_函数中关于flags的部分 int type = decoder->type(); if( flags != -1 ) { if( (flags & CV_LOAD_IMAGE_ANYDEPTH) == 0 ) type = CV_MAKETYPE(CV_8U, CV_MAT_CN(type)); if( (flags & CV_LOAD_IMAGE_COLOR) != 0 || ((flags & CV_LOAD_IMAGE_ANYCOLOR) != 0 && CV_MAT_CN(type) >