casting

问题 I am currently trying to better understand Tensorflows CustomLayer feature. While implementing such a custom layer, I ran into the following error: /usr/lib/python3/dist-packages/skimage/util/dtype.py:110: UserWarning: Possible precision loss when converting from float64 to uint16 "%s to %s" % (dtypeobj_in, dtypeobj)) /usr/lib/python3/dist-packages/skimage/exposure/exposure.py:307: RuntimeWarning: invalid value encountered in true_divide image = (image - imin) / float(imax - imin) Traceback

问题 I am trying to read the data in from a text file, and then divide each value by 3, before printing the output value for each new value. An example of the format of the text file can be seen below: 0.00707946 -0.0241935 23.9401 0 0.307334 0.2046 As can be seen from the above example, every value is seperated by a space, the number of significant figures vary, and numbers can be positive or negative. I can successfully read through and print out the values to cmd as characters , however, my aim

问题 I'm trying to implement the suggestion here, specifically, this function: function eventAssigner<Handlers extends Record<keyof Handlers, (e: any) => any>, Discriminant extends keyof any>( handlers: Handlers, discriminant: Discriminant ) { return <Key extends keyof Handlers>( event: Record<Discriminant, Key> & (Parameters<Handlers[Key]>[0]) ): ReturnType<Handlers[Key]> => handlers[event[discriminant]](event); } However, eventAssigner is rejecting the type of the event that I'm providing it,

问题 I have an issue similar to the following: When is static cast safe when you are using multiple inheritance? multiple inheritance: unexpected result after cast from void * to 2nd base class but I really don't understand why it does not work, since I'm doing what is suggested (cast back to the original type). Also, templates are involved. I have a generic container of templated objects which I implement as a map of std::string IDs and void* : std::map<std::string, void*> mymap; The objects look

问题 Poco items are wrapped. abstract class AbstractPocoUI<T> { protected T PocoItem; } class PocoA { } class PocoAUI:AbstractPocoUI<PocoA> { } I want to do something like this var c = new ObservableCollection<PocoAUI>(collectionOfTypePocoA.Cast<PocoAUI>()); How can i override cast operator in abstract class? What should i do in AbstractPocoUI to get for example PocoAUI with PocoA in PocoItem field ? Thanks. 回答1: You can implement IConvertible interface or create a TypeConverter but casting cannot

问题 I have this number: 5.42418E+15 How do I convert this number to a 16 digit number like this: 4383452049412480? I am doing it manually in excel by formatting that column to Number then I select 1234 format but I want this to be done in Sql server. Thank you. 回答1: declare @F as float(53) set @F = 6713073544159400 select @F 6.7130735441594E+15 select cast( @F as decimal) 6713073544159400 回答2: try this CAST ( expression AS data_type [ ( length ) ] ) 来源： https://stackoverflow.com/questions

问题 Let's say I've got an abstract class called Player . Classes GameAPlayer and GameBPlayer inherit from Player . In turn, a couple of abstract classes inherit from GameAPlayer and GameBPlayer respectively. Let's say I've got another abstract class called Engine which hosts List<Player> . Classes GameAEngine and GameBEngine both inherit from Engine . I know for a fact that all players in GameAEngine will be of type GameAPlayer , and that all players in GameBEngine will be of type GameBPlayer . I

问题 suppose X<T> is a template class taking a class as parameter and A and B are classes with B being derived from A without involvement of multiple or virtual inheritance (i.e. no pointer adjustments necessary when casting between A and B ). is it safe to perform a chainsaw reinterpret cast from X<A*> to X<B*> or vice versa? Of course, a X<A*> is no X<B*> , but shouldn't these classes always share the same behaviour? Because pointers are used, the memory layout should be equal. Thus, it might be

问题 It is very weird problem. I have ProfileBase class and created a list from it List<ProfileBase> profileLists = .... well after i add items to this list from another list name is QuickSearchProfile which is derived from ProfileBase also. var _list = new List<ProfileBase>(); _list.AddRange((IEnumerable<QuickSearchProfile>)list); but I cant cast like that var item = (profileLists[indexPath.Row] as QuickSearchProfile); or like that var item = (QuickSearchProfile)profileLists[indexPath.Row]; in

问题 I have some missing data like :-- 1995 1996 1997 1998 1999 4 NA NA 5 NA what i want to do here is this :- 1995 1996 1997 1998 1999 4 4.3300001 4.6700001 5 5.0000002 Iam able to write code for the above interpolation (missing and stale data) but........ The data i input is not always clean. It might come as 1995 1996 1997 1998 1999 4.032 NA NA 5.134 5.0000002 This might interrupt with the precision of the interpolated numbers (who go to 7 decimal places) So i wanted to round off the data