ambiguous

问题 This is my program to solve a sudoku puzzle by using a backtracking algorithm. The program will recursively call itself until it is either solved or if it is unsolvable. The problem is that when I run it the compiler says that the sudoku_backtracker() function call in line 19 of sudoku_solver.cpp is ambiguous. Can someone please explain to me why it says that and how can I fix it. If there are other problems I would also appreciate the help. Thanks alot. #include <iostream> #include <string>

问题 I am using Spring MVC 3.2.4. I want to extend an existing annotated base controller to override some existing methods. Here is what I want to do, /**Base Controller**/ @controller public class BaseController { @RequestMapping(value="/process") public String doStuff(){ //do something } } /**Child Controller**/ @controller public class ChildController extends BaseController { @RequestMapping(value="/specicalProcess") public String doStuff(){ //do special thing super.doStuff(); } } But I got

问题 I came across: import static java.lang.Float.*; , note the static (actually it was import static java.lang.Math.* but that aside). I had never seen that before and thought it was very usefull, Float.valueOf("1.234f"); becomes valueOf("1.234f") . But when i added import static java.lang.Integer.*; also, i got an error message: "reference to valueOf is ambiguous" because both these classes have that (static) method. Is there is no way around that? I can use this only a limited of times before

问题 I think this is a simple question to answer, but I still can't figure out a way to get past it. Basically, what I wanted, was to use a Bitmap object in my Xna game. So I went ahead and added System.Drawing as an assembly reference. This worked out perfectly, except that I now get a different error; "'Color' is an ambiguous reference between 'Microsoft.Xna.Framework.Color' and 'System.Drawing'. How do I get past this? 回答1: The assembly reference alone doesn't lead to the error. It's the using

问题 Is there a manner to import a specific method signature? def test() { lazy val log = LoggerFactory.getLogger("AndroidProxy") import log.{error, debug, info, trace} trace("This is a test") trace "This is also" // <- This line will not compile } Perhaps it's not possible, but my primary goal is to allow this without adding in a new method. I've tried these to no avail import log.{error => error(_:String)} import log.{error(x: String) => error(x)} I suppose the primary challenge is that all of

问题 Using Resharper I get the following message: Ambiguous InvocationSolution ITicket.sln Project ITicket ITicket\frmMainTicket.cs:530 Ambiguous invocation: void DisableAllFields() (in class frmMainTicket) void DisableAllFields() (in class frmMainTicket) match I am new to coding and could use a little help. If I understand this correctly it is basically saying that I am calling a method and it is unsure what method I should use? I have never used Resharper before. Maybe I am confused on what

问题 Please see this newly written code now, there is no "read" used, and still I get error on ambiguous "show": data MyType0 a = Tong1 a | Tong2 a deriving Show data MyType1 a = Cons1 a | Cons2 a | Cons3 | Cons4 deriving Show data MyType2 a = MyType2 a deriving Show fun ((Cons2 s):t:ts) (symseq, MyType2 msg) = (symseq, MyType2 (msg ++ ["You provided wrong symbol: " ++ (show t) ++ " Please provide symbol: " ++ (show Cons3) ])) --fun ((Cons2 s):t:ts) (symseq, MyType2 msg) = (symseq, MyType2 (msg ++

问题 I have to execute a SQL made from some users and show its results. An example SQL could be this: SELECT t1.*, t2.* FROM table1 t1, table2 t2, where table1.id = table2.id This SQL works fine as it is, but I need to manually add pagination and show the rownum, so the SQL ends up like this. SELECT z.* FROM( SELECT y.*, ROWNUM rn FROM ( SELECT t1.*, t2.* FROM table1 t1, table2 t2, where table1.id = table2.id ) y WHERE ROWNUM <= 50) z WHERE rn > 0 This throws an exception: "ORA-00918: column

问题 So I am trying to implement the xorshift PRNGs as a parameterised STL-style class from random , like e.g. std::mersenne_twister_engine , so I can use it with those quite convenient distributions from the random library etc. Anyway, I have a problem overloading the operator<< and, frankly, I am completely stumped. The class is parameterised like this: template <size_t __n, int_least8_t __a, int_least8_t __b, int_least8_t __c, uint64_t __m> class xorshift_engine { ... The overload is declared

问题 I'm having some problems with ambiguous action methods in MVC 2. I've tried implementing the solution found here: ASP.NET MVC ambiguous action methods, but that simply gives me a "The resource cannot be found" error as it thinks I'm trying to invoke the action method I don't want to invoke. The RequiredRequestValueAttribute class I'm using is the exact same one as what was in the other question's solution: public class RequireRequestValueAttribute : ActionMethodSelectorAttribute { public