Error Cannot Use An Object As Parameter To A Method
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Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with arraylist in java us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Cannot use object as a type of method's default parameter up vote 3 down vote favorite My code looks like this static void SomeVoid(object obj1, object ojb2 = someDefaultValue) { // Do Something Here } the compiler says that Default parameter value for the 'obj2' must be a compile-time constant. what can I do ? someDefaultValue is string.Empty in my case. c# object default-parameters share|improve this question asked Jun 11 '13 at 14:50 Dima 92931939 add a comment| 4 Answers 4 active oldest votes up vote 4 down vote accepted Change parameter type to string, and use empty string instead: static void SomeVoid(object obj1, string ojb2 = "") { // Do Something Here } Compiler is complaining, because default parameter value will be provided during compilation in place where your method is called. I.e. when you write Foo.SomeVoid(42); It would compile into Foo.SomeVoid(42, ""); That's why default parameter value should be constant value. Also parameter type should be string, because all reference type parameters can be initialized with null constant only. And object is a reference type. There is workaround for you. You can use parameter of object type with default value null and handle that value manually inside your method: static void SomeVoid(object obj1, object obj2 =
Types Generic Methods Bounded Type Parameters Generic Methods and Bounded Type Parameters Generics, Inheritance, and Subtypes Type Inference Wildcards Upper Bounded Wildcards Unbounded Wildcards Lower Bounded Wildcards Wildcards and Subtyping Wildcard Capture and Helper Methods Guidelines for Wildcard Use Type Erasure Erasure of Generic Types Erasure of Generic Methods Effects of Type Erasure and Bridge Methods Non-Reifiable Types Restrictions on Generics Questions and Exercises Trail: Learning the Java Language Lesson: Generics (Updated) Home Page > Learning the Java Language > Generics (Updated) «Previous•Trail•Next» Restrictions on Generics To use Java generics effectively, you must consider the following http://stackoverflow.com/questions/17047132/cannot-use-object-as-a-type-of-methods-default-parameter restrictions: Cannot Instantiate Generic Types with Primitive Types Cannot Create Instances of Type Parameters Cannot Declare Static Fields Whose Types are Type Parameters Cannot Use Casts or instanceof With Parameterized Types Cannot Create Arrays of Parameterized Types Cannot Create, Catch, or Throw Objects of Parameterized Types Cannot Overload a Method Where the Formal Parameter Types of Each Overload Erase to the Same Raw Type https://docs.oracle.com/javase/tutorial/java/generics/restrictions.html Cannot Instantiate Generic Types with Primitive Types Consider the following parameterized type: class Pair
Sign in Pricing Blog Support Search GitHub This repository Watch 663 Star 11,436 Fork 3,013 ParsePlatform/parse-server Code Issues 110 Pull https://github.com/ParsePlatform/parse-server/issues/2201 requests 17 Projects 0 Wiki Pulse Graphs New issue Can't query http://www.freepascal.org/docs-html/user/userse62.html "installation", get the error: You cannot use [object Object] as a query parameter #2201 Closed caltv opened this Issue Jul 4, 2016 · 4 comments Projects None yet Labels None yet Milestone No milestone Assignees No one assigned 3 participants caltv commented error cannot Jul 4, 2016 • edited After migrating to Parse Server this query in Cloud Code has stopped working, I see the error: You cannot use [object Object] as a query parameter User is a pointer in the Installation object..Any ideas? var user1 = new Parse.Query(Parse.User); user1.equalTo("fbId", request.params.fbid); var pushQuery = new Parse.Query(Parse.Installation); pushQuery.equalTo('user', user1); pushQuery.find({ success: error cannot use function(object) { console.log("pushQuery got " + object.length); }, error:function(error) { console.error("pushQuery find failed. error = " + error.message); } }); doender commented Jul 4, 2016 In this code, user1 is a query, not an object/pointer. In order for this to work, you would first need to query for the actual user object, and then user that in pushQuery caltv commented Jul 4, 2016 • edited User1 returns a user object. I see the object logged out. Could you give me an exact example of what you mean? doender commented Jul 4, 2016 Something like this var userQuery = new Parse.Query(Parse.User); userQuery.equalTo('fbId', request.params.fbid); userQuery.first().then( function(user) { if (user) { var pushQuery = new Parse.Query(Parse.Installation); pushQuery.equalTo('user', user); return pushQuery.find(); } else { return Parse.Promise.error({"message": "User not found"}); } } ).then( function(results) { console.log("Number of results: " + results.length); }, function(error) { console.log(error); } ); flovilmart commented Jul 4, 2016 Or you can use matchesQuery var user1Query = new Parse.Query(Parse.User); user1Query.equalTo("fbId", request.params.fbid); var pushQuery = new Parse.Query(Parse.Installation); pushQuery.matchesQuery('user', user1Query); pushQ
An error against the Turbo Pascal language was encountered. This typically happens when an illegal character is found in the source file. Error: INTERRUPT procedure cannot be nested An INTERRUPT procedure must be global. Warning: Procedure type "arg1" ignored The specified procedure directive is ignored by FPC programs. Error: Not all declarations of "arg1" are declared with OVERLOAD When you want to use overloading using the OVERLOAD directive, then all declarations need to have OVERLOAD specified. Error: Duplicate exported function name "arg1" Exported function names inside a specific DLL must all be different. Error: Duplicate exported function index arg1 Exported function indexes inside a specific DLL must all be different. Error: Invalid index for exported function DLL function index must be in the range 1..$FFFF. Warning: Relocatable DLL or executable arg1 debug info does not work, disabled. It is currently not possible to include debug information in a relocatable DLL. Warning: To allow debugging for win32 code you need to disable relocation with -WN option Stabs debug info is wrong for relocatable DLL or EXES. Use -WN if you want to debug win32 executables. Error: Constructor name must be INIT You are declaring an object constructor with a name which is not init, and the -Ss switch is in effect. See the switch -Ss (see page 115). Error: Destructor name must be DONE You are declaring an object destructor with a name which is not done, and the -Ss switch is in effect. See the switch -Ss (see page 115). Error: Procedure type INLINE not supported You tried to compile a program with C++ style inlining, and forgot to specify the -Si option (-Si (see page 114)). The compiler doesn't support C++ styled inlining by default. Warning: Constructor should be public Constructors must be in the 'public' part of an object (class) declaration. Warning: Destructor should be public Destructors must be in the 'public' part of an object (class) declaration. Note: Class should have one destructor only You can declare only one destructor for a class. Error: Local class definitions are not allowed Classes must be defined globally. They cannot be defined inside a procedure or function. Fatal: Anonymous class definitions are not allowed An invalid object (class) declaration was encountered, i.e. an object or class without methods that isn't derived from another object or class. For example: Type o = object