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  • Specify a base classes template parameters while instantiating a derived class?

    - by DaClown
    Hi, I have no idea if the title makes any sense but I can't find the right words to descibe my "problem" in one line. Anyway, here is my problem. There is an interface for a search: template <typename InputType, typename ResultType> class Search { public: virtual void search (InputType) = 0; virtual void getResult(ResultType&) = 0; }; and several derived classes like: template <typename InputType, typename ResultType> class XMLSearch : public Search<InputType, ResultType> { public: void search (InputType) { ... }; void getResult(ResultType&) { ... }; }; The derived classes shall be used in the source code later on. I would like to hold a simple pointer to a Search without specifying the template parameters, then assign a new XMLSearch and thereby define the template parameters of Search and XMLSearch Search *s = new XMLSearch<int, int>(); I found a way that works syntactically like what I'm trying to do, but it seems a bit odd to really use it: template <typename T> class Derived; class Base { public: template <typename T> bool GetValue(T &value) { Derived<T> *castedThis=dynamic_cast<Derived<T>* >(this); if(castedThis) return castedThis->GetValue(value); return false; } virtual void Dummy() {} }; template <typename T> class Derived : public Base { public: Derived<T>() { mValue=17; } bool GetValue(T &value) { value=mValue; return true; } T mValue; }; int main(int argc, char* argv[]) { Base *v=new Derived<int>; int i=0; if(!v->GetValue(i)) std::cout<<"Wrong type int."<<std::endl; float f=0.0; if(!v->GetValue(f)) std::cout<<"Wrong type float."<<std::endl; std::cout<<i<<std::endl<<f; char c; std::cin>>c; return 0; } Is there a better way to accomplish this?

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  • How do you pass a JSON object to an MVC action parameters?

    - by TimTam
    I would like to pass {"parameter1":true, "parameter2":false, "parameter3":true} To my action public JsonResult Action(bool parameter1, bool parameter2, bool parameter3) { //... } Using JQueries ajax method using the JSON as the data parameter (data: {"parameter1...) How do I accomplish this, right now my parameters aren't getting recognized on the server side.

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  • Would the instance reference parameters passed into the static methods get garbage collected?

    - by 123Developer
    I know that the static objects in .Net managed world are loaded in Loader Heap which is never going to be garbage collected. What happens to the instance reference parameters passed to a static methods. Are they get garbage collected once the static function executed completely Or they are going to live forever as those instance reference variables are once passed to static method? I am really confused this evening; Please guide me. Thanks and regards 123Developer.

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  • Static variables within functions in C++ - allocated even if function doesn't run?

    - by John C
    I've been reading up on C++ on the Internet, and here's one thing that I haven't been quite able to find an answer to. I know that static variables used within functions are akin to globals, and that subsequent invocations of that function will have the static variable retain its value between calls. However, if the function is never claled, does the static variable get allocated? Thanks

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  • How do I call functions inside c++ dll from lua?

    - by Brian T Hannan
    I have a dll written in C++ that is legacy code and cannot modify the source code. I want to be able to call some of the functions inside of the dll from lua. For example, I'd like to do something like this: -- My Lua File include(myCppDll.dll) function callCppFunctionFromDll() local result = myCppFunctionFromDll(arg1, arg2) --Do something with result here end Is something like this possible?

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  • Using "null" in jQuery functions. Is this okay?

    - by Nick
    My database consists of some entries which are NULL (so they don't affect max, min, etc..). When I pull all of the data from the database, I need to repopulate form fields with the values. Using .val(value) where value = NULL seems to work without any problems, but I'm not sure if this is a valid way to go about this. It doesn't say anything in the jQuery documentation (that I can find) about using NULL as parameters to functions.

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  • Optimize inserts

    - by ikerib
    Hi! I did an importer in VB .Net witch get data from an SQLServer an inserts this data throught ADSL connection in a remote MySQL server. in the first time, it was like 200 records, but now there are more than 500.000 records and it expends like 11hours exporting all the data and that is bad, veryyy bad. I need to optimize my importer, witch now gets the data into a datatable an them i have a function witch with a loop (row to row) inserts the data with a "insert into" query... like this: For Each dr As DataRow In dt.Rows Console.Write(".") Dim sql As String = "INSERT INTO clientes(id,nombrefis,nombrecom,direccion,codpos,municipio_id,telefono,fax,cif)" & _ "VALUES (@id,@nombrefis,@nombrecom,@direccion,@codpos,@municipio_id,@telefono,@fax,@cif)" cmd = New MySqlCommand(sql, cnn) cmd.Parameters.AddWithValue("id", Int32.Parse(dr("ID EMPRESA").ToString)) cmd.Parameters.AddWithValue("nombrefis", dr("NOMEMP")) cmd.Parameters.AddWithValue("nombrecom", dr("EMPRESA")) cmd.Parameters.AddWithValue("direccion", dr("DIRECC")) cmd.Parameters.AddWithValue("codpos", dr("CODPOS")) cmd.Parameters.AddWithValue("municipio_id", Int32.Parse(dr("CODIGO MUNICIPIO")).ToString) cmd.Parameters.AddWithValue("telefono", dr("TELEF")) cmd.Parameters.AddWithValue("fax", dr("FAX")) cmd.Parameters.AddWithValue("cif", dr("CIF")) cmd.ExecuteNonQuery() Next any ideas or advices? thanks so much

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  • Can't bind string containing @ char with mysqli_stmt_bind_param

    - by Tirithen
    I have a problem with my database class. I have a method that takes one prepared statement and any number of parameters, binds them to the statement, executes the statement and formats the result into a multidimentional array. Everthing works fine until I try to include an email adress in one of the parameters. The email contains an @ character and that one seems to break everything. When I supply with parameters: $types = "ss" and $parameters = array("[email protected]", "testtest") I get the error: Warning: Parameter 3 to mysqli_stmt_bind_param() expected to be a reference, value given in ...db/Database.class.php on line 63 Here is the method: private function bindAndExecutePreparedStatement(&$statement, $parameters, $types) { if(!empty($parameters)) { call_user_func_array('mysqli_stmt_bind_param', array_merge(array($statement, $types), &$parameters)); /*foreach($parameters as $key => $value) { mysqli_stmt_bind_param($statement, 's', $value); }*/ } $result = array(); $statement->execute() or debugLog("Database error: ".$statement->error); $rows = array(); if($this->stmt_bind_assoc($statement, $row)) { while($statement->fetch()) { $copied_row = array(); foreach($row as $key => $value) { if($value !== null && mb_substr($value, 0, 1, "UTF-8") == NESTED) { // If value has a nested result inside $value = mb_substr($value, 1, mb_strlen($value, "UTF-8") - 1, "UTF-8"); $value = $this->parse_nested_result_value($value); } $copied_row[$ke<y] = $value; } $rows[] = $copied_row; } } // Generate result $result['rows'] = $rows; $result['insert_id'] = $statement->insert_id; $result['affected_rows'] = $statement->affected_rows; $result['error'] = $statement->error; return $result; } I have gotten one suggestion that: the array_merge is casting parameter to string in the merge change it to &$parameters so it remains a reference So I tried that (3rd line of the method), but it did not do any difference. How should I do? Is there a better way to do this without call_user_func_array?

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  • Am I trying to Implement Multiple Inheritance. How can I do this.

    - by Shantanu Gupta
    I have created a class say A which has some functions defined as protected. Now Class B inherits A and class C inherits B. Class A has private default constructor and protected parameterized constructor. I want Class B to be able to access all the protected functions defined in Class A but class C can have access on some of the functions only not all the functions and class C is inheriting class B. How can I restrict access to some of the functions of Class A from Class C ? EDIT: namespace Db { public Class A { private A(){} protected A(string con){assign this value} protected DataTable getTable(){return Table;} protected Sqlparameters setParameters(){return parameter;} } } namespace Data { public Class B:A { protected B():base("constring"){} protected DataTable output(){return getTable();} protected sqlparameter values(param IDataParameter[] parameter){} } } namespace Bsns { public Class C:B { protected C():base(){} protected DataTable show() {return values(setparameter());} } } EDIT I think what I am trying to do here is Multiple inheritance. Please check. Class A { //suppose 10 functions are declared } Class B:A { //5 functions declared which are using A's function in internal body } Class C:B { //using all functions of B but require only 4 functions of A to be accessible by C. }

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  • Stored procedure or function expects parameter which is not supplied

    - by user2920046
    I am trying to insert data into a SQL Server database by calling a stored procedure, but I am getting the error Procedure or function 'SHOWuser' expects parameter '@userID', which was not supplied. My stored procedure is called "SHOWuser". I have checked it thoroughly and no parameters is missing. My code is: public void SHOWuser(string userName, string password, string emailAddress, List preferences) { SqlConnection dbcon = new SqlConnection(conn); try { SqlCommand cmd = new SqlCommand(); cmd.Connection = dbcon; cmd.CommandType = System.Data.CommandType.StoredProcedure; cmd.CommandText = "SHOWuser"; cmd.Parameters.AddWithValue("@userName", userName); cmd.Parameters.AddWithValue("@password", password); cmd.Parameters.AddWithValue("@emailAddress", emailAddress); dbcon.Open(); int i = Convert.ToInt32(cmd.ExecuteScalar()); cmd.Parameters.Clear(); cmd.CommandText = "tbl_pref"; foreach (int preference in preferences) { cmd.Parameters.Clear(); cmd.Parameters.AddWithValue("@userID", Convert.ToInt32(i)); cmd.Parameters.AddWithValue("@preferenceID", Convert.ToInt32(preference)); cmd.ExecuteNonQuery(); } } catch (Exception) { throw; } finally { dbcon.Close(); } and the stored procedure is: ALTER PROCEDURE [dbo].[SHOWuser] -- Add the parameters for the stored procedure here ( @userName varchar(50), @password nvarchar(50), @emailAddress nvarchar(50) ) AS BEGIN INSERT INTO tbl_user(userName,password,emailAddress) values(@userName,@password,@emailAddress) select tbl_user.userID,tbl_user.userName,tbl_user.password,tbl_user.emailAddress, stuff((select ',' + preferenceName from tbl_pref_master inner join tbl_preferences on tbl_pref_master.preferenceID = tbl_preferences.preferenceID where tbl_preferences.userID=tbl_user.userID FOR XML PATH ('')),1,1,' ' ) AS Preferences from tbl_user SELECT SCOPE_IDENTITY(); END Pls help, Thankx in advance...

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