casting

问题 How can one convert an array of bytes into a double value in Swift? (It's an NSInputStream extension) My snippet attached below, but it's not returning correct double value: func readDouble() -> Double { var readBuffer = Array<UInt8>(count:sizeof(Double), repeatedValue: 0) let numberOfBytesRead = self.read(&readBuffer, maxLength: readBuffer.count) let help1 = Int(readBuffer[0] & 0xff) << 56 | Int(readBuffer[1] & 0xff) << 48 let help2 = Int(readBuffer[2] & 0xff) << 40 | Int(readBuffer[3] &

问题 Can someone help me with this error ? I'm C++ newbie. And it seems the error occurs right in a bunch of macros. What can I do to solve it ? Or how can I track it down to the source ? I don't really understand the error. Does it mean the compiler tried to convert the method void ReadCPUparameter() to a LRESULT funcName(WPARAM wParam, LPARAM lParam) function header ? Error: // error C2440: 'static_cast' : cannot convert from // 'void (__thiscall CStartup::* )(void)' to // 'LRESULT (__thiscall

问题 I am facing a problem, few days ago I had this issue which is solved but when I was retrieving data it was object so with the help of the below code I have converted that as array but now when I try to access the array I am getting Undefined index notice. Controller public function downline_income($userId = null, $offset = 0) { $userId = user::id(); $limit = AZ::setting('record_per_page'); $objUser = new User_Object; $objUser->id = $userId; $downline = $this->user->getDownline($objUser);

问题 I am facing a problem, few days ago I had this issue which is solved but when I was retrieving data it was object so with the help of the below code I have converted that as array but now when I try to access the array I am getting Undefined index notice. Controller public function downline_income($userId = null, $offset = 0) { $userId = user::id(); $limit = AZ::setting('record_per_page'); $objUser = new User_Object; $objUser->id = $userId; $downline = $this->user->getDownline($objUser);

问题 I am working on a project in which I am getting TypeSafety issues on initializing one method with a particular size. In my run method, I have yellow line on the new ArrayList[tableLists.size()] and complaining about- Type safety: The expression of type ArrayList[] needs unchecked conversion to conform to ArrayList<Method>[] Below is the code. private ArrayList<Method> methods[] = null; @Override public void run() { methods = new ArrayList[tableLists.size()]; } How can I fix this TypeSafety

问题 This works perfectly on the server (sql server 2012) for a julian date of 5 digits select cast (column1 as DATETIME) FROM mytable How to cast an int to datetime in sybase? And which would be the best way, since I have a large table and I have to minimize the time i'm going to be using the server under the query. I saw here: http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.infocenter.dc32300.1570/html/sqlug/sqlug645.htm that it is allowed to convert from int to varchar and from

问题 I'm trying to remove blank spaces that appear in a CHAR column within DB2. I received some helped here with the function TRANSLATE to determine if Left contained records that began with three letters: select pat.f1, hos.hpid, hos.hpcd from patall3 pat join hospidl1 hos on pat.f1=hos.hpacct where TRANSLATE( LEFT( hos.hpid, 3 ), 'AAAAAAAAAAAAAAAAAAAAAAAAA', 'BCDEFGHIJKLMNOPQRSTUVWXYZ' ) <> 'AAA' order by pat.f1; But as you can see in my screenshot, there are records that remain, presumably

问题 I'm trying to convert a column from char (8) to integer in order to make a referential integrity with an integer. IT didn't work and I test a select in order to check the cast. Utente_cd is a char (8) column SEL CAST(UTENTE_CD AS INTEGER) FROM TABLEA Teradata produces this error: SELECT Failed. 2621: Bad character in format or data of TABLEA. Sometime the char column contains also an alphanumeric code that I should discard. 回答1: In TD15.10 you can do TRYCAST(UTENTE_CD AS INTEGER) which will

问题 When I convert a factor to a numeric or integer, I get the underlying level codes, not the values as numbers. f <- factor(sample(runif(5), 20, replace = TRUE)) ## [1] 0.0248644019011408 0.0248644019011408 0.179684827337041 ## [4] 0.0284090070053935 0.363644931698218 0.363644931698218 ## [7] 0.179684827337041 0.249704354675487 0.249704354675487 ## [10] 0.0248644019011408 0.249704354675487 0.0284090070053935 ## [13] 0.179684827337041 0.0248644019011408 0.179684827337041 ## [16] 0

问题 This may already have an answer but I've not been able to find an exact case of what I'm attempting. Suppose you have some generic variant-like class like so (irrelevant details omitted): /* in hpp file */ struct Base { void * data; Base(); virtual ~Base(); // ... virtual bool Read(...); } template <Some_Enum_Class T> struct Derived : Base { // T-specific interface to deal with Base::data bool Read(...); /* implementation in separate cpp file */ } For reasons specific to the project, it will