Hello again :) The last question I asked was something I stumbled upon when trying to understanding another thing... that I also can't understand (not my day). This is quite a long question statement, but at least I hope this question might prove useful to many people and not only me. The code I have is the following: template <typen...
After extensive reading of ISO/IEC 14882, Programming language – C++ I'm still unsure why const is needed for implicit conversion to a user-defined type with a single argument constructor like the following #include <iostream> class X { public: X( int value ) { printf("constructor initialized with %i",value); } } void impl...
Hello. Could anybody explain me following situation with Scala implicit conversions mechanism. There is a code: object Main { implicit val x:Int => String = v => "val" implicit def y(v:Int) = "def" def p(s:String) = print(s) def main(args: Array[String]): Unit = { p(1) } } This code prints "val". But when I comment ...
Suppose I want to have a class like Java Date. Its only data member is a long which represents the milliseconds since 1970. Would/Could it be of any performance benefit of just making a new Scala type: type PrimitiveDate = Long Then you can add methods by using implicit conversion, like it is done for int with RichInt. Does this "box...
For example the following query works fine: SELECT * FROM quotes WHERE expires_at <= '2010-10-15 10:00:00'; But this is obviously performing a 'string' comparison - I was wondering if there was a function built in to MySQL that specifically does 'datetime' comparisons. ...
hi, I'm trying to port some parts from ginac (www.ginac.de) to C#. But I encountered this: class Program { static void Main(string[] args) { symbol s = new symbol(); numeric n = new numeric(); ex e = s + n; // "Operator + doesn't work for symbol, numeric" } } class ex { //this should be alre...