If they are related Let’s for a moment assume that B is actually a base of D. Then for the call to check, both versions are viable because Host can be converted to D* and B*. It’s a user defined conversion sequence as described by 13.3.3.1.2 from Host<B, D> to D* and B* respectively. For … Read more
The return-as-rvalue rules changed in response to the review before publication of C++14. The change was added late in the process and is captured by CWG Issue 1579, that amends 12.8/32 with the wording: or when the expression in a return statement is a (possibly parenthesized) id-expression that names an object with automatic storage duration … Read more
I can give a partial answer for the point 4. This can be obtained by applying a technique such as : http://vpatryshev.blogspot.com/2012/03/miles-sabins-type-negation-in-practice.html
Using breakOut Use breakOut as the CanBuildFrom and let the typer know what you want your result type to be (unfortunately you need to specify String here) scala> import collection.breakOut import collection.breakOut scala> List(1, 2, 3) res0: List[Int] = List(1, 2, 3) scala> res0.map(_.toString)(breakOut) : Vector[String] res2: Vector[String] = Vector(1, 2, 3) Using to[Collection] (starting … Read more
Yes it is possible (IntelliJ IDEA 11.1.3 CE with Scala Plug-In 0.5.948, but this has been possible for a while). You need to select the receiver not the method itself. For instance, assume dataDir is of type java.io.File. Then I can do dataDir.listFiles().foreach( … ) where foreach is available through implicit conversion from Array to … Read more
The solution linked to by @pagoda_5b works: Scala convert List[Int] to a java.util.List[java.lang.Integer] scala> import collection.JavaConversions._ import collection.JavaConversions._ scala> val m = mapAsJavaMap(Map(1 -> 2.1f)).asInstanceOf[java.util.Map[java.lang.Integer, java.lang.Float]] m: java.util.Map[Integer,Float] = {1=2.1} scala> m.get(1).getClass res2: Class[_ <: Float] = class java.lang.Float
Clang is diagnosing under these paragraphs [stmt.if] (emphasis mine) 2 If the if statement is of the form if constexpr, the value of the condition shall be a contextually converted constant expression of type bool; this form is called a constexpr if statement. [expr.const] 4 A converted constant expression of type T is an expression, … Read more
Is there any way to disable implicit conversion to void* for pointers to a certain class? No, you can’t prevent the implicit conversion, but you could wrap the API function(s) in proxy functions that checks types at compile time and approve/disapprove them there. Example: #include <iostream> #include <string> #include <type_traits> void api(void* p) { // … Read more
I think you defined your GroupNames as Dictionary<string,string>, so you need to add ToDictionary like this: GroupNames = GroupNames.Concat(AddedGroupNames) .ToDictionary(x=>x.Key,x=>x.Value); Note that 2 original dictionaries would have different keys, otherwise we need some rule to merge them correctly.
When you do uint16_t(2)+int16_t(-3), both operands are types that are smaller than int. Because of this, each operand is promoted to an int and signed + signed results in a signed integer and you get the result of -1 stored in that signed integer. When you do uint32_t(2)+int32_t(-3), since both operands are the size of … Read more