traits

I want to override abstract type in trait with <: and not with = (like answer here Scala Upper Bounds : value is not a member of type parameter ). I want to use cake pattern, but this doesn't work, i don't understand why ? trait A { def ping = println("ping") } trait Cake { type T } trait S { this: Cake => type T = A def t: T t.ping } OK, this example run, but in my real use case i want to override type with <: and not with = .It seems impossible to access the t function, why ? trait S { this: Cake => type T <: A def t: T t.ping } return an error value ping is not a member of S.this.T It's a

In Rust, tuple structs with only one field can be created like the following: struct Centimeters(i32); I want to do basic arithmetic with Centimeters without extracting their "inner" values every time with pattern matching, and without implementing the Add , Sub , ... traits and overloading operators. What I want to do is: let a = Centimeters(100); let b = Centimeters(200); assert_eq!(a + a, b); huon is there a way to do it without extracting their "inner" values every time with pattern matching, and without implementing the Add, Sub, ... traits and overloading operators? No, the only way is

I have difficulties in understanding the linearization order in Scala when working with traits: class A { def foo() = "A" } trait B extends A { override def foo() = "B" + super.foo() } trait C extends B { override def foo() = "C" + super.foo() } trait D extends A { override def foo() = "D" + super.foo() } object LinearizationPlayground { def main(args: Array[String]) { var d = new A with D with C with B; println(d.foo) // CBDA???? } } It prints CBDA but I can't figure out why. How is the order of the traits determined? Thx An intuitive way to reason about linearisation is to refer to the

Traits have been one of the biggest additions for PHP 5.4. I know the syntax and understand the idea behind traits, like horizontal code re-use for common stuff like logging, security, caching etc. However, I still don't know how I would make use of traits in my projects. Are there any open source projects that already use traits? Any good articles/reading material on how to structure architectures using traits? My personal opinion is that there is actually very little application for traits when writing clean code. Instead of using traits to hack code into a class it is better to pass in the