generics - How can I use Scala's Manifest class to instantiate the erased class at runtime? -

i'm doing webdriver+pageobject stuff.

(if not familiar pageobjects, pattern have class representing each page on site exposes functions of page using domain language, hiding html stuff test.)

i want lazy , have 1 'submit' method in abstract page class other pages extend from. want method new next page subclass , return it.

here have in page class:

def submitexpecting[p <: page[p]](implicit m: manifest[_]): p = {   driver.findelement(by.xpath("//input[@type='submit']")).click   m.erasure.getconstructor(classof[webdriver]).newinstance(driver).asinstanceof[p] } 

and here's how i'm calling it:

val userhomepage = usersignuppage       .login("graham")       .accepttermsandconditions       .submitexpecting[userhomepage] 

compiling this, get:

error: not find implicit value parameter m: manifest[_] .submitexpecting[userhomepage] 

i thought being smart, i'm not. ;) doing wrong?

you need make manifest related type parameter, i.e.

def submitexpecting[p <: page[p]](implicit m: manifest[p]): p