Kotlin generic function sample

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.content.Intent
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    companion object {
        val PERMISSIONS_REQUEST_READ_CONTACTS = 100    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        button1.setOnClickListener {            startActivity { ProviderContactContract::class.java }        }
        button2.setOnClickListener {            startActivity { ProviderMediaStore::class.java }        }
    }

    private fun <T : Any?> startActivity(clazz: () -> Class<T>) {
        val intent = Intent(this, clazz())
        startActivity(intent)
    }
}