Commit 7ea8e692 authored by Geoffrey Métais's avatar Geoffrey Métais

Util class to create singleton with argument

parent cdb1da17
/*******************************************************************************
* SingletonHolder.kt
* ****************************************************************************
* Copyright © 2018 VLC authors and VideoLAN
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
******************************************************************************/
package org.videolan.tools
open class SingletonHolder<out T, in A>(creator: (A) -> T) {
private var creator: ((A) -> T)? = creator
@Volatile private var instance: T? = null
fun getInstance(arg: A) = instance ?: synchronized(this) {
val i2 = instance
if (i2 != null) i2
else {
val created = creator!!(arg)
instance = created
creator = null
created
}
}
}
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment