Declaration
Presense
The Magento\Customer\Block\Account\SortLinkInterface
has been added on 2016-10-17 to Magento 2.2, it is absent in Magento 2.0 and 2.1.
https://github.com/magento/magento2/commit/95d3148fe
Implementations
1. Magento\Customer\Block\Account\SortLink (the default implementation)
This implementation is default:
https://github.com/magento/magento2/blob/6086595c/app/code/Magento/Customer/etc/di.xml#L60-L61
2. Magento\Customer\Block\Account\AuthorizationLink
3. Magento\Customer\Block\Account\Delimiter
4. Magento\Customer\Block\Account\Link
5. Magento\Wishlist\Block\Link
https://github.com/magento/magento2/blob/6086595c/app/code/Magento/Wishlist/Block/Link.php#L14-L20