There should be a get_next_post_link() and get_previous_post_link()

[Master Jake]

You can do this with the plural form: get_next_posts_link() and get_previous_posts_link() so there might as well be a getter for singular posts. I often find I need to easily check for a previous or next post anyway before outputting something, and this would be the simplest way of doing that.

[Master Jake]

Perfect backwards compatibility maintained with previous_post_link, next_post_link, and adjacent_post_link!

[ocean90]

#17302