Woocommerce hide add to cart button for non logged in users but show stock.

wchacbfnliu.php

//Hide add to cart button for non logged in users but show stock.

function hide_add_to_cart_for_non_logged_in_users() {
    if (!is_user_logged_in()) {
       ?>
        <style>
           form.cart {
                display: none;
            }
        </style>
        <div class="login-to-purchase">
           <p>Please <a href="<?php echo get_permalink(get_option('woocommerce_myaccount_page_id'));?>">log in or register</a> to purchase this product.</p>
        </div>
        <?php
    }
}
add_action('woocommerce_single_product_summary', 'hide_add_to_cart_for_non_logged_in_users');

For reddit request : https://www.reddit.com/r/woocommerce/comments/1c7vxrk/lock_add_to_basket_button_until_logged_in_but/