# What is the function of false in the Program fragment?

**URL:** <https://www.ruby-forum.com/t/what-is-the-function-of-false-in-the-program-fragment/192920>\
**Category:** Ruby-Gnome 2\
**Created:** [August 8, 2010, 2:20pm UTC](https://www.ruby-forum.com/t/what-is-the-function-of-false-in-the-program-fragment/192920 "2010-08-08T14:20:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\
**Post date:** [August 8, 2010, 2:20pm UTC](https://www.ruby-forum.com/t/what-is-the-function-of-false-in-the-program-fragment/192920/1 "2010-08-08T14:20:46Z")

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there is a Program fragment:  
window.signal\_connect(‘delete\_event’) do  
Gtk.main\_quit  
false  
end

when i drop “false” :

window.signal\_connect(‘delete\_event’) do  
Gtk.main\_quit  
end

it can run too,what is the function of false here?

---

<div class="post-metadata">

**Author:** ![luofeiyu](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/9de0a6/32.png) [@luofeiyu](https://www.ruby-forum.com/u/luofeiyu)\
**Post date:** [August 8, 2010, 6:07pm UTC](https://www.ruby-forum.com/t/what-is-the-function-of-false-in-the-program-fragment/192920/2 "2010-08-08T18:07:08Z")

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Hi.

If you return FALSE in the “delete\_event” signal handler,  
GTK will emit the “destroy” signal. Returning TRUE means you don’t  
want the window to be destroyed.  
This is useful for popping up ‘are you sure you want to quit?’ type  
dialogs.

–  
Vincent C.

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