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---
layout: default
title: Glossary of Terms
---
**adaptor** *(noun)* - A function which alters a slot’s
signature.
**bind** *(verb)* - To fix a value of a callback's argument in the
STL sense.
**call** *(verb)* - The process of invoking a callback or slot.
**callback** *(noun)* - A function or a member function which will
be called when a signal is emitted. A slot specifies the callback and any extra
data, such as the object instance, and extra parameters.
**connect** *(verb)* - The process of specifying the callback
which will be called when the signal is emitted.
**emit** *(verb)* - When a signal is emitted, the connected slots
will be called.
**factory** *(noun)* - A function which takes a set of arguments and
produces a different object based on those arguments.
**handle** *(noun)* - A safe version of a pointer.
**marshaller** *(noun)* - When a signal has a return value, and
several slots are connected to that signal, each one returning a value, then a
marshaller chooses one single return value.
**safe** *(adj)* - Any structure which falls back into uninitalized state
when its related resources are destroyed. Safe resources can be
held throughout the program. Unsafe resources may point to freed
memory.
**signal** *(noun)* - An object to which callback slots can be
connected. When the signal is emitted, each callback will be invoked. The
signal and the connected slots have a specific return type and parameter types.
**signal handler** *(noun)* - Another name for a callback.
**signature** *(noun)* - The return type of a function together with
the argument types of that function.
**slot** *(noun)* - A safe version of a callback.
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