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doc on overloading

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aarne
2006-11-17 14:39:02 +00:00
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@@ -14,6 +14,18 @@ Changes in functionality since May 17, 2005, release of GF Version 2.2
<p>
17/11 (AR) Operation overloading: an <tt>oper</tt> can have many types,
from which one is picked at compile time. The types must have different
argument lists. Exact match with the arguments given to the <tt>oper</tt>
is required. An example is given in
<a href="../lib/resource-1.0/common/Overload.gf"><tt>Overload.gf</tt></a>.
The purpose of overloading is to make libraries easier to use, since
only one name for each grammatical operation is needed: predication, modification,
coordination, etc. The concrete syntax is, at this experimental level, not
extended but relies on using a record with the function name repeated
as label name (see the example). The treatment of overloading is inspired
by C++, and was first suggested by Björn Nringert.
<p>