Auto generated instance codes through 'deriving'

Jong Keun Na jongkn@microsoft.com
Fri, 7 Feb 2003 15:14:44 +0900


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Hello folks,

Is there any method with which I can see instance's codes generated
automatically by using 'deriving' keyword in GHC?
I'm curious in how GHC generates 'Read' class's instance code for
user-defined data type.
Any help will be great appreciated.

/JongKeun

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<TITLE>Auto generated instance codes through 'deriving'</TITLE>
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<P ALIGN=3DJUSTIFY><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma">Hello folks,</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P ALIGN=3DJUSTIFY><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma">Is there any method</FONT></SPAN><SPAN LANG=3D"en-us"> =
<FONT SIZE=3D2 FACE=3D"Tahoma">with which I can see</FONT></SPAN><SPAN =
LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Tahoma">instance</FONT></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Tahoma">&#8217;</FONT></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Tahoma">s</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT =
SIZE=3D2 FACE=3D"Tahoma">codes</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT =
SIZE=3D2 FACE=3D"Tahoma">generated automatically</FONT></SPAN><SPAN =
LANG=3D"en-us"> <FONT SIZE=3D2 FACE=3D"Tahoma">by =
using</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Tahoma">&#8216;</FONT></SPAN><SPAN LANG=3D"en-us"><B><FONT =
SIZE=3D2 FACE=3D"Tahoma">deriving</FONT></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">&#8217;</FONT></B></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Tahoma"> keyword in GHC?</FONT></SPAN><SPAN =
LANG=3D"en-us"></SPAN></P>

<P ALIGN=3DJUSTIFY><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma">I</FONT></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma">&#8217;</FONT></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma">m curious in how GHC generates</FONT></SPAN><SPAN =
LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Tahoma">&#8216;</FONT></SPAN><SPAN LANG=3D"en-us"><B><FONT =
SIZE=3D2 FACE=3D"Tahoma">Read</FONT></B></SPAN><SPAN =
LANG=3D"en-us"><B><FONT SIZE=3D2 =
FACE=3D"Tahoma">&#8217;</FONT></B></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Tahoma"></FONT></SPAN><SPAN LANG=3D"en-us"> <FONT =
SIZE=3D2 FACE=3D"Tahoma">class</FONT></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Tahoma">&#8217;</FONT></SPAN><SPAN LANG=3D"en-us"><FONT =
SIZE=3D2 FACE=3D"Tahoma">s</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT =
SIZE=3D2 FACE=3D"Tahoma">instance code for</FONT></SPAN><SPAN =
LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Tahoma">user-defined</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT =
SIZE=3D2 FACE=3D"Tahoma">data type</FONT></SPAN><SPAN =
LANG=3D"en-us"><FONT SIZE=3D2 FACE=3D"Tahoma">.</FONT></SPAN></P>

<P ALIGN=3DJUSTIFY><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma">Any</FONT> <FONT SIZE=3D2 =
FACE=3D"Tahoma">help</FONT><FONT SIZE=3D2 FACE=3D"Tahoma"> will =
be</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Tahoma">great</FONT></SPAN><SPAN LANG=3D"en-us"> <FONT SIZE=3D2 =
FACE=3D"Tahoma">apprecia</FONT><FONT SIZE=3D2 =
FACE=3D"Tahoma">ted</FONT></SPAN><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma">.</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

<P ALIGN=3DJUSTIFY><SPAN LANG=3D"en-us"><FONT SIZE=3D2 =
FACE=3D"Tahoma">/</FONT><FONT SIZE=3D2 =
FACE=3D"Tahoma">JongKeun</FONT></SPAN><SPAN LANG=3D"en-us"></SPAN></P>

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