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Re: [Help-glpk] const char *

From: Andrew Makhorin
Subject: Re: [Help-glpk] const char *
Date: Sat, 19 Jun 2004 15:00:42 +0400

>A number of the GLPK API functions (e.g.
>lpx_read_model) take char * arguments, where 
>const char * would seem more appropriate. 
>Why is this? Is there some reason why these 
>functions may modify the given string? Am I 
>missing something here? It is somewhat 
>irritating, because if I pass them a string 
>declared const char * I get a compiler warning 
>about discarding qualifiers.

`const' qualifiers are not used for portability reasons (Glpk is
written in a subset of ISO C which does not include such feature).
If you need to get rid of compiler warnings, you might use explicit
type conversion as follows:

   void foo(const char *filename)
      ret = lpx_read_mps((char *)filename);

(or do not use const's at all :+)

Andrew Makhorin

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