Re: Linking errors after moving to SSQLSs, macro problem - William F. Dowling - com.mysql.lists.plusplus

20 messages in com.mysql.lists.plusplusRe: Linking errors after moving to SS...

From	Sent On	Attachments
Simon Pickles	12 Dec 2007 14:16
William F. Dowling	12 Dec 2007 14:26
Warren Young	12 Dec 2007 14:34
Simon Pickles	16 Dec 2007 14:22
Warren Young	17 Dec 2007 05:56
Simon Pickles	17 Dec 2007 11:59
Warren Young	17 Dec 2007 13:19
Simon Pickles	17 Dec 2007 14:11
Joel Fielder	17 Dec 2007 14:36
Drew M.	17 Dec 2007 15:26
Simon Pickles	18 Dec 2007 00:07
Warren Young	18 Dec 2007 10:15
Warren Young	18 Dec 2007 10:19
Warren Young	18 Dec 2007 10:25
Simon Pickles	18 Dec 2007 12:42
Warren Young	18 Dec 2007 13:47
Jim	19 Dec 2007 03:50
Warren Young	19 Dec 2007 08:45
Jim	20 Dec 2007 03:50
Warren Young	20 Dec 2007 18:16

Subject:	Re: Linking errors after moving to SSQLSs, macro problem
From:	William F. Dowling (will...@thomson.com)
Date:	12/12/2007 02:26:07 PM
List:	com.mysql.lists.plusplus

One way is

#define SOME_SYMBOL in just one .cpp file that will include databasesstructs.h.

Then in databasesstructs.h

#ifndef DATABASESTRUCTS_H #define DATABASESTRUCTS_H

#ifdef SOME_SYMBOL #include <mysql++.h> #include <custom.h>

sql_create_4( PlayerSQL, 1, 0, unsigned int, PLAYER_ID, std::string, PLAYER_NAME, unsigned int, PLAYER_OBJECTID, unsigned int, PLAYER_ZONE ); #endif

#endif

On Wed, 2007-12-12 at 22:16 +0000, Simon Pickles wrote:

Hi,

My app was building and running without using SSQLS, but seeing the simplicity and extra functionality they afford, I moved to SSQLS. Unfortunately, this generates a string of linker errors now, due to multiple definitions.

This is, I think, because I have declared the SSQLS using a macro in a header file. To use the resulting data structure I have been including the header file, but this runs the macro repeatedly of course.

Eg:

#ifndef DATABASESTRUCTS_H #define DATABASESTRUCTS_H

#include <mysql++.h> #include <custom.h>

sql_create_4( PlayerSQL, 1, 0, unsigned int, PLAYER_ID, std::string, PLAYER_NAME, unsigned int, PLAYER_OBJECTID, unsigned int, PLAYER_ZONE ); #endif

What is the correct way to overcome this? I need PlayerManager.cpp and Player.cpp to have PlayerSQL in scope.

Thanks