Random number generators

[somyasinha]

Hi,

How do I use the generator in the file? I keep randomc.h as a header file in the Visual c++ project. My project has several header files and several .cpp files, many of which require to use the random no. generator. I have copied all the files in the zip folder into the folder for my project files.
Do I write this in each file that uses the generator?

#ifndef MULTIFILE_PROJECT
// If compiled as a single file then include these cpp files, 
// If compiled as a project then compile and link in these cpp files.
   // Include code for the chosen random number generator:
   #include "mersenne.cpp"
   // define system specific user interface:
   #include "userintf.cpp"
#endif


#include <time.h>                      // define time()
#include "randomc.h"

The compling is ok. But I get a lot of linking errors, e.g.,

GABaseSolver.obj : error LNK2005: "private: void __thiscall CRandomMersenne::Init0(int)" (?Init0@CRandomMersenne@@AAEXH@Z) already defined in GA1DArraySolution.obj

Please help.

[NathanOliver]

in every header file it is a good idea to use inclusion guards. so to stop it from getting defined all the time just put

#ifndef RANDOMC_H
#define RANDOMC_H
//  all the code in randomc.h goes here
#endif

this will make sure that the file is only included the first time and every other time #include "randomc.h" is encountered the compiler will skip that file because it is already defined. I've found this makes things easier down the road and saves some debugging time.

[u8sand]

Some compilers that are stupid the gaurds still wont work, if that is so try using pragma once at the top.

#pragma once