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Re: Compile time errors

From: Paul Pluzhnikov
Subject: Re: Compile time errors
Date: 01 Nov 2004 07:25:58 -0800
User-agent: Gnus/5.0808 (Gnus v5.8.8) XEmacs/21.4 (Artificial Intelligence) (Vineet) writes:

> I am quite puzzled with this seemingly basic issue while compiling.

You do not have an issue while compiling. You have an issue while

> BufMgr.o(.text+0x0): In function `lru::lru[not-in-charge]()':
> : multiple definition of `lru::lru[not-in-charge]()'
> TDD.o(.text+0x0): first defined here

In lru.h, you have code like this:

  class lru { lru(); ... };
  lru::lru() { ... }

With the code above, every source file that #include's lru.h is
going to *define* 'lru::lru()', resulting in multiple definitions
and a link error.

You have to make 'lru::lru()' inline:

  class lru { inline lru(); ... };

or you have to move the definition of 'lru::lru()' out of the header
and into its own source file; so it is defined in lru.o and
nowhere else. [Obviously you'll have to add lru.o to your link line].

In order to understand recursion you must first understand recursion.
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