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another simple linker error

Started by exorcist_bob Apr 29, 2006 at 8:20 AM 0 replies 950+ views

Original Post

Apr 29, 2006 at 8:20 AM

Hello, I get the following linker error for what seems to be no reason at all. 1>SWPBase.obj : error LNK2001: unresolved external symbol "void __cdecl SkepWorks::Memory::Free(void *,unsigned int)" (?Free@Memory@SkepWorks@@YAXPAXI@Z) It only happens when I uncomment this line:


#pragma once
#include "SWMemory.h"

namespace SkepWorks
{
	class SWPBase
	{
	public:
		SWPBase(void);
	public:
		virtual ~SWPBase(void);

		void *operator new (size_t size) { return Memory::Alloc (size); }
		//void operator delete (void *ptr, size_t size) { Memory::Free (ptr,size); } //this line
		void *operator new[] (size_t size) { return Memory::Alloc (size); }
		void operator delete[] (void *ptr, size_t size) { Memory::Free (ptr,size); }
	};
}

Why is it being so erratic? There are no errors in my operator delete[] function that uses the exact same function. SWMemory.h:


#include "SkepWorks.h"

namespace SkepWorks
{
	namespace Memory
	{
		//more functions
		SkepWorksExport void Free (void *ptr, size_t size);
	};
}


void Free (void *ptr, size_t size)
{
  if (!ptr)
	  return;

  if (freefn)
	  freefn (ptr,size); 
  else 
	  free (ptr);
}

Thanks for any assistance, exorcist_bob

mikeman

Apr 29, 2006 at 9:21 AM

If you look closely, you'll see that the definition(implementation) of Free() is outside of the SkepWorks::Memory namespace. So it's natural that the linker doesn't find the function SkepWorks::Memory::Free(), because it simply doesn't exist. The reason that the error rises only on "operator delete" is probably that you don't have a call to "operator delete[]" in your program, and so the compiler optimizes: If there is an unresolved reference inside a member function that is never used anyway, it just doesn't complain(at least that's what my compiler does).

Just put the definition of Free() inside the correct namespace.

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