Delete operator of a custom memory allocator

[cflaviu]

I'm working on a custom memory allocator but the operator delete, redefined in a base class, is not called only on Symbian. Instead the global delete operator is called. This code is 100% pure C++ and I don't know way I receive the warning: "cannot find matching deallocation function for 'A'". I'm using the S60 3rd Edition MR SDK. What can I do to solve this issue?

#ifndef __SYMBIAN32__
	#include <stdlib.h>
#endif

class A
{ 
public:
	virtual ~A() {} // A has descendents

	#ifdef __SYMBIAN32__
		void* operator new ( unsigned n, char* /*fileName*/, int /*line*/)	{ return User::Alloc( n); }
		void operator delete( void* p) { User::Free( p); }
		// tried also: void operator delete( void* p, unsigned /*s*/) { User::Free( p); }
	#else
		void* operator new ( unsigned n, char* /*fileName*/, int /*line*/)	{ return malloc( n); }
		void operator delete( void* p) { free( p); }
		// tried also: void operator delete( void* p, unsigned /*s*/) { free( p); }
	#endif
};

void test()
{
	A* p = new (__FILE__, __LINE__) A();
	delete p;
};


int main()
{
	test();
	return 0;
}

I also made a DLL that exports the operators. Again I received at the compile time the same warning "cannot find matching deallocation function for 'A'". When I try to run an application that uses the DLL, the emulator gives an error "epoc.exe has triggered a breakpoint" and then it exits.

        1    ??2A@@SAPAXIPADH@Z (public: static void * __cdecl A::operator new(unsigned int,char *,int))
        2    ??3A@@SAXPAX@Z (public: static void __cdecl A::operator delete(void *))
        3    ??3A@@SAXPAXI@Z (public: static void __cdecl A::operator delete(void *,unsigned int))

[david.caabeiro]

As you provide placement new, you should provide placement delete too. As a simple test, just overload normal new/delete and see what happens.

[david.caabeiro]

(In case you wonder, "placement delete" is called when an exception is thrown during object construction)

[cflaviu]

Thank's a lot! The problems is solved!