Access violation reading void* assigned dynamically allocated value inside function

[Tanaka]

Hi guys,

I'm hoping someone can explain the behavior of this code for me. I don't understand why the void pointer passed to testb doesn't continue pointing to the allocated integer after the function call returns.

#include <stdio.h>
#include <iostream>

void* testa()
{
	return new int(1);
}

void testb(void* test)
{
	test = (void*) new int(2);

	printf("Value of void* in testb: %u\n", *static_cast<unsigned int*>(test)); // okay
}

int _tmain(int argc, _TCHAR* argv[])
{
	void* testaptr = testa();
	printf("Value of void*: %u\n", *static_cast<unsigned int*>(testaptr)); // okay

	void* testbptr = nullptr;
	testb(testbptr);
	printf("Value of void*: %u\n", *static_cast<unsigned int*>(testbptr)); // access violation reading testbptr

	getchar();

	return 0;
}

Thanks a lot.