wholivesinapineappleunderthesea

// https://web.archive.org/web/20120401132446/http://bloglitb.blogspot.com/2011/12/access-to-private-members-safer.html
// This technique was invented by litb in 2010, long before
// templates were supercharged in C++17. Inspired by this method, I have
// reimplemented it using more modern C++ features.
//
// https://www.youtube.com/watch?v=SmlLdd1Q2V8
/*
14.7.2p8 The usual access checking rules do not apply to names used to specify
explicit instantiations. [Note: In particular, the template arguments and names
used in the function declarator (including parameter types, return types and

wholivesinapineappleunderthesea

#pragma once

#include <Unknwn.h>

#include <exception>

template <typename T> struct COMPtrOut
{
	inline COMPtrOut() = delete;
	inline COMPtrOut(const COMPtrOut&) = delete;

wholivesinapineappleunderthesea

static void* allocate_in_32bits(uint32_t start, uint32_t sz) {
	if (!sz) return NULL;
	MEMORY_BASIC_INFORMATION mbi = { 0 };
	char* min = (char*)start;
	char* max = (char*)UINT32_MAX - sz;
	while (min < max) {
		if (!VirtualQuery(min, &mbi, sizeof mbi)) return NULL;
		if (mbi.State == MEM_FREE && mbi.RegionSize > sz && mbi.BaseAddress) {
			void* alloc = VirtualAlloc(mbi.BaseAddress, sz, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
			if ((uint64_t)alloc > UINT32_MAX) { VirtualFree(alloc, 0, MEM_RELEASE); return NULL; }