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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_WIN_SCOPED_CO_MEM_H_
#define BASE_WIN_SCOPED_CO_MEM_H_
#include <objbase.h>
#include <utility>
#include "base/check.h"
#include "base/memory/raw_ptr_exclusion.h"
namespace base {
namespace win {
// Simple scoped memory releaser class for COM allocated memory.
// Example:
// base::win::ScopedCoMem<ITEMIDLIST> file_item;
// SHGetSomeInfo(&file_item, ...);
// ...
// return; <-- memory released
template <typename T>
class ScopedCoMem {
public:
ScopedCoMem() : mem_ptr_(nullptr) {}
ScopedCoMem(const ScopedCoMem&) = delete;
ScopedCoMem& operator=(const ScopedCoMem&) = delete;
ScopedCoMem(ScopedCoMem&& other)
: mem_ptr_(std::exchange(other.mem_ptr_, nullptr)) {}
ScopedCoMem& operator=(ScopedCoMem&& other) {
Reset(std::exchange(other.mem_ptr_, nullptr));
return *this;
}
~ScopedCoMem() { Reset(nullptr); }
T** operator&() { // NOLINT
DCHECK(mem_ptr_ == nullptr); // To catch memory leaks.
return &mem_ptr_;
}
operator T*() { return mem_ptr_; }
T* operator->() {
DCHECK(mem_ptr_ != NULL);
return mem_ptr_;
}
const T* operator->() const {
DCHECK(mem_ptr_ != NULL);
return mem_ptr_;
}
void Reset(T* ptr) {
if (mem_ptr_) {
CoTaskMemFree(mem_ptr_);
}
mem_ptr_ = ptr;
}
T* get() const { return mem_ptr_; }
private:
// RAW_PTR_EXCLUSION: This memory is handled by the OS instead
// of PartitionAlloc, so there's no point rewriting it to a
// raw_ptr
RAW_PTR_EXCLUSION T* mem_ptr_;
};
} // namespace win
} // namespace base
#endif // BASE_WIN_SCOPED_CO_MEM_H_
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