//-------------------------------------------------------------------------------------
// scoped.h
//  
// Utility header with helper classes for exception-safe handling of resources
//
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF
// ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
// PARTICULAR PURPOSE.
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//-------------------------------------------------------------------------------------

#if defined(_MSC_VER) && (_MSC_VER > 1000)
#pragma once
#endif

#include <assert.h>
#include <memory>
#include <malloc.h>

//---------------------------------------------------------------------------------
struct aligned_deleter { void operator()(void* p) { _aligned_free(p); } };

typedef std::unique_ptr<float, aligned_deleter> ScopedAlignedArrayFloat;
typedef std::unique_ptr<DirectX::XMVECTOR, aligned_deleter> ScopedAlignedArrayXMVECTOR;

//---------------------------------------------------------------------------------
struct handle_closer { void operator()(HANDLE h) { assert(h != INVALID_HANDLE_VALUE); if (h) CloseHandle(h); } };

typedef public std::unique_ptr<void, handle_closer> ScopedHandle;

inline HANDLE safe_handle( HANDLE h ) { return (h == INVALID_HANDLE_VALUE) ? 0 : h; }


//---------------------------------------------------------------------------------
template<class T> class ScopedObject
{
public:
    explicit ScopedObject( T *p = 0 ) : _pointer(p) {}
    ~ScopedObject()
    {
        if ( _pointer )
        {
            _pointer->Release();
            _pointer = nullptr;
        }
    }

    bool IsNull() const { return (!_pointer); }

    T& operator*() { return *_pointer; }
    T* operator->() { return _pointer; }
    T** operator&() { return &_pointer; }

    void Reset(T *p = 0) { if ( _pointer ) { _pointer->Release(); } _pointer = p; }

    T* Get() const { return _pointer; }

private:
    ScopedObject(const ScopedObject&);
    ScopedObject& operator=(const ScopedObject&);
        
    T* _pointer;
};