85 lines
3.6 KiB
C
85 lines
3.6 KiB
C
|
//*********************************************************
|
||
|
|
//
|
||
|
|
// Copyright (c) Microsoft. All rights reserved.
|
||
|
|
// This code is licensed under the MIT License.
|
||
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
|
||
|
|
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
|
||
|
|
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
|
||
|
|
// PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
||
|
|
//
|
||
|
|
//*********************************************************
|
||
|
|
#ifndef __WIL_WRL_INCLUDED
|
||
|
|
#define __WIL_WRL_INCLUDED
|
||
|
|
|
||
|
|
#include <wrl.h>
|
||
|
|
#include "result.h"
|
||
|
|
#include "common.h" // wistd type_traits helpers
|
||
|
|
|
||
|
|
namespace wil
|
||
|
|
{
|
||
|
|
|
||
|
|
#ifdef WIL_ENABLE_EXCEPTIONS
|
||
|
|
#pragma region Object construction helpers that throw exceptions
|
||
|
|
|
||
|
|
/** Used to construct a RuntimeClass based object that uses 2 phase construction.
|
||
|
|
Construct a RuntimeClass based object that uses 2 phase construction (by implementing
|
||
|
|
RuntimeClassInitialize() and returning error codes for failures.
|
||
|
|
~~~~
|
||
|
|
// SomeClass uses 2 phase initialization by implementing RuntimeClassInitialize()
|
||
|
|
auto someClass = MakeAndInitializeOrThrow<SomeClass>(L"input", true);
|
||
|
|
~~~~ */
|
||
|
|
|
||
|
|
template <typename T, typename... TArgs>
|
||
|
|
Microsoft::WRL::ComPtr<T> MakeAndInitializeOrThrow(TArgs&&... args)
|
||
|
|
{
|
||
|
|
Microsoft::WRL::ComPtr<T> obj;
|
||
|
|
THROW_IF_FAILED(Microsoft::WRL::MakeAndInitialize<T>(&obj, Microsoft::WRL::Details::Forward<TArgs>(args)...));
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
|
||
|
|
/** Used to construct an RuntimeClass based object that uses exceptions in its constructor (and does
|
||
|
|
not require 2 phase construction).
|
||
|
|
~~~~
|
||
|
|
// SomeClass uses exceptions for error handling in its constructor.
|
||
|
|
auto someClass = MakeOrThrow<SomeClass>(L"input", true);
|
||
|
|
~~~~ */
|
||
|
|
|
||
|
|
template <typename T, typename... TArgs>
|
||
|
|
Microsoft::WRL::ComPtr<T> MakeOrThrow(TArgs&&... args)
|
||
|
|
{
|
||
|
|
// This is how you can detect the presence of RuntimeClassInitialize() and find dangerous use.
|
||
|
|
// Unfortunately this produces false positives as all RuntimeClass derived classes have
|
||
|
|
// a RuntimeClassInitialize() method from their base class.
|
||
|
|
// static_assert(!std::is_member_function_pointer<decltype(&T::RuntimeClassInitialize)>::value,
|
||
|
|
// "class has a RuntimeClassInitialize member, use MakeAndInitializeOrThrow instead");
|
||
|
|
auto obj = Microsoft::WRL::Make<T>(Microsoft::WRL::Details::Forward<TArgs>(args)...);
|
||
|
|
THROW_IF_NULL_ALLOC(obj.Get());
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
#pragma endregion
|
||
|
|
|
||
|
|
#endif // WIL_ENABLE_EXCEPTIONS
|
||
|
|
|
||
|
|
/** By default WRL Callback objects are not agile, use this to make an agile one. Replace use of Callback<> with MakeAgileCallback<>.
|
||
|
|
Will return null on failure, translate that into E_OUTOFMEMORY using XXX_IF_NULL_ALLOC()
|
||
|
|
from wil\result.h to test the result. */
|
||
|
|
template<typename TDelegateInterface, typename ...Args>
|
||
|
|
::Microsoft::WRL::ComPtr<TDelegateInterface> MakeAgileCallbackNoThrow(Args&&... args) WI_NOEXCEPT
|
||
|
|
{
|
||
|
|
using namespace Microsoft::WRL;
|
||
|
|
return Callback<Implements<RuntimeClassFlags<ClassicCom>, TDelegateInterface, FtmBase>>(wistd::forward<Args>(args)...);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef WIL_ENABLE_EXCEPTIONS
|
||
|
|
template<typename TDelegateInterface, typename ...Args>
|
||
|
|
::Microsoft::WRL::ComPtr<TDelegateInterface> MakeAgileCallback(Args&&... args)
|
||
|
|
{
|
||
|
|
auto result = MakeAgileCallbackNoThrow<TDelegateInterface, Args...>(wistd::forward<Args>(args)...);
|
||
|
|
THROW_IF_NULL_ALLOC(result);
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
#endif // WIL_ENABLE_EXCEPTIONS
|
||
|
|
} // namespace wil
|
||
|
|
|
||
|
|
#endif // __WIL_WRL_INCLUDED
|