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winrt::copy_from_abi function (C++/WinRT)

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A helper function that copies to a C++/WinRT object from a handle, or from a raw pointer. Clears the C++/WinRT object, or decrements the reference count on any currently referenced interface, copies the parameter, and begins managing the handle or interface pointed to by it (which includes incrementing any reference count on the parameter). For more info, and code examples, see Interop between C++/WinRT and the ABI.

Syntax

template <typename T, typename V, typename =
std::enable_if_t<!std::is_base_of_v<winrt::Windows::Foundation::IUnknown, T>>>
void copy_from_abi(T& object, V&& value);

void copy_from_abi(winrt::hstring& object, void* value);

void copy_from_abi(winrt::Windows::Foundation::IUnknown& object, void* value) noexcept;

Parameters

object A C++/WinRT object to operate on.

value A handle, or a raw pointer to a target whose lifetime should be managed by the C++/WinRT object. In the case of the IUnknown&, void* overload, the function calls AddRef on value.

Requirements

Minimum supported SDK: Windows SDK version 10.0.17134.0 (Windows 10, version 1803)

Namespace: winrt

Header: %WindowsSdkDir%Include<WindowsTargetPlatformVersion>\cppwinrt\winrt\base.h (included by default)

See also