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+//
+// detail/impl/buffer_sequence_adapter.ipp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef ASIO_DETAIL_IMPL_BUFFER_SEQUENCE_ADAPTER_IPP
+#define ASIO_DETAIL_IMPL_BUFFER_SEQUENCE_ADAPTER_IPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+
+#if defined(ASIO_WINDOWS_RUNTIME)
+
+#include <robuffer.h>
+#include <windows.storage.streams.h>
+#include <wrl/implements.h>
+#include "asio/detail/buffer_sequence_adapter.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class winrt_buffer_impl :
+ public Microsoft::WRL::RuntimeClass<
+ Microsoft::WRL::RuntimeClassFlags<
+ Microsoft::WRL::RuntimeClassType::WinRtClassicComMix>,
+ ABI::Windows::Storage::Streams::IBuffer,
+ Windows::Storage::Streams::IBufferByteAccess>
+{
+public:
+ explicit winrt_buffer_impl(const asio::const_buffer& b)
+ {
+ bytes_ = const_cast<byte*>(static_cast<const byte*>(b.data()));
+ length_ = b.size();
+ capacity_ = b.size();
+ }
+
+ explicit winrt_buffer_impl(const asio::mutable_buffer& b)
+ {
+ bytes_ = static_cast<byte*>(b.data());
+ length_ = 0;
+ capacity_ = b.size();
+ }
+
+ ~winrt_buffer_impl()
+ {
+ }
+
+ STDMETHODIMP Buffer(byte** value)
+ {
+ *value = bytes_;
+ return S_OK;
+ }
+
+ STDMETHODIMP get_Capacity(UINT32* value)
+ {
+ *value = capacity_;
+ return S_OK;
+ }
+
+ STDMETHODIMP get_Length(UINT32 *value)
+ {
+ *value = length_;
+ return S_OK;
+ }
+
+ STDMETHODIMP put_Length(UINT32 value)
+ {
+ if (value > capacity_)
+ return E_INVALIDARG;
+ length_ = value;
+ return S_OK;
+ }
+
+private:
+ byte* bytes_;
+ UINT32 length_;
+ UINT32 capacity_;
+};
+
+void buffer_sequence_adapter_base::init_native_buffer(
+ buffer_sequence_adapter_base::native_buffer_type& buf,
+ const asio::mutable_buffer& buffer)
+{
+ std::memset(&buf, 0, sizeof(native_buffer_type));
+ Microsoft::WRL::ComPtr<IInspectable> insp
+ = Microsoft::WRL::Make<winrt_buffer_impl>(buffer);
+ buf = reinterpret_cast<Windows::Storage::Streams::IBuffer^>(insp.Get());
+}
+
+void buffer_sequence_adapter_base::init_native_buffer(
+ buffer_sequence_adapter_base::native_buffer_type& buf,
+ const asio::const_buffer& buffer)
+{
+ std::memset(&buf, 0, sizeof(native_buffer_type));
+ Microsoft::WRL::ComPtr<IInspectable> insp
+ = Microsoft::WRL::Make<winrt_buffer_impl>(buffer);
+ Platform::Object^ buf_obj = reinterpret_cast<Platform::Object^>(insp.Get());
+ buf = reinterpret_cast<Windows::Storage::Streams::IBuffer^>(insp.Get());
+}
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // defined(ASIO_WINDOWS_RUNTIME)
+
+#endif // ASIO_DETAIL_IMPL_BUFFER_SEQUENCE_ADAPTER_IPP