81 lines
2.6 KiB
C++
81 lines
2.6 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_REQUEST_H_
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#define MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_REQUEST_H_
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#include <string>
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#include <utility>
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#include "base/macros.h"
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#include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
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namespace mojo {
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// AssociatedInterfaceRequest represents an associated interface request. It is
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// similar to InterfaceRequest except that it doesn't own a message pipe handle.
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template <typename Interface>
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class AssociatedInterfaceRequest {
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public:
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// Constructs an empty AssociatedInterfaceRequest, representing that the
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// client is not requesting an implementation of Interface.
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AssociatedInterfaceRequest() {}
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AssociatedInterfaceRequest(decltype(nullptr)) {}
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explicit AssociatedInterfaceRequest(ScopedInterfaceEndpointHandle handle)
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: handle_(std::move(handle)) {}
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// Takes the interface endpoint handle from another
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// AssociatedInterfaceRequest.
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AssociatedInterfaceRequest(AssociatedInterfaceRequest&& other) {
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handle_ = std::move(other.handle_);
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}
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AssociatedInterfaceRequest& operator=(AssociatedInterfaceRequest&& other) {
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if (this != &other)
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handle_ = std::move(other.handle_);
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return *this;
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}
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// Assigning to nullptr resets the AssociatedInterfaceRequest to an empty
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// state, closing the interface endpoint handle currently bound to it (if
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// any).
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AssociatedInterfaceRequest& operator=(decltype(nullptr)) {
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handle_.reset();
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return *this;
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}
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// Indicates whether the request currently contains a valid interface endpoint
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// handle.
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bool is_pending() const { return handle_.is_valid(); }
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explicit operator bool() const { return handle_.is_valid(); }
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ScopedInterfaceEndpointHandle PassHandle() { return std::move(handle_); }
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const ScopedInterfaceEndpointHandle& handle() const { return handle_; }
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bool Equals(const AssociatedInterfaceRequest& other) const {
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if (this == &other)
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return true;
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// Now that the two refer to different objects, they are equivalent if
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// and only if they are both invalid.
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return !is_pending() && !other.is_pending();
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}
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void ResetWithReason(uint32_t custom_reason, const std::string& description) {
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handle_.ResetWithReason(custom_reason, description);
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}
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private:
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ScopedInterfaceEndpointHandle handle_;
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DISALLOW_COPY_AND_ASSIGN(AssociatedInterfaceRequest);
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};
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} // namespace mojo
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#endif // MOJO_PUBLIC_CPP_BINDINGS_ASSOCIATED_INTERFACE_REQUEST_H_
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