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Side by Side Diff: mojo/application/public/cpp/lazy_interface_ptr.h

Issue 1565343003: Move mojo/application/public -> mojo/shell/public (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@fetcher
Patch Set: . Created 4 years, 11 months ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef MOJO_APPLICATION_PUBLIC_CPP_LAZY_INTERFACE_PTR_H_
6 #define MOJO_APPLICATION_PUBLIC_CPP_LAZY_INTERFACE_PTR_H_
7
8 #include "mojo/application/public/cpp/connect.h"
9 #include "mojo/application/public/interfaces/service_provider.mojom.h"
10
11 namespace mojo {
12
13 // An InterfacePtr that will request an implementation from a specified
14 // ServiceProvider when it is first accessed with the get() method.
15 template <typename Interface>
16 class LazyInterfacePtr : public InterfacePtr<Interface> {
17 public:
18 LazyInterfacePtr() : service_provider_(nullptr) {}
19
20 explicit LazyInterfacePtr(ServiceProvider* service_provider)
21 : service_provider_(service_provider) {}
22
23 void set_service_provider(ServiceProvider* service_provider) {
24 if (service_provider != service_provider_) {
25 InterfacePtr<Interface>::reset();
26 }
27 service_provider_ = service_provider;
28 }
29
30 Interface* get() const {
31 if (!InterfacePtr<Interface>::get() && service_provider_) {
32 mojo::ConnectToService<Interface>(
33 service_provider_, const_cast<LazyInterfacePtr<Interface>*>(this));
34 }
35 return InterfacePtr<Interface>::get();
36 }
37 Interface* operator->() const { return get(); }
38 Interface& operator*() const { return *get(); }
39
40 private:
41 ServiceProvider* service_provider_;
42 };
43
44 } // namespace mojo
45
46 #endif // MOJO_APPLICATION_PUBLIC_CPP_LAZY_INTERFACE_PTR_H_
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