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Side by Side Diff: mojo/public/cpp/system/handle.h

Issue 1410053006: Move third_party/mojo/src/mojo/public to mojo/public (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: merge Created 5 years, 1 month ago
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1 // Copyright 2014 The Chromium Authors. All rights reserved. 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 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #ifndef THIRD_PARTY_MOJO_SRC_MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_ 5 #ifndef MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_
6 #define THIRD_PARTY_MOJO_SRC_MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_ 6 #define MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_
7 7
8 #include <assert.h> 8 #include <assert.h>
9 #include <limits> 9 #include <limits>
10 10
11 #include "third_party/mojo/src/mojo/public/c/system/functions.h" 11 #include "mojo/public/c/system/functions.h"
12 #include "third_party/mojo/src/mojo/public/c/system/types.h" 12 #include "mojo/public/c/system/types.h"
13 #include "third_party/mojo/src/mojo/public/cpp/system/macros.h" 13 #include "mojo/public/cpp/system/macros.h"
14 14
15 namespace mojo { 15 namespace mojo {
16 16
17 // OVERVIEW 17 // OVERVIEW
18 // 18 //
19 // |Handle| and |...Handle|: 19 // |Handle| and |...Handle|:
20 // 20 //
21 // |Handle| is a simple, copyable wrapper for the C type |MojoHandle| (which is 21 // |Handle| is a simple, copyable wrapper for the C type |MojoHandle| (which is
22 // just an integer). Its purpose is to increase type-safety, not provide 22 // just an integer). Its purpose is to increase type-safety, not provide
23 // lifetime management. For the same purpose, we have trivial *subclasses* of 23 // lifetime management. For the same purpose, we have trivial *subclasses* of
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41 // |scoped_ptr|). 41 // |scoped_ptr|).
42 // 42 //
43 // |ScopedHandle| is just (a typedef of) a |ScopedHandleBase<Handle>|. 43 // |ScopedHandle| is just (a typedef of) a |ScopedHandleBase<Handle>|.
44 // Similarly, |ScopedMessagePipeHandle| is just a 44 // Similarly, |ScopedMessagePipeHandle| is just a
45 // |ScopedHandleBase<MessagePipeHandle>|. Etc. Note that a 45 // |ScopedHandleBase<MessagePipeHandle>|. Etc. Note that a
46 // |ScopedMessagePipeHandle| is *not* a (subclass of) |ScopedHandle|. 46 // |ScopedMessagePipeHandle| is *not* a (subclass of) |ScopedHandle|.
47 // 47 //
48 // Wrapper functions: 48 // Wrapper functions:
49 // 49 //
50 // We provide simple wrappers for the |Mojo...()| functions (in 50 // We provide simple wrappers for the |Mojo...()| functions (in
51 // third_party/mojo/src/mojo/public/c/system/core.h -- see that file for details on individual 51 // mojo/public/c/system/core.h -- see that file for details on individual
52 // functions). 52 // functions).
53 // 53 //
54 // The general guideline is functions that imply ownership transfer of a handle 54 // The general guideline is functions that imply ownership transfer of a handle
55 // should take (or produce) an appropriate |Scoped...Handle|, while those that 55 // should take (or produce) an appropriate |Scoped...Handle|, while those that
56 // don't take a |...Handle|. For example, |CreateMessagePipe()| has two 56 // don't take a |...Handle|. For example, |CreateMessagePipe()| has two
57 // |ScopedMessagePipe| "out" parameters, whereas |Wait()| and |WaitMany()| take 57 // |ScopedMessagePipe| "out" parameters, whereas |Wait()| and |WaitMany()| take
58 // |Handle| parameters. Some, have both: e.g., |DuplicatedBuffer()| takes a 58 // |Handle| parameters. Some, have both: e.g., |DuplicatedBuffer()| takes a
59 // suitable (unscoped) handle (e.g., |SharedBufferHandle|) "in" parameter and 59 // suitable (unscoped) handle (e.g., |SharedBufferHandle|) "in" parameter and
60 // produces a suitable scoped handle (e.g., |ScopedSharedBufferHandle| a.k.a. 60 // produces a suitable scoped handle (e.g., |ScopedSharedBufferHandle| a.k.a.
61 // |ScopedHandleBase<SharedBufferHandle>|) as an "out" parameter. 61 // |ScopedHandleBase<SharedBufferHandle>|) as an "out" parameter.
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280 return MojoClose(handle.value()); 280 return MojoClose(handle.value());
281 } 281 }
282 282
283 // Strict weak ordering, so that |Handle|s can be used as keys in |std::map|s, 283 // Strict weak ordering, so that |Handle|s can be used as keys in |std::map|s,
284 inline bool operator<(const Handle a, const Handle b) { 284 inline bool operator<(const Handle a, const Handle b) {
285 return a.value() < b.value(); 285 return a.value() < b.value();
286 } 286 }
287 287
288 } // namespace mojo 288 } // namespace mojo
289 289
290 #endif // THIRD_PARTY_MOJO_SRC_MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_ 290 #endif // MOJO_PUBLIC_CPP_SYSTEM_HANDLE_H_
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