ui: Remove some unnecessary functions from the API.
[chromium-blink-merge.git] / base / mac / bind_objc_block.h
blob9deb2d22e75c5add2da220e47898060eca0f53b7
1 // Copyright (c) 2012 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.
5 #ifndef BASE_MAC_BIND_OBJC_BLOCK_H_
6 #define BASE_MAC_BIND_OBJC_BLOCK_H_
8 #include <Block.h>
10 #include "base/bind.h"
11 #include "base/callback_forward.h"
12 #include "base/mac/scoped_block.h"
14 // BindBlock builds a callback from an Objective-C block. Example usages:
16 // Closure closure = BindBlock(^{DoSomething();});
18 // Callback<int(void)> callback = BindBlock(^{return 42;});
20 // Callback<void(const std::string&, const std::string&)> callback =
21 // BindBlock(^(const std::string& arg0, const std::string& arg1) {
22 // ...
23 // });
25 namespace base {
27 namespace internal {
29 // Helper functions to run the block contained in the parameter.
30 template<typename R>
31 R RunBlock(base::mac::ScopedBlock<R(^)()> block) {
32 R(^extracted_block)() = block.get();
33 return extracted_block();
36 template<typename R, typename A1>
37 R RunBlock(base::mac::ScopedBlock<R(^)(A1)> block, A1 a) {
38 R(^extracted_block)(A1) = block.get();
39 return extracted_block(a);
42 template<typename R, typename A1, typename A2>
43 R RunBlock(base::mac::ScopedBlock<R(^)(A1, A2)> block, A1 a, A2 b) {
44 R(^extracted_block)(A1, A2) = block.get();
45 return extracted_block(a, b);
48 } // namespace internal
50 // Construct a callback with no argument from an objective-C block.
51 template<typename R>
52 base::Callback<R(void)> BindBlock(R(^block)()) {
53 return base::Bind(&base::internal::RunBlock<R>,
54 base::mac::ScopedBlock<R(^)()>(Block_copy(block)));
57 // Construct a callback with one argument from an objective-C block.
58 template<typename R, typename A1>
59 base::Callback<R(A1)> BindBlock(R(^block)(A1)) {
60 return base::Bind(&base::internal::RunBlock<R, A1>,
61 base::mac::ScopedBlock<R(^)(A1)>(Block_copy(block)));
64 // Construct a callback with two arguments from an objective-C block.
65 template<typename R, typename A1, typename A2>
66 base::Callback<R(A1, A2)> BindBlock(R(^block)(A1, A2)) {
67 return base::Bind(&base::internal::RunBlock<R, A1, A2>,
68 base::mac::ScopedBlock<R(^)(A1, A2)>(Block_copy(block)));
71 } // namespace base
73 #endif // BASE_MAC_BIND_OBJC_BLOCK_H_