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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_PUBLIC_BINDINGS_TYPE_CONVERTER_H_ | |
| 6 #define MOJO_PUBLIC_BINDINGS_TYPE_CONVERTER_H_ | |
| 7 | |
| 8 namespace mojo { | |
| 9 | |
| 10 // Specialize to perform type conversion for Mojom-defined structs and arrays. | |
| 11 // Here, T is the Mojom-defined struct or array, and U is some other non-Mojom | |
| 12 // struct or array type. | |
| 13 // | |
| 14 // EXAMPLE: | |
| 15 // | |
| 16 // Suppose you have the following Mojom-defined struct: | |
| 17 // | |
| 18 // module geometry { | |
| 19 // struct Point { | |
| 20 // int32 x; | |
| 21 // int32 y; | |
| 22 // }; | |
| 23 // } | |
| 24 // | |
| 25 // Now, imagine you wanted to write a TypeConverter specialization for | |
| 26 // gfx::Point. It might look like this: | |
| 27 // | |
| 28 // namespace mojo { | |
| 29 // template <> | |
| 30 // class TypeConverter<geometry::Point, gfx::Point> { | |
| 31 // public: | |
| 32 // static geometry::Point ConvertFrom(const gfx::Point& input, | |
| 33 // Buffer* buf) { | |
| 34 // geometry::Point::Builder builder(buf); | |
| 35 // builder.set_x(input.x()); | |
| 36 // builder.set_y(input.y()); | |
| 37 // return builder.Finish(); | |
| 38 // } | |
| 39 // static gfx::Point ConvertTo(const geometry::Point& input) { | |
| 40 // return gfx::Point(input.x(), input.y()); | |
| 41 // } | |
| 42 // }; | |
| 43 // } | |
| 44 // | |
| 45 // With the above TypeConverter defined, it is possible to write code like this: | |
| 46 // | |
| 47 // void SomeFunction(const gfx::Point& pt); | |
| 48 // | |
| 49 // void AcceptPoint(const geometry::Point& input) { | |
| 50 // // With an explicit cast using the .To<> method. | |
| 51 // gfx::Point pt = input.To<gfx::Point>(); | |
| 52 // | |
| 53 // // With an implicit copy conversion: | |
| 54 // SomeFunction(input); | |
| 55 // | |
| 56 // mojo::AllocationScope scope; | |
| 57 // // With an implicit copy conversion: | |
| 58 // geometry::Point output = pt; | |
| 59 // } | |
| 60 // | |
| 61 template <typename T, typename U> class TypeConverter { | |
| 62 // static T ConvertFrom(const U& input, Buffer* buf); | |
| 63 // static U ConvertTo(const T& input); | |
| 64 }; | |
| 65 | |
| 66 } // namespace mojo | |
| 67 | |
| 68 #endif // MOJO_PUBLIC_BINDINGS_TYPE_CONVERTER_H_ | |
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