| /* |
| * Copyright (C) 2010 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include <wtf/Optional.h> |
| |
| namespace WebCore { |
| class IntConstraint; |
| class DoubleConstraint; |
| class ResourceResponse; |
| struct ViewportArguments; |
| } |
| |
| namespace IPC { |
| |
| class Decoder; |
| class Encoder; |
| |
| template<typename> struct ArgumentCoder; |
| |
| template<typename> class UsesModernDecoder; |
| |
| template<typename U> |
| class UsesModernDecoder { |
| private: |
| template<typename T, T> struct Helper; |
| template<typename T> static uint8_t check(Helper<Optional<U> (*)(Decoder&), &T::decode>*); |
| template<typename T> static uint16_t check(...); |
| template<typename T> static uint8_t checkArgumentCoder(Helper<Optional<U> (*)(Decoder&), &ArgumentCoder<T>::decode>*); |
| template<typename T> static uint16_t checkArgumentCoder(...); |
| public: |
| static constexpr bool argumentCoderValue = sizeof(check<U>(nullptr)) == sizeof(uint8_t); |
| static constexpr bool value = argumentCoderValue || sizeof(checkArgumentCoder<U>(nullptr)) == sizeof(uint8_t); |
| }; |
| |
| template<typename... Types> |
| class UsesModernDecoder<std::tuple<Types...>> { |
| public: |
| static constexpr bool value = true; |
| static constexpr bool argumentCoderValue = true; |
| }; |
| |
| template<typename U> |
| class UsesLegacyDecoder { |
| private: |
| template<typename T, T> struct Helper; |
| template<typename T> static uint8_t check(Helper<bool (*)(Decoder&, U&), &T::decode>*); |
| template<typename T> static uint16_t check(...); |
| template<typename T> static uint8_t checkArgumentCoder(Helper<bool (*)(Decoder&, U&), &ArgumentCoder<T>::decode>*); |
| template<typename T> static uint16_t checkArgumentCoder(...); |
| public: |
| static constexpr bool argumentCoderValue = sizeof(check<U>(nullptr)) == sizeof(uint8_t); |
| static constexpr bool value = argumentCoderValue || sizeof(checkArgumentCoder<U>(nullptr)) == sizeof(uint8_t); |
| }; |
| |
| template<typename BoolType> |
| class DefaultDecoderValues { |
| public: |
| static constexpr bool argumentCoderValue = BoolType::value; |
| static constexpr bool value = BoolType::value; |
| }; |
| |
| // ResourceResponseBase has the legacy decode template, not ResourceResponse. |
| template<> class UsesModernDecoder<WebCore::ResourceResponse> : public DefaultDecoderValues<std::false_type> { }; |
| template<> class UsesLegacyDecoder<WebCore::ResourceResponse> : public DefaultDecoderValues<std::true_type> { }; |
| |
| // IntConstraint and DoubleConstraint have their legacy decoder templates in NumericConstraint. |
| template<> class UsesModernDecoder<WebCore::IntConstraint> : public DefaultDecoderValues<std::false_type> { }; |
| template<> class UsesLegacyDecoder<WebCore::IntConstraint> : public DefaultDecoderValues<std::true_type> { }; |
| template<> class UsesModernDecoder<WebCore::DoubleConstraint> : public DefaultDecoderValues<std::false_type> { }; |
| template<> class UsesLegacyDecoder<WebCore::DoubleConstraint> : public DefaultDecoderValues<std::true_type> { }; |
| |
| template<typename T> struct ArgumentCoder { |
| static void encode(Encoder& encoder, const T& t) |
| { |
| t.encode(encoder); |
| } |
| |
| template<typename U = T, std::enable_if_t<UsesLegacyDecoder<U>::argumentCoderValue>* = nullptr> |
| static bool decode(Decoder& decoder, U& u) |
| { |
| return U::decode(decoder, u); |
| } |
| |
| template<typename U = T, std::enable_if_t<UsesModernDecoder<U>::argumentCoderValue>* = nullptr> |
| static Optional<U> decode(Decoder& decoder) |
| { |
| return U::decode(decoder); |
| } |
| }; |
| |
| } |