// Copyright (c) 2014 Marshall A. Greenblatt. Portions copyright (c) 2011 // Google 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: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * 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. // * Neither the name of Google Inc. nor the name Chromium Embedded // Framework nor the names of its contributors may be used to endorse // or promote products derived from this software without specific prior // written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT // OWNER OR 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. /// /// \file /// Use std::tuple as tuple type. This file contains helper functions for /// working with std::tuples. /// The functions DispatchToMethod and DispatchToFunction take a function /// pointer or instance and method pointer, and unpack a tuple into arguments to /// the call. /// /// Example usage: ///
///   // These two methods of creating a Tuple are identical.
///   std::tuple tuple_a(1, "wee");
///   std::tuple tuple_b = std::make_tuple(1, "wee");
///
///   void SomeFunc(int a, const char* b) { }
///   DispatchToFunction(&SomeFunc, tuple_a);  // SomeFunc(1, "wee")
///   DispatchToFunction(
///       &SomeFunc, std::make_tuple(10, "foo"));    // SomeFunc(10, "foo")
///
///   struct { void SomeMeth(int a, int b, int c) { } } foo;
///   DispatchToMethod(&foo, &Foo::SomeMeth, std::make_tuple(1, 2, 3));
///   // foo->SomeMeth(1, 2, 3);
/// 
/// #ifndef CEF_INCLUDE_BASE_CEF_TUPLE_H_ #define CEF_INCLUDE_BASE_CEF_TUPLE_H_ #pragma once #if defined(USING_CHROMIUM_INCLUDES) // When building CEF include the Chromium header directly. #include "base/tuple.h" #else // !USING_CHROMIUM_INCLUDES // The following is substantially similar to the Chromium implementation. // If the Chromium implementation diverges the below implementation should be // updated to match. #include #include #include #include "include/base/cef_build.h" namespace base { // Dispatchers ---------------------------------------------------------------- // // Helper functions that call the given method on an object, with the unpacked // tuple arguments. Notice that they all have the same number of arguments, // so you need only write: // DispatchToMethod(object, &Object::method, args); // This is very useful for templated dispatchers, since they don't need to know // what type |args| is. // Non-Static Dispatchers with no out params. template inline void DispatchToMethodImpl(const ObjT& obj, Method method, Tuple&& args, std::index_sequence) { (obj->*method)(std::get(std::forward(args))...); } template inline void DispatchToMethod(const ObjT& obj, Method method, Tuple&& args) { constexpr size_t size = std::tuple_size>::value; DispatchToMethodImpl(obj, method, std::forward(args), std::make_index_sequence()); } // Static Dispatchers with no out params. template inline void DispatchToFunctionImpl(Function function, Tuple&& args, std::index_sequence) { (*function)(std::get(std::forward(args))...); } template inline void DispatchToFunction(Function function, Tuple&& args) { constexpr size_t size = std::tuple_size>::value; DispatchToFunctionImpl(function, std::forward(args), std::make_index_sequence()); } // Dispatchers with out parameters. template inline void DispatchToMethodImpl(const ObjT& obj, Method method, InTuple&& in, OutTuple* out, std::index_sequence, std::index_sequence) { (obj->*method)(std::get(std::forward(in))..., &std::get(*out)...); } template inline void DispatchToMethod(const ObjT& obj, Method method, InTuple&& in, OutTuple* out) { constexpr size_t in_size = std::tuple_size>::value; constexpr size_t out_size = std::tuple_size::value; DispatchToMethodImpl(obj, method, std::forward(in), out, std::make_index_sequence(), std::make_index_sequence()); } } // namespace base #endif // !USING_CHROMIUM_INCLUDES #endif // CEF_INCLUDE_BASE_CEF_TUPLE_H_