1 /* 2 * Copyright 2025 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 namespace android::ftl { 20 21 // An alternative to `std::ignore` that makes it easy to ignore multiple values. 22 // 23 // Examples: 24 // 25 // void ftl_ignore_multiple(int arg1, const char* arg2, std::string arg3) { 26 // // When invoked, all the arguments are ignored. 27 // ftl::ignore(arg1, arg2, arg3); 28 // } 29 // 30 // void ftl_ignore_single(int arg) { 31 // // It can be used like std::ignore to ignore a single value 32 // ftl::ignore = arg; 33 // } 34 // 35 inline constexpr struct { 36 // NOLINTNEXTLINE(misc-unconventional-assign-operator, readability-named-parameter) 37 constexpr auto operator=(auto&&) const -> decltype(*this) { return *this; } 38 // NOLINTNEXTLINE(readability-named-parameter) operator__anonab6ea4dd010839 constexpr void operator()(auto&&...) const {} 40 } ignore; 41 42 } // namespace android::ftl