1*6777b538SAndroid Build Coastguard Worker // Copyright 2023 The Chromium Authors 2*6777b538SAndroid Build Coastguard Worker // Use of this source code is governed by a BSD-style license that can be 3*6777b538SAndroid Build Coastguard Worker // found in the LICENSE file. 4*6777b538SAndroid Build Coastguard Worker 5*6777b538SAndroid Build Coastguard Worker #ifndef BASE_MACROS_IS_EMPTY_H_ 6*6777b538SAndroid Build Coastguard Worker #define BASE_MACROS_IS_EMPTY_H_ 7*6777b538SAndroid Build Coastguard Worker 8*6777b538SAndroid Build Coastguard Worker // A macro that substitutes with 1 if called without arguments, otherwise 0. 9*6777b538SAndroid Build Coastguard Worker #define BASE_IS_EMPTY(...) BASE_INTERNAL_IS_EMPTY_EXPANDED(__VA_ARGS__) 10*6777b538SAndroid Build Coastguard Worker #define BASE_INTERNAL_IS_EMPTY_EXPANDED(...) \ 11*6777b538SAndroid Build Coastguard Worker BASE_INTERNAL_IS_EMPTY_INNER(_, ##__VA_ARGS__) 12*6777b538SAndroid Build Coastguard Worker #define BASE_INTERNAL_IS_EMPTY_INNER(...) \ 13*6777b538SAndroid Build Coastguard Worker BASE_INTERNAL_IS_EMPTY_INNER_EXPANDED(__VA_ARGS__, 0, 1) 14*6777b538SAndroid Build Coastguard Worker #define BASE_INTERNAL_IS_EMPTY_INNER_EXPANDED(e0, e1, is_empty, ...) is_empty 15*6777b538SAndroid Build Coastguard Worker 16*6777b538SAndroid Build Coastguard Worker #endif // BASE_MACROS_IS_EMPTY_H_ 17