1 // Copyright 2023 The Chromium Authors 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 BASE_MACROS_IF_H_ 6 #define BASE_MACROS_IF_H_ 7 8 #include "base/macros/concat.h" 9 10 // Given a `_Cond` that evaluates to exactly 0/false or 1/true, this macro 11 // evaluates to either the `_Then` or `_Else` args. Unlike a real conditional 12 // expression, this does not support conditions other than `0`, `1`, `true` or 13 // `false`. 14 #define BASE_IF(_Cond, _Then, _Else) \ 15 BASE_CONCAT(BASE_INTERNAL_IF_, _Cond)(_Then, _Else) 16 17 // Implementation details: do not use directly. 18 #define BASE_INTERNAL_IF_1(_Then, _Else) _Then 19 #define BASE_INTERNAL_IF_0(_Then, _Else) _Else 20 #define BASE_INTERNAL_IF_true(_Then, _Else) _Then 21 #define BASE_INTERNAL_IF_false(_Then, _Else) _Else 22 23 #endif // BASE_MACROS_IF_H_ 24