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 or 1, this macro evaluates to 11 // either the `_Then` or `_Else` args. Unlike a real conditional expression, 12 // this does not support conditions other than `0` and `1`. 13 #define BASE_IF(_Cond, _Then, _Else) \ 14 BASE_CONCAT(BASE_INTERNAL_IF_, _Cond)(_Then, _Else) 15 16 // Implementation details: do not use directly. 17 #define BASE_INTERNAL_IF_1(_Then, _Else) _Then 18 #define BASE_INTERNAL_IF_0(_Then, _Else) _Else 19 20 #endif // BASE_MACROS_IF_H_ 21