1 // Copyright 2021 The Pigweed Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not 4 // use this file except in compliance with the License. You may obtain a copy of 5 // the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the 12 // License for the specific language governing permissions and limitations under 13 // the License. 14 15 namespace { 16 17 int volatile* unoptimizable; 18 DoTheThing(int value,void (* callback)(int))19void DoTheThing(int value, void (*callback)(int)) { 20 callback(value ^ *unoptimizable); 21 } 22 23 int thing_result; 24 Callback(int result)25void Callback(int result) { thing_result = result; } 26 27 } // namespace 28 main()29int main() { 30 DoTheThing(3, Callback); 31 return thing_result; 32 } 33