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/*
* Copyright 2019 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_FXLAB_DRIVECONTROL_H
#define ANDROID_FXLAB_DRIVECONTROL_H
#include <functional>
template <class iter_type>
class DriveControl {
public:
DriveControl(std::function<void(iter_type, iter_type)> function, double scale):
mFunction(function), kScale(scale) {}
void operator() (iter_type beg, iter_type end) {
std::for_each(beg, end, [this](auto &x){x *= kScale;});
mFunction(beg, end);
std::for_each(beg, end, [this](auto &x){x *= recip;});
}
private:
std::function<void(iter_type, iter_type)> mFunction;
const double kScale;
const double recip = 1 / kScale;
};
#endif //ANDROID_FXLAB_DRIVECONTROL_H
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