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/*
* Copyright 2014 The Android Open Source Project
*
* 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
*
* http://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 A_UTILS_H_
#define A_UTILS_H_
/* ============================ math templates ============================ */
/* T must be integer type, den must not be 0 */
template<class T>
inline static const T divRound(const T &nom, const T &den) {
if ((nom >= 0) ^ (den >= 0)) {
return (nom - den / 2) / den;
} else {
return (nom + den / 2) / den;
}
}
/* == ceil(nom / den). T must be integer type, den must not be 0 */
template<class T>
inline static const T divUp(const T &nom, const T &den) {
if (den < 0) {
return (nom < 0 ? nom + den + 1 : nom) / den;
} else {
return (nom < 0 ? nom : nom + den - 1) / den;
}
}
/* == ceil(nom / den) * den. T must be integer type, alignment must be positive power of 2 */
template<class T, class U>
inline static const T align(const T &nom, const U &den) {
return (nom + (T)(den - 1)) & (T)~(den - 1);
}
template<class T>
inline static T abs(const T &a) {
return a < 0 ? -a : a;
}
template<class T>
inline static const T &min(const T &a, const T &b) {
return a < b ? a : b;
}
template<class T>
inline static const T &max(const T &a, const T &b) {
return a > b ? a : b;
}
/* T must be integer type, period must be positive */
template<class T>
inline static T periodicError(const T &val, const T &period) {
T err = abs(val) % period;
return (err < (period / 2)) ? err : (period - err);
}
#endif // A_UTILS_H_
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