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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 ============================ */
template<class T>
void ENSURE_UNSIGNED_TYPE() {
T TYPE_MUST_BE_UNSIGNED[(T)-1 < 0 ? -1 : 0];
}
// needle is in range [hayStart, hayStart + haySize)
template<class T, class U>
inline static bool isInRange(const T &hayStart, const U &haySize, const T &needle) {
ENSURE_UNSIGNED_TYPE<U>();
return (T)(hayStart + haySize) >= hayStart && needle >= hayStart && (U)(needle - hayStart) < haySize;
}
// [needleStart, needleStart + needleSize) is in range [hayStart, hayStart + haySize)
template<class T, class U>
inline static bool isInRange(
const T &hayStart, const U &haySize, const T &needleStart, const U &needleSize) {
ENSURE_UNSIGNED_TYPE<U>();
return isInRange(hayStart, haySize, needleStart)
&& (T)(needleStart + needleSize) >= needleStart
&& (U)(needleStart + needleSize - hayStart) <= haySize;
}
#endif // A_UTILS_H_
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