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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef nsAlgorithm_h___
#define nsAlgorithm_h___
#include <cstdint>
#include "mozilla/Assertions.h"
template <class T>
inline T NS_ROUNDUP(const T& aA, const T& aB) {
return ((aA + (aB - 1)) / aB) * aB;
// We use these instead of std::min/max because we can't include the algorithm
// header in all of XPCOM because the stl wrappers will error out when included
// in parts of XPCOM. These functions should never be used outside of XPCOM.
template <class T>
inline const T& XPCOM_MIN(const T& aA, const T& aB) {
return aB < aA ? aB : aA;
// Must return b when a == b in case a is -0
template <class T>
inline const T& XPCOM_MAX(const T& aA, const T& aB) {
return aA > aB ? aA : aB;
namespace mozilla {
template <class T>
inline const T& clamped(const T& aA, const T& aMin, const T& aMax) {
MOZ_ASSERT(aMax >= aMin,
"clamped(): aMax must be greater than or equal to aMin");
return XPCOM_MIN(XPCOM_MAX(aA, aMin), aMax);
} // namespace mozilla
template <class InputIterator, class T>
inline uint32_t NS_COUNT(InputIterator& aFirst, const InputIterator& aLast,
const T& aValue) {
uint32_t result = 0;
for (; aFirst != aLast; ++aFirst)
if (*aFirst == aValue) {
return result;
#endif // !defined(nsAlgorithm_h___)