chromium/base/allocator/partition_allocator/src/partition_alloc/partition_alloc_base/numerics/clamped_math.h

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef PARTITION_ALLOC_PARTITION_ALLOC_BASE_NUMERICS_CLAMPED_MATH_H_
#define PARTITION_ALLOC_PARTITION_ALLOC_BASE_NUMERICS_CLAMPED_MATH_H_

#include <cstddef>
#include <limits>
#include <type_traits>

#include "partition_alloc/partition_alloc_base/numerics/clamped_math_impl.h"

namespace partition_alloc::internal::base {
namespace internal {

template <typename T>
class ClampedNumeric { … };

// Convenience wrapper to return a new ClampedNumeric from the provided
// arithmetic or ClampedNumericType.
template <typename T>
constexpr ClampedNumeric<typename UnderlyingType<T>::type> MakeClampedNum(
    const T value) { … }

// These implement the variadic wrapper for the math operations.
template <template <typename, typename, typename> class M,
          typename L,
          typename R>
constexpr ClampedNumeric<typename MathWrapper<M, L, R>::type> ClampMathOp(
    const L lhs,
    const R rhs) { … }

// General purpose wrapper template for arithmetic operations.
template <template <typename, typename, typename> class M,
          typename L,
          typename R,
          typename... Args>
constexpr auto ClampMathOp(const L lhs, const R rhs, const Args... args) { … }

PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Add, +, +=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Sub, -, -=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Mul, *, *=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Div, /, /=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Mod, %, %=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Lsh, <<, <<=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Rsh, >>, >>=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, And, &, &=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Or, |, |=)
PA_BASE_NUMERIC_ARITHMETIC_OPERATORS(Clamped, Clamp, Xor, ^, ^=)
PA_BASE_NUMERIC_ARITHMETIC_VARIADIC(…)
PA_BASE_NUMERIC_ARITHMETIC_VARIADIC(…)
PA_BASE_NUMERIC_COMPARISON_OPERATORS(Clamped, IsLess, <)
PA_BASE_NUMERIC_COMPARISON_OPERATORS(Clamped, IsLessOrEqual, <=)
PA_BASE_NUMERIC_COMPARISON_OPERATORS(Clamped, IsGreater, >)
PA_BASE_NUMERIC_COMPARISON_OPERATORS(Clamped, IsGreaterOrEqual, >=)
PA_BASE_NUMERIC_COMPARISON_OPERATORS(Clamped, IsEqual, ==)
PA_BASE_NUMERIC_COMPARISON_OPERATORS(Clamped, IsNotEqual, !=)

}  // namespace internal

ClampAdd;
ClampAnd;
ClampDiv;
ClampedNumeric;
ClampLsh;
ClampMax;
ClampMin;
ClampMod;
ClampMul;
ClampOr;
ClampRsh;
ClampSub;
ClampXor;
MakeClampedNum;

}  // namespace partition_alloc::internal::base

#endif  // PARTITION_ALLOC_PARTITION_ALLOC_BASE_NUMERICS_CLAMPED_MATH_H_