chromium/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 BASE_NUMERICS_CLAMPED_MATH_H_
#define BASE_NUMERICS_CLAMPED_MATH_H_

#include <type_traits>

#include "base/numerics/clamped_math_impl.h"  // IWYU pragma: export
#include "base/numerics/safe_conversions.h"
#include "base/numerics/safe_math_shared_impl.h"  // IWYU pragma: export

namespace 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> 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> class M,
          typename L,
          typename R,
          typename... Args>
constexpr auto ClampMathOp(const L lhs, const R rhs, const Args... args) { … }

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

}  // namespace internal

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

}  // namespace base

#endif  // BASE_NUMERICS_CLAMPED_MATH_H_