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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* 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 http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you 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 .
*/
#ifndef INCLUDED_O3TL_STRONG_INT_HXX
#define INCLUDED_O3TL_STRONG_INT_HXX
#include <sal/config.h>
#include <limits>
#include <cassert>
#include <type_traits>
namespace o3tl
{
#if !defined __COVERITY__
namespace detail {
template<typename T1, typename T2> constexpr
typename std::enable_if<
std::is_signed<T1>::value && std::is_signed<T2>::value, bool>::type
isInRange(T2 value) {
return value >= std::numeric_limits<T1>::min()
&& value <= std::numeric_limits<T1>::max();
}
template<typename T1, typename T2> constexpr
typename std::enable_if<
std::is_signed<T1>::value && std::is_unsigned<T2>::value, bool>::type
isInRange(T2 value) {
return value
<= static_cast<typename std::make_unsigned<T1>::type>(
std::numeric_limits<T1>::max());
}
template<typename T1, typename T2> constexpr
typename std::enable_if<
std::is_unsigned<T1>::value && std::is_signed<T2>::value, bool>::type
isInRange(T2 value) {
return value >= 0
&& (static_cast<typename std::make_unsigned<T2>::type>(value)
<= std::numeric_limits<T1>::max());
}
template<typename T1, typename T2> constexpr
typename std::enable_if<
std::is_unsigned<T1>::value && std::is_unsigned<T2>::value, bool>::type
isInRange(T2 value) {
return value <= std::numeric_limits<T1>::max();
}
}
#endif
///
/// Wrap up an integer type so that we prevent accidental conversion to other integer types.
///
/// e.g.
/// typedef o3tl::strong_int<unsigned, struct MyIntTag> MyInt;
///
/// \param UNDERLYING_TYPE the underlying scalar type
/// \param PHANTOM_TYPE a type tag, used to distinguish this instantiation of the template
/// from other instantiations with the same UNDERLYING_TYPE.
///
template <typename UNDERLYING_TYPE, typename PHANTOM_TYPE>
struct strong_int
{
public:
template<typename T> explicit constexpr strong_int(
T value,
typename std::enable_if<std::is_integral<T>::value, int>::type = 0):
m_value(value)
{
#if !defined __COVERITY__
// catch attempts to pass in out-of-range values early
assert(detail::isInRange<UNDERLYING_TYPE>(value)
&& "out of range");
#endif
}
strong_int() : m_value(0) {}
explicit constexpr operator UNDERLYING_TYPE() const { return m_value; }
explicit operator bool() const { return m_value != 0; }
UNDERLYING_TYPE get() const { return m_value; }
bool operator<(strong_int const & other) const { return m_value < other.m_value; }
bool operator<=(strong_int const & other) const { return m_value <= other.m_value; }
bool operator>(strong_int const & other) const { return m_value > other.m_value; }
bool operator>=(strong_int const & other) const { return m_value >= other.m_value; }
bool operator==(strong_int const & other) const { return m_value == other.m_value; }
bool operator!=(strong_int const & other) const { return m_value != other.m_value; }
strong_int& operator++() { ++m_value; return *this; }
strong_int operator++(int) { UNDERLYING_TYPE nOldValue = m_value; ++m_value; return strong_int(nOldValue); }
strong_int& operator--() { --m_value; return *this; }
strong_int operator--(int) { UNDERLYING_TYPE nOldValue = m_value; --m_value; return strong_int(nOldValue); }
strong_int& operator+=(strong_int const & other) { m_value += other.m_value; return *this; }
strong_int& operator-=(strong_int const & other) { m_value -= other.m_value; return *this; }
bool anyOf(strong_int v) const {
return *this == v;
}
template<typename... Args>
bool anyOf(strong_int first, Args... args) const {
return *this == first || anyOf(args...);
}
private:
UNDERLYING_TYPE m_value;
};
template <typename UT, typename PT>
strong_int<UT,PT> operator+(strong_int<UT,PT> const & lhs, strong_int<UT,PT> const & rhs)
{
return strong_int<UT,PT>(lhs.get() + rhs.get());
}
template <typename UT, typename PT>
strong_int<UT,PT> operator-(strong_int<UT,PT> const & lhs, strong_int<UT,PT> const & rhs)
{
return strong_int<UT,PT>(lhs.get() - rhs.get());
}
}; // namespace o3tl
#endif /* INCLUDED_O3TL_STRONG_INT_HXX */
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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