64c9bda0b9
(where it is not actually needed), and instead include it where needed Change-Id: I107f8d4002d3001393b89834dd30a30b0c53a792 Reviewed-on: https://gerrit.libreoffice.org/48152 Reviewed-by: Stephan Bergmann <sbergman@redhat.com> Tested-by: Stephan Bergmann <sbergman@redhat.com>
139 lines
4.5 KiB
C++
139 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_O3TL_STRONG_INT_HXX
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#define INCLUDED_O3TL_STRONG_INT_HXX
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#include <sal/config.h>
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#include <limits>
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#include <cassert>
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#include <type_traits>
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#include <config_global.h>
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namespace o3tl
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{
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#if HAVE_CXX14_CONSTEXPR
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namespace detail {
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template<typename T1, typename T2> constexpr
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typename std::enable_if<
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std::is_signed<T1>::value && std::is_signed<T2>::value, bool>::type
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isInRange(T2 value) {
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return value >= std::numeric_limits<T1>::min()
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&& value <= std::numeric_limits<T1>::max();
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}
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template<typename T1, typename T2> constexpr
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typename std::enable_if<
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std::is_signed<T1>::value && std::is_unsigned<T2>::value, bool>::type
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isInRange(T2 value) {
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return value
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<= static_cast<typename std::make_unsigned<T1>::type>(
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std::numeric_limits<T1>::max());
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}
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template<typename T1, typename T2> constexpr
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typename std::enable_if<
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std::is_unsigned<T1>::value && std::is_signed<T2>::value, bool>::type
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isInRange(T2 value) {
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return value >= 0
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&& (static_cast<typename std::make_unsigned<T2>::type>(value)
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<= std::numeric_limits<T1>::max());
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}
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template<typename T1, typename T2> constexpr
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typename std::enable_if<
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std::is_unsigned<T1>::value && std::is_unsigned<T2>::value, bool>::type
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isInRange(T2 value) {
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return value <= std::numeric_limits<T1>::max();
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}
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}
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#endif
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///
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/// Wrap up an integer type so that we prevent accidental conversion to other integer types.
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///
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/// e.g.
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/// struct MyIntTag {};
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/// typedef o3tl::strong_int<unsigned, MyIntTag> MyInt;
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///
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/// \param UNDERLYING_TYPE the underlying scalar type
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/// \param PHANTOM_TYPE a type tag, used to distinguish this instantiation of the template
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/// from other instantiations with the same UNDERLYING_TYPE.
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///
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template <typename UNDERLYING_TYPE, typename PHANTOM_TYPE>
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struct strong_int
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{
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public:
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template<typename T> explicit constexpr strong_int(
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T value,
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typename std::enable_if<std::is_integral<T>::value, int>::type = 0):
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m_value(value)
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{
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#if !defined __COVERITY__ && HAVE_CXX14_CONSTEXPR
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// catch attempts to pass in out-of-range values early
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assert(detail::isInRange<UNDERLYING_TYPE>(value)
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&& "out of range");
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#endif
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}
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strong_int() : m_value(0) {}
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explicit constexpr operator UNDERLYING_TYPE() const { return m_value; }
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explicit operator bool() const { return m_value != 0; }
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UNDERLYING_TYPE get() const { return m_value; }
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bool operator<(strong_int const & other) const { return m_value < other.m_value; }
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bool operator<=(strong_int const & other) const { return m_value <= other.m_value; }
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bool operator>(strong_int const & other) const { return m_value > other.m_value; }
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bool operator>=(strong_int const & other) const { return m_value >= other.m_value; }
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bool operator==(strong_int const & other) const { return m_value == other.m_value; }
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bool operator!=(strong_int const & other) const { return m_value != other.m_value; }
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strong_int& operator++() { ++m_value; return *this; }
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strong_int operator++(int) { UNDERLYING_TYPE nOldValue = m_value; ++m_value; return strong_int(nOldValue); }
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bool anyOf(strong_int v) const {
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return *this == v;
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}
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template<typename... Args>
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bool anyOf(strong_int first, Args... args) const {
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return *this == first || anyOf(args...);
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}
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private:
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UNDERLYING_TYPE m_value;
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};
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template <typename UT, typename PT>
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strong_int<UT,PT> operator+(strong_int<UT,PT> const & lhs, strong_int<UT,PT> const & rhs)
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{
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return strong_int<UT,PT>(lhs.get() + rhs.get());
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}
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}; // namespace o3tl
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#endif /* INCLUDED_O3TL_STRONG_INT_HXX */
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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