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/*
* Copyright (C) 2008-2019 TrinityCore <https://www.trinitycore.org/>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TRINITY_SMARTENUM_H
#define TRINITY_SMARTENUM_H
#include "IteratorPair.h"
#include <iterator>
struct EnumText
{
EnumText(char const* c, char const* t, char const* d) : Constant(c), Title(t), Description(d) {}
// Enum constant of the value
char const* const Constant;
// Human-readable title of the value
char const* const Title;
// Human-readable description of the value
char const* const Description;
};
namespace Trinity
{
namespace Impl
{
template <typename Enum>
struct EnumUtils
{
static size_t Count();
static EnumText ToString(Enum value);
static Enum FromIndex(size_t index);
};
}
}
class EnumUtils
{
public:
template <typename Enum>
static size_t Count() { return Trinity::Impl::EnumUtils<Enum>::Count(); }
template <typename Enum>
static EnumText ToString(Enum value) { return Trinity::Impl::EnumUtils<Enum>::ToString(value); }
template <typename Enum>
static Enum FromIndex(size_t index) { return Trinity::Impl::EnumUtils<Enum>::FromIndex(index); }
template <typename Enum>
class Iterator
{
public:
using iterator_category = std::random_access_iterator_tag;
using value_type = Enum;
using pointer = Enum*;
using reference = Enum&;
using difference_type = std::ptrdiff_t;
Iterator() : _index(EnumUtils::Count<Enum>()) {}
explicit Iterator(size_t index) : _index(index) { }
bool operator==(const Iterator& other) const { return other._index == _index; }
bool operator!=(const Iterator& other) const { return !operator==(other); }
difference_type operator-(Iterator const& other) const { return _index - other._index; }
bool operator<(const Iterator& other) const { return _index < other._index; }
bool operator<=(const Iterator& other) const { return _index <= other._index; }
bool operator>(const Iterator& other) const { return _index > other._index; }
bool operator>=(const Iterator& other) const { return _index >= other._index; }
value_type operator[](difference_type d) const { return FromIndex<Enum>(_index + d); }
value_type operator*() const { return operator[](0); }
Iterator& operator+=(difference_type d) { _index += d; return *this; }
Iterator& operator++() { return operator+=(1); }
Iterator operator++(int) { Iterator i = *this; operator++(); return i; }
Iterator operator+(difference_type d) const { Iterator i = *this; i += d; return i; }
Iterator& operator-=(difference_type d) { _index -= d; return *this; }
Iterator& operator--() { return operator-=(1); }
Iterator operator--(int) { Iterator i = *this; operator--(); return i; }
Iterator operator-(difference_type d) const { Iterator i = *this; i -= d; return i; }
private:
difference_type _index;
};
template <typename Enum>
static Iterator<Enum> Begin() { return Iterator<Enum>(0); }
template <typename Enum>
static Iterator<Enum> End() { return Iterator<Enum>(); }
template <typename Enum>
static Trinity::IteratorPair<Iterator<Enum>> Iterate() { return { Begin<Enum>(), End<Enum>() }; }
template <typename Enum>
static char const* ToConstant(Enum value) { return ToString(value).Constant; }
template <typename Enum>
static char const* ToTitle(Enum value) { return ToString(value).Title; }
template <typename Enum>
static char const* ToDescription(Enum value) { return ToString(value).Description; }
};
#endif
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