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#ifndef TMWA_GENERIC_ENUM_HPP
#define TMWA_GENERIC_ENUM_HPP
# include "../sanity.hpp"
# include <cassert>
# include <type_traits>
# include "../compat/iter.hpp"
template<class T, class E, E max>
struct earray
{
constexpr static
size_t size()
{
return static_cast<size_t>(max);
}
// no ctor/dtor and one public member variable for easy initialization
T _data[size()];
T& operator[](E v)
{
auto i = static_cast<size_t>(v);
assert (i < size());
return _data[i];
}
const T& operator[](E v) const
{
auto i = static_cast<size_t>(v);
assert (i < size());
return _data[i];
}
T *begin()
{
return _data;
}
T *end()
{
return _data + size();
}
const T *begin() const
{
return _data;
}
const T *end() const
{
return _data + size();
}
friend bool operator == (const earray& l, const earray& r)
{
return std::equal(l.begin(), l.end(), r.begin());
}
friend bool operator != (const earray& l, const earray& r)
{
return !(l == r);
}
};
template<class T, class E, E max>
class eptr
{
constexpr static
size_t size()
{
return static_cast<size_t>(max);
}
T *_data;
public:
eptr(std::nullptr_t=nullptr)
: _data(nullptr)
{}
eptr(earray<T, E, max>& arr)
: _data(arr._data)
{}
T& operator [](E v) const
{
auto i = static_cast<size_t>(v);
assert (i < size());
return _data[i];
}
explicit operator bool()
{
return _data;
}
bool operator not()
{
return not _data;
}
};
// std::underlying_type isn't supported until gcc 4.7
// this is a poor man's emulation
template<class E>
struct underlying_type
{
static_assert(std::is_enum<E>::value, "Only enums have underlying type!");
typedef typename std::conditional<
std::is_signed<E>::value,
typename std::make_signed<E>::type,
typename std::make_unsigned<E>::type
>::type type;
};
template<class E, bool=std::is_enum<E>::value>
struct remove_enum
{
typedef E type;
};
template<class E>
struct remove_enum<E, true>
{
typedef typename underlying_type<E>::type type;
};
// This really should just go in a namespace
// that's how I use it anyway ...
# define ENUM_BITWISE_OPERATORS(E) \
inline \
E operator & (E l, E r) \
{ \
typedef underlying_type<E>::type U; \
return E(U(l) & U(r)); \
} \
inline \
E operator | (E l, E r) \
{ \
typedef underlying_type<E>::type U; \
return E(U(l) | U(r)); \
} \
inline \
E operator ^ (E l, E r) \
{ \
typedef underlying_type<E>::type U; \
return E(U(l) ^ U(r)); \
} \
inline \
E& operator &= (E& l, E r) \
{ \
return l = l & r; \
} \
inline \
E& operator |= (E& l, E r) \
{ \
return l = l | r; \
} \
inline \
E& operator ^= (E& l, E r) \
{ \
return l = l ^ r; \
} \
inline \
E operator ~ (E r) \
{ \
return E(-1) ^ r; \
}
template<class E>
class EnumMath
{
typedef typename underlying_type<E>::type U;
public:
static
E inced(E v)
{
return E(U(v) + 1);
}
};
template<class E>
IteratorPair<ValueIterator<E, EnumMath<E>>> erange(E b, E e)
{
return {b, e};
}
#endif // TMWA_GENERIC_ENUM_HPP
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