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// included by utils.hpp as a porting aid.
// Eventually it will be promoted to one or more normal headers.
#include <type_traits>
#include <iterator>
template<class T, class E, E max>
struct earray
{
// no ctor/dtor and one public member variable for easy initialization
T _data[size_t(max)];
T& operator[](E v)
{
return _data[size_t(v)];
}
const T& operator[](E v) const
{
return _data[size_t(v)];
}
T *begin()
{
return _data;
}
T *end()
{
return _data + size_t(max);
}
};
template<class T, class E>
class eptr
{
T *_data;
public:
eptr(decltype(nullptr)=nullptr)
: _data(nullptr)
{}
template<E max>
eptr(earray<T, E, max>& arr)
: _data(arr._data)
{}
T& operator [](E v)
{
return _data[size_t(v)];
}
explicit operator bool()
{
return _data;
}
bool operator not()
{
return not _data;
}
};
template<class It>
class IteratorPair
{
It b, e;
public:
IteratorPair(It b, It e)
: b(b), e(e)
{}
It begin() { return b; }
It end() { return e; }
};
template<class It>
IteratorPair<It> iterator_pair(It b, It e)
{
return {b, e};
}
#ifndef HAVE_STD_UNDERLYING_TYPE
// Note: you *must* correctly define/not define this - it conflicts!
namespace std
{
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;
};
}
#endif // HAVE_STD_UNDERLYING_TYPE
template<class E>
class EnumValueIterator
{
typedef typename std::underlying_type<E>::type U;
E value;
public:
EnumValueIterator(E v)
: value(v)
{}
E operator *()
{
return value;
}
EnumValueIterator& operator++ ()
{
value = E(U(value) + 1);
return *this;
}
EnumValueIterator& operator-- ()
{
value = E(U(value) - 1);
return *this;
}
friend bool operator == (EnumValueIterator l, EnumValueIterator r)
{
return l.value == r.value;
}
friend bool operator != (EnumValueIterator l, EnumValueIterator r)
{
return !(l == r);
}
};
template<class E>
IteratorPair<EnumValueIterator<E>> erange(E b, E e)
{
return {b, e};
}
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