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#pragma once
#include "std/type_traits.hpp"
namespace my
{
namespace impl
{
template <typename From, typename To>
using IsConvertibleGuard = typename enable_if<is_convertible<From, To>::value>::type *;
} // namespace impl
/// Creates a typesafe alias to a given numeric Type.
template <typename Type, typename Tag>
class NewType
{
static_assert(is_integral<Type>::value || is_floating_point<Type>::value,
"NewType can be used only with integral and floating point type.");
public:
template <typename V, impl::IsConvertibleGuard<V, Type> = nullptr>
explicit NewType(V const & v) : m_value(v)
{
}
template <typename V, impl::IsConvertibleGuard<V, Type> = nullptr>
NewType & Set(V const & v)
{
m_value = static_cast<Type>(v);
return *this;
}
Type const & Get() const { return m_value; }
Type & Get() { return m_value; }
NewType & operator=(NewType const & v)
{
m_value = v.m_value;
return *this;
}
NewType & operator++()
{
++m_value;
return *this;
}
NewType const operator++(int)
{
auto const copy = *this;
++m_value;
return copy;
}
NewType & operator--()
{
--m_value;
return *this;
}
NewType const operator--(int)
{
auto const copy = *this;
--m_value;
return copy;
}
NewType & operator+=(NewType const & v)
{
m_value += v.m_value;
return *this;
}
NewType & operator-=(NewType const & v)
{
m_value -= v.m_value;
return *this;
}
NewType & operator*=(NewType const & v)
{
m_value *= v.m_value;
return *this;
}
NewType & operator/=(NewType const & v)
{
m_value /= v.m_value;
return *this;
}
NewType & operator%=(NewType const & v)
{
m_value %= v.m_value;
return *this;
}
NewType & operator^=(NewType const & v)
{
m_value ^= v.m_value;
return *this;
}
NewType & operator|=(NewType const & v)
{
m_value |= v.m_value;
return *this;
}
NewType & operator&=(NewType const & v)
{
m_value &= v.m_value;
return *this;
}
// TODO(mgsergio): Is it meaningful for a newtype to have << operator ?
// NewType & operator<<=(NewType<V, VTag> const & v)
// NewType & operator>>=(NewType<V, VTag> const & v)
bool operator==(NewType const & o) const { return m_value == o.m_value; }
bool operator!=(NewType const & o) const { return !(m_value == o.m_value); }
bool operator<(NewType const & o) const { return m_value < o.m_value; }
bool operator>(NewType const & o) const { return m_value > o.m_value; }
bool operator<=(NewType const & o) const { return !(m_value > o.m_value); }
bool operator>=(NewType const & o) const { return !(m_value < o.m_value); }
NewType operator+(NewType const & o) const { return NewType(m_value + o.m_value); }
NewType operator-(NewType const & o) const { return NewType(m_value - o.m_value); }
NewType operator*(NewType const & o) const { return NewType(m_value * o.m_value); }
NewType operator/(NewType const & o) const { return NewType(m_value / o.m_value); }
NewType operator%(NewType const & o) const { return NewType(m_value % o.m_value); }
NewType operator^(NewType const & o) const { return NewType(m_value ^ o.m_value); }
NewType operator|(NewType const & o) const { return NewType(m_value | o.m_value); }
NewType operator&(NewType const & o) const { return NewType(m_value & o.m_value); }
private:
Type m_value;
};
} // namespace my
#define NEWTYPE(REPR, NAME) \
struct NAME ## _tag; \
using NAME = my::NewType<REPR, NAME ## _tag>
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