typedwhich.hxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
/*
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 */
#ifndef INCLUDED_SVL_TYPEDWHICH_HXX
#define INCLUDED_SVL_TYPEDWHICH_HXX
 
#include <sal/config.h>
#include <sal/types.h>
#include <type_traits>
 
template <class T> class TypedWhichId final
{
public:
    explicit constexpr TypedWhichId(sal_uInt16 nWhich)
        : mnWhich(nWhich)
    {
    }
 
    template <class derived_type>
    constexpr TypedWhichId(TypedWhichId<derived_type> other,
                           std::enable_if_t<std::is_base_of_v<T, derived_type>, int> = 0)
        : mnWhich(sal_uInt16(other))
    {
    }
 
    constexpr operator sal_uInt16() const { return mnWhich; }
 
private:
    sal_uInt16 mnWhich;
};
 
template <class T> constexpr bool operator==(TypedWhichId<T> const& lhs, TypedWhichId<T> rhs)
{
    return sal_uInt16(lhs) == sal_uInt16(rhs);
}
template <class T> constexpr bool operator!=(TypedWhichId<T> const& lhs, TypedWhichId<T> rhs)
{
    return sal_uInt16(lhs) != sal_uInt16(rhs);
}
template <class T> constexpr bool operator==(sal_uInt16 lhs, TypedWhichId<T> const& rhs)
{
    return lhs == sal_uInt16(rhs);
}
template <class T> constexpr bool operator!=(sal_uInt16 lhs, TypedWhichId<T> const& rhs)
{
    return lhs != sal_uInt16(rhs);
}
template <class T> constexpr bool operator==(TypedWhichId<T> const& lhs, sal_uInt16 rhs)
{
    return sal_uInt16(lhs) == rhs;
}
template <class T> constexpr bool operator!=(TypedWhichId<T> const& lhs, sal_uInt16 rhs)
{
    return sal_uInt16(lhs) != rhs;
}
 
#endif // INCLUDED_SVL_TYPEDWHICH_HXX
 
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