where.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_BASIC_FUNCTIONS_WHERE_H
#define pRC_CORE_BASIC_FUNCTIONS_WHERE_H
 
#include <prc/core/basic/concepts.hpp>
 
namespace pRC
{
    template<IsBool TE, class XA, class XB>
    static inline constexpr decltype(auto) where(TE const e, XA &&a, XB &&b)
    {
        if constexpr(IsSame<RemoveConstReference<XA>, RemoveConstReference<XB>>)
        {
            return as(e ? forward<XA>(a) : forward<XB>(b));
        }
        else
        {
            using T =
                Common<RemoveConstReference<XA>, RemoveConstReference<XB>>;
            return where(e, T(forward<XA>(a)), T(forward<XB>(b)));
        }
    }
}
#endif // pRC_CORE_BASIC_FUNCTIONS_WHERE_H