max.hpp

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// SPDX-License-Identifier: BSD-2-Clause
 
#ifndef pRC_CORE_BASIC_FUNCTIONS_MAX_H
#define pRC_CORE_BASIC_FUNCTIONS_MAX_H
 
#include <prc/core/basic/concepts.hpp>
#include <prc/core/functors/greater.hpp>
#include <prc/core/functors/where.hpp>
 
namespace pRC
{
    template<class X>
    static inline constexpr decltype(auto) max(X &&a)
    {
        return as(forward<X>(a));
    }
 
    template<class XA, class XB>
        requires IsInvocable<Greater, XA, XB>
    static inline constexpr decltype(auto) max(XA &&a, XB &&b)
    {
        return where(a > b, forward<XA>(a), forward<XB>(b));
    }
 
    template<class XA, class XB, class... Xs>
        requires IsInvocable<Greater, XA, XB> &&
        (IsInvocable<Greater,
             ResultOf<Where, ResultOf<Greater, XA, XB>, XA, XB>, Xs> &&
            ...)
    static inline constexpr decltype(auto) max(XA &&a, XB &&b, Xs &&...args)
    {
        return max(max(forward<XA>(a), forward<XB>(b)), forward<Xs>(args)...);
    }
}
#endif // pRC_CORE_BASIC_FUNCTIONS_MAX_H