between.hpp

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#ifndef EAGINE_VALID_IF_BETWEEN_HPP
#define EAGINE_VALID_IF_BETWEEN_HPP
 
#include "decl.hpp"
 
namespace eagine {
 
template <typename T, typename C, C Min, C Max>
struct valid_if_btwn_policy {
 
    constexpr auto operator()(T value) const noexcept {
        return (T(Min) <= value) && (value <= T(Max));
    }
 
    struct do_log {
        template <typename X, typename = disable_if_same_t<X, do_log>>
        constexpr do_log(X&&) noexcept {}
 
        template <typename Log>
        void operator()(Log& log, const T& v) const {
            log << "Value " << v << ", not between " << Min << " and " << Max
                << " is invalid";
        }
    };
};
 
template <typename T, typename C, C Min, C Max>
using valid_if_between_c = valid_if<T, valid_if_btwn_policy<T, C, Min, Max>>;
 
template <typename T, T Min, T Max>
using valid_if_between = valid_if_between_c<T, T, Min, Max>;
 
} // namespace eagine
 
#endif // EAGINE_VALID_IF_BETWEEN_HPP