Emily Boudreaux
ec13264050
A bug was discovered in glaze which prevented valid toml output. We have switched to toml++ and reflect-cpp. The interface has remained the same so this should not break any code
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
#pragma once
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#include "common.hpp"
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#include "details/optional.hpp"
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#include "enchantum.hpp"
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#include <cstddef>
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namespace enchantum {
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namespace details {
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template<std::ptrdiff_t N>
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struct next_value_functor {
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template<Enum E>
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[[nodiscard]] constexpr optional<E> operator()(const E value, const std::ptrdiff_t n = 1) const noexcept
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{
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if (!enchantum::contains(value))
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return optional<E>{};
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const auto index = static_cast<std::ptrdiff_t>(*enchantum::enum_to_index(value)) + (n * N);
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if (index >= 0 && index < static_cast<std::ptrdiff_t>(count<E>))
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return optional<E>{values<E>[static_cast<std::size_t>(index)]};
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return optional<E>{};
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}
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};
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template<std::ptrdiff_t N>
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struct next_value_circular_functor {
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template<Enum E>
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[[nodiscard]] constexpr E operator()(const E value, const std::ptrdiff_t n = 1) const noexcept
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{
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ENCHANTUM_ASSERT(enchantum::contains(value), "next/prev_value_circular requires 'value' to be a valid enum member", value);
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const auto i = static_cast<std::ptrdiff_t>(*enchantum::enum_to_index(value));
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constexpr auto count = static_cast<std::ptrdiff_t>(enchantum::count<E>);
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return values<E>[static_cast<std::size_t>(((i + (n * N)) % count + count) % count)]; // handles wrap around and negative n
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}
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};
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} // namespace details
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inline constexpr details::next_value_functor<1> next_value{};
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inline constexpr details::next_value_functor<-1> prev_value{};
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inline constexpr details::next_value_circular_functor<1> next_value_circular{};
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inline constexpr details::next_value_circular_functor<-1> prev_value_circular{};
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} // namespace enchantum
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