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https://github.com/zerotier/ZeroTierOne.git
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75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include <type_traits>
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#include "opentelemetry/nostd/type_traits.h"
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#include "opentelemetry/version.h"
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OPENTELEMETRY_BEGIN_NAMESPACE
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namespace nostd
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{
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namespace detail
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{
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enum class Trait
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{
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TriviallyAvailable,
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Available,
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Unavailable
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};
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template <typename T,
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template <typename>
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class IsTriviallyAvailable,
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template <typename>
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class IsAvailable>
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inline constexpr Trait trait()
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{
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return IsTriviallyAvailable<T>::value ? Trait::TriviallyAvailable
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: IsAvailable<T>::value ? Trait::Available
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: Trait::Unavailable;
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}
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inline constexpr Trait common_trait_impl(Trait result)
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{
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return result;
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}
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template <typename... Traits>
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inline constexpr Trait common_trait_impl(Trait result, Trait t, Traits... ts)
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{
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return static_cast<int>(t) > static_cast<int>(result) ? common_trait_impl(t, ts...)
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: common_trait_impl(result, ts...);
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}
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template <typename... Traits>
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inline constexpr Trait common_trait(Traits... ts)
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{
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return common_trait_impl(Trait::TriviallyAvailable, ts...);
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}
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template <typename... Ts>
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struct traits
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{
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static constexpr Trait copy_constructible_trait =
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common_trait(trait<Ts, is_trivially_copy_constructible, std::is_copy_constructible>()...);
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static constexpr Trait move_constructible_trait =
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common_trait(trait<Ts, is_trivially_move_constructible, std::is_move_constructible>()...);
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static constexpr Trait copy_assignable_trait =
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common_trait(copy_constructible_trait,
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trait<Ts, is_trivially_copy_assignable, std::is_copy_assignable>()...);
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static constexpr Trait move_assignable_trait =
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common_trait(move_constructible_trait,
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trait<Ts, is_trivially_move_assignable, std::is_move_assignable>()...);
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static constexpr Trait destructible_trait =
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common_trait(trait<Ts, std::is_trivially_destructible, std::is_destructible>()...);
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};
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} // namespace detail
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} // namespace nostd
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OPENTELEMETRY_END_NAMESPACE
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