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// sol2
// The MIT License (MIT)
// Copyright (c) 2013-2022 Rapptz, ThePhD and contributors
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#ifndef SOL_EBCO_HPP
#define SOL_EBCO_HPP
#include <type_traits>
#include <utility>
#include <memory>
namespace sol { namespace detail {
template <typename T, std::size_t tag = 0, typename = void>
struct ebco {
T m_value;
ebco() = default;
ebco(const ebco&) = default;
ebco(ebco&&) = default;
ebco& operator=(const ebco&) = default;
ebco& operator=(ebco&&) = default;
ebco(const T& v) noexcept(std::is_nothrow_copy_constructible_v<T>) : m_value(v) {};
ebco(T&& v) noexcept(std::is_nothrow_move_constructible_v<T>) : m_value(std::move(v)) {};
ebco& operator=(const T& v) noexcept(std::is_nothrow_copy_assignable_v<T>) {
m_value = v;
return *this;
}
ebco& operator=(T&& v) noexcept(std::is_nothrow_move_assignable_v<T>) {
m_value = std::move(v);
return *this;
};
template <typename Arg, typename... Args,
typename = std::enable_if_t<
!std::is_same_v<std::remove_reference_t<std::remove_cv_t<Arg>>,
ebco> && !std::is_same_v<std::remove_reference_t<std::remove_cv_t<Arg>>, T> && (sizeof...(Args) > 0 || !std::is_convertible_v<Arg, T>)>>
ebco(Arg&& arg, Args&&... args) noexcept(std::is_nothrow_constructible_v<T, Arg, Args...>)
: m_value(std::forward<Arg>(arg), std::forward<Args>(args)...) {
}
T& value() & noexcept {
return m_value;
}
T const& value() const& noexcept {
return m_value;
}
T&& value() && noexcept {
return std::move(m_value);
}
};
template <typename T, std::size_t tag>
struct ebco<T, tag, std::enable_if_t<!std::is_reference_v<T> && std::is_class_v<T> && !std::is_final_v<T>>> : T {
ebco() = default;
ebco(const ebco&) = default;
ebco(ebco&&) = default;
ebco(const T& v) noexcept(std::is_nothrow_copy_constructible_v<T>) : T(v) {};
ebco(T&& v) noexcept(std::is_nothrow_move_constructible_v<T>) : T(std::move(v)) {};
template <typename Arg, typename... Args,
typename = std::enable_if_t<
!std::is_same_v<std::remove_reference_t<std::remove_cv_t<Arg>>,
ebco> && !std::is_same_v<std::remove_reference_t<std::remove_cv_t<Arg>>, T> && (sizeof...(Args) > 0 || !std::is_convertible_v<Arg, T>)>>
ebco(Arg&& arg, Args&&... args) noexcept(std::is_nothrow_constructible_v<T, Arg, Args...>) : T(std::forward<Arg>(arg), std::forward<Args>(args)...) {
}
ebco& operator=(const ebco&) = default;
ebco& operator=(ebco&&) = default;
ebco& operator=(const T& v) noexcept(std::is_nothrow_copy_assignable_v<T>) {
static_cast<T&>(*this) = v;
return *this;
}
ebco& operator=(T&& v) noexcept(std::is_nothrow_move_assignable_v<T>) {
static_cast<T&>(*this) = std::move(v);
return *this;
};
T& value() & noexcept {
return static_cast<T&>(*this);
}
T const& value() const& noexcept {
return static_cast<T const&>(*this);
}
T&& value() && noexcept {
return std::move(static_cast<T&>(*this));
}
};
template <typename T, std::size_t tag>
struct ebco<T&, tag> {
private:
T* m_ref;
public:
ebco() = default;
ebco(const ebco&) = default;
ebco(ebco&&) = default;
ebco(T& v) noexcept : m_ref(std::addressof(v)) {};
ebco& operator=(const ebco&) = default;
ebco& operator=(ebco&&) = default;
ebco& operator=(T& v) noexcept {
m_ref = std::addressof(v);
return *this;
}
T& value() const noexcept {
return *(const_cast<ebco<T&, tag>&>(*this).m_ref);
}
};
template <typename T, std::size_t tag>
struct ebco<T&&, tag> {
T&& ref;
ebco() = default;
ebco(const ebco&) = delete;
ebco(ebco&&) = default;
ebco(T&& v) noexcept : ref(v) {};
ebco& operator=(const ebco&) = delete;
ebco& operator=(ebco&&) = delete;
T& value() & noexcept {
return ref;
}
const T& value() const& noexcept {
return ref;
}
T&& value() && noexcept {
return std::move(ref);
}
};
}} // namespace sol::detail
#endif // SOL_EBCO_HPP
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