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Original file line number | Diff line number | Diff line change |
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//==-------- optional.hpp - limited variant of std::optional -------- C++ --==// | ||
// | ||
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
// See https://llvm.org/LICENSE.txt for license information. | ||
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
// | ||
// ===--------------------------------------------------------------------=== // | ||
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#pragma once | ||
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#include <optional> | ||
#include <type_traits> | ||
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namespace sycl { | ||
inline namespace _V1 { | ||
namespace detail { | ||
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// ABI-stable implementation of optional to avoid reliance on potentially | ||
// differing implementations of std::optional when crossing the library | ||
// boundary. | ||
template <typename T> class optional { | ||
public: | ||
constexpr optional() noexcept {} | ||
constexpr optional(std::nullopt_t) noexcept : optional() {} | ||
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template <typename U> | ||
constexpr optional(const optional<U> &Other) | ||
: ContainsValue{Other.ContainsValue} { | ||
new (Storage) T(Other.Value); | ||
} | ||
template <typename U> | ||
constexpr optional(optional<U> &&Other) | ||
: ContainsValue{std::move(Other.ContainsValue)} { | ||
new (Storage) T(std::move(Other.Value)); | ||
} | ||
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constexpr optional(T &&Value) : ContainsValue{true} { | ||
new (Storage) T(std::move(Value)); | ||
} | ||
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constexpr optional(const T &Value) : ContainsValue{true} { | ||
new (Storage) T(Value); | ||
} | ||
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template <typename U> | ||
constexpr optional(const std::optional<U> &Other) : ContainsValue{Other} { | ||
if (Other) | ||
new (Storage) T(*Other); | ||
} | ||
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~optional() { | ||
if (has_value()) | ||
reinterpret_cast<T *>(Storage)->~T(); | ||
} | ||
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optional &operator=(std::nullopt_t) noexcept { | ||
if (has_value()) | ||
reinterpret_cast<T *>(Storage)->~T(); | ||
ContainsValue = false; | ||
return *this; | ||
} | ||
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template <typename U> optional &operator=(const optional<U> &Other) { | ||
if (has_value()) | ||
reinterpret_cast<T *>(Storage)->~T(); | ||
ContainsValue = Other; | ||
new (Storage) T(Other.Value); | ||
return *this; | ||
} | ||
template <typename U> optional &operator=(optional<U> &&Other) noexcept { | ||
if (has_value()) | ||
reinterpret_cast<T *>(Storage)->~T(); | ||
ContainsValue = Other; | ||
new (Storage) T(std::move(Other.Value)); | ||
return *this; | ||
} | ||
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optional &operator=(T &&Value) { | ||
if (has_value()) | ||
reinterpret_cast<T *>(Storage)->~T(); | ||
ContainsValue = true; | ||
new (Storage) T(std::move(Value)); | ||
return *this; | ||
} | ||
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optional &operator=(const T &Value) { | ||
if (has_value()) | ||
reinterpret_cast<T *>(Storage)->~T(); | ||
ContainsValue = true; | ||
new (Storage) T(Value); | ||
return *this; | ||
} | ||
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template <typename U> optional &operator=(const std::optional<U> &Other) { | ||
if (has_value()) | ||
reinterpret_cast<T *>(Storage)->~T(); | ||
ContainsValue = Other; | ||
if (Other) | ||
new (Storage) T(*Other); | ||
return *this; | ||
} | ||
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constexpr bool has_value() const noexcept { return ContainsValue; } | ||
constexpr explicit operator bool() const noexcept { return has_value(); } | ||
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constexpr T &value() & { | ||
if (!has_value()) | ||
throw std::bad_optional_access{}; | ||
return *reinterpret_cast<T *>(Storage); | ||
} | ||
constexpr const T &value() const & { | ||
if (!has_value()) | ||
throw std::bad_optional_access{}; | ||
return *reinterpret_cast<const T *>(Storage); | ||
} | ||
constexpr T &&value() && { | ||
if (!has_value()) | ||
throw std::bad_optional_access{}; | ||
return std::move(*reinterpret_cast<T *>(Storage)); | ||
} | ||
constexpr const T &&value() const && { | ||
if (!has_value()) | ||
throw std::bad_optional_access{}; | ||
return std::move(*reinterpret_cast<const T *>(Storage)); | ||
} | ||
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template <class U> constexpr T value_or(U &&DefaultVal) { | ||
return has_value() ? value() : static_cast<T>(std::forward<U>(DefaultVal)); | ||
} | ||
template <class U> constexpr T value_or(U &&DefaultVal) const { | ||
return has_value() ? std::move(value()) | ||
: static_cast<T>(std::forward<U>(DefaultVal)); | ||
} | ||
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constexpr T &operator*() & { return value(); } | ||
constexpr const T &operator*() const & { return value(); } | ||
constexpr T &&operator*() && { return value(); } | ||
constexpr const T &&operator*() const && { return value(); } | ||
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private: | ||
alignas(alignof(T)) char Storage[sizeof(T)] = {0}; | ||
bool ContainsValue = false; | ||
}; | ||
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} // namespace detail | ||
} // namespace _V1 | ||
} // namespace sycl |
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