mirror of
https://github.com/ETLCPP/etl.git
synced 2026-06-30 06:18:50 +08:00
5ddc11b57d
* Add rvalue methods to optional and expected. * Fix constructors in expected.h. * Fix sanity checks. --------- Co-authored-by: John Wellbelove <jwellbelove@users.noreply.github.com>
947 lines
26 KiB
C++
947 lines
26 KiB
C++
///\file
|
|
|
|
/******************************************************************************
|
|
The MIT License(MIT)
|
|
|
|
Embedded Template Library.
|
|
https://github.com/ETLCPP/etl
|
|
https://www.etlcpp.com
|
|
|
|
Copyright(c) 2022 John Wellbelove
|
|
|
|
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 ETL_EXPECTED_INCLUDED
|
|
#define ETL_EXPECTED_INCLUDED
|
|
|
|
///\defgroup expected expected
|
|
///\ingroup utilities
|
|
#include "platform.h"
|
|
#include "exception.h"
|
|
#include "error_handler.h"
|
|
#include "utility.h"
|
|
#include "variant.h"
|
|
|
|
namespace etl
|
|
{
|
|
//***************************************************************************
|
|
/// Base exception for et::expected
|
|
//***************************************************************************
|
|
class expected_exception : public etl::exception
|
|
{
|
|
public:
|
|
|
|
expected_exception(string_type reason_, string_type file_name_, numeric_type line_number_)
|
|
: exception(reason_, file_name_, line_number_)
|
|
{
|
|
}
|
|
};
|
|
|
|
//***************************************************************************
|
|
/// expected_invalid
|
|
//***************************************************************************
|
|
template <typename TError>
|
|
class expected_invalid;
|
|
|
|
//*******************************************
|
|
template<>
|
|
class expected_invalid<void> : public etl::expected_exception
|
|
{
|
|
public:
|
|
|
|
expected_invalid(string_type file_name_, numeric_type line_number_)
|
|
: expected_exception(ETL_ERROR_TEXT("expected:invalid", ETL_EXPECTED_FILE_ID"A"), file_name_, line_number_)
|
|
{
|
|
}
|
|
};
|
|
|
|
//*******************************************
|
|
template <typename TError>
|
|
class expected_invalid : etl::expected_invalid<void>
|
|
{
|
|
public:
|
|
|
|
expected_invalid(string_type file_name_, numeric_type line_number_)
|
|
: expected_invalid<void>(file_name_, line_number_)
|
|
{
|
|
}
|
|
};
|
|
|
|
//***************************************************************************
|
|
/// Unexpected type.
|
|
/// etl::unexpected represents an unexpected value stored in etl::expected.
|
|
//***************************************************************************
|
|
template <typename TError>
|
|
class unexpected
|
|
{
|
|
public:
|
|
|
|
typedef TError error_type;
|
|
|
|
//*******************************************
|
|
/// Copy constructor.
|
|
//*******************************************
|
|
ETL_CONSTEXPR unexpected(const unexpected& other)
|
|
: error_value(other.error_value)
|
|
{
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move constructor.
|
|
//*******************************************
|
|
ETL_CONSTEXPR unexpected(unexpected&& other)
|
|
: error_value(etl::move(other.error_value))
|
|
{
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Construct from an lvalue.
|
|
//*******************************************
|
|
ETL_CONSTEXPR explicit unexpected(const TError& e)
|
|
: error_value(e)
|
|
{
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Construct from an rvalue.
|
|
//*******************************************
|
|
ETL_CONSTEXPR explicit unexpected(TError&& e)
|
|
: error_value(etl::forward<TError>(e))
|
|
{
|
|
}
|
|
|
|
//*******************************************
|
|
/// Construct from arguments.
|
|
//*******************************************
|
|
template <typename... Args >
|
|
ETL_CONSTEXPR explicit unexpected(etl::in_place_t, Args&&... args)
|
|
: error_value(etl::forward<Args>(args)...)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#if ETL_HAS_INITIALIZER_LIST
|
|
//*******************************************
|
|
/// Construct from initializer_list and arguments.
|
|
//*******************************************
|
|
template <typename U, typename... Args>
|
|
ETL_CONSTEXPR explicit unexpected(etl::in_place_t, std::initializer_list<U> init, Args&&... args)
|
|
: error_value(init, etl::forward<Args>(args)...)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Assign from etl::unexpected.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14
|
|
etl::unexpected<TError>& operator =(const etl::unexpected<TError>& rhs)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_copy_constructible<TError>::value, "Error not copy assignable");
|
|
|
|
error_value = rhs.error_value;
|
|
return *this;
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move assign from etl::unexpected.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14
|
|
etl::unexpected<TError>& operator =(etl::unexpected<TError>&& rhs)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_move_constructible<TError>::value, "Error not move assignable");
|
|
|
|
error_value = etl::move(rhs.error_value);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Get the error.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 TError& error()& ETL_NOEXCEPT
|
|
{
|
|
return error_value;
|
|
}
|
|
|
|
//*******************************************
|
|
/// Get the error.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 const TError& error() const& ETL_NOEXCEPT
|
|
{
|
|
return error_value;
|
|
}
|
|
|
|
//*******************************************
|
|
/// Get the error.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 TError&& error()&& ETL_NOEXCEPT
|
|
{
|
|
return etl::move(error_value);
|
|
}
|
|
|
|
//*******************************************
|
|
/// Get the error.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 TError&& error() const&& ETL_NOEXCEPT
|
|
{
|
|
return etl::move(error_value);
|
|
}
|
|
#else
|
|
//*******************************************
|
|
/// Get the error.
|
|
//*******************************************
|
|
const TError& error() const
|
|
{
|
|
return error_value;
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Swap with another etl::unexpected.
|
|
//*******************************************
|
|
void swap(etl::unexpected<TError>& other)
|
|
{
|
|
using ETL_OR_STD::swap;
|
|
|
|
swap(error_value, other.error_value);
|
|
}
|
|
|
|
private:
|
|
|
|
TError error_value;
|
|
};
|
|
|
|
//*****************************************************************************
|
|
/// unexpect_t
|
|
//*****************************************************************************
|
|
struct unexpect_t
|
|
{
|
|
ETL_CONSTEXPR14 explicit unexpect_t()
|
|
{
|
|
}
|
|
};
|
|
|
|
#if ETL_USING_CPP17
|
|
inline ETL_CONSTEXPR unexpect_t unexpect{};
|
|
#else
|
|
static const unexpect_t unexpect;
|
|
#endif
|
|
|
|
//*****************************************************************************
|
|
/// Expected type.
|
|
//*****************************************************************************
|
|
template <typename TValue, typename TError>
|
|
class expected
|
|
{
|
|
public:
|
|
|
|
typedef etl::expected<TValue, TError> this_type;
|
|
typedef TValue value_type;
|
|
typedef TError error_type;
|
|
typedef etl::unexpected<TError> unexpected_type;
|
|
|
|
#if ETL_USING_CPP11
|
|
template <typename U>
|
|
using rebind = expected<U, TError>;
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Default constructor
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 expected() ETL_NOEXCEPT
|
|
: storage(etl::in_place_index_t<Value_Type>(), value_type())
|
|
{
|
|
}
|
|
|
|
//*******************************************
|
|
/// Constructor
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 expected(const value_type& value_) ETL_NOEXCEPT
|
|
: storage(etl::in_place_index_t<Value_Type>(), value_)
|
|
{
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Constructor
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 expected(value_type&& value_) ETL_NOEXCEPT
|
|
: storage(etl::in_place_index_t<Value_Type>(), etl::move(value_))
|
|
{
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Copy constructor
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 expected(const expected& other) ETL_NOEXCEPT
|
|
: storage(other.storage)
|
|
{
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move constructor
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 expected(expected&& other) ETL_NOEXCEPT
|
|
: storage(etl::move(other.storage))
|
|
{
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Copy construct from unexpected type.
|
|
//*******************************************
|
|
template <typename G>
|
|
ETL_CONSTEXPR14
|
|
ETL_EXPLICIT_EXPR(!etl::is_convertible_v<const G&, TError>)
|
|
expected(const etl::unexpected<G>& ue)
|
|
: storage(etl::in_place_index_t<Error_Type>(), ue.error())
|
|
{
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move construct from unexpected type.
|
|
//*******************************************
|
|
template <typename G>
|
|
ETL_CONSTEXPR14
|
|
ETL_EXPLICIT_EXPR(!etl::is_convertible_v<G, TError>)
|
|
expected(etl::unexpected<G>&& ue)
|
|
: storage(etl::in_place_index_t<Error_Type>(), etl::move(ue.error()))
|
|
{
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Construct with default value type.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 explicit expected(etl::in_place_t) ETL_NOEXCEPT
|
|
: storage(value_type())
|
|
{
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Construct value type from arguments.
|
|
//*******************************************
|
|
template <typename... Args>
|
|
ETL_CONSTEXPR14 explicit expected(etl::in_place_t, Args&&... args)
|
|
: storage(etl::forward<Args>(args)...)
|
|
{
|
|
}
|
|
|
|
//*******************************************
|
|
/// Construct value type from initializser_list and arguments.
|
|
//*******************************************
|
|
template <typename U, typename... Args>
|
|
ETL_CONSTEXPR14 explicit expected(etl::in_place_t, std::initializer_list<U> il, Args&&... args)
|
|
: storage(il, etl::forward<Args>(args)...)
|
|
{
|
|
}
|
|
|
|
//*******************************************
|
|
/// Construct error type from arguments.
|
|
//*******************************************
|
|
template <typename... Args>
|
|
ETL_CONSTEXPR14 explicit expected(etl::unexpect_t, Args&&... args)
|
|
: storage(error_type(etl::forward<Args>(args)...))
|
|
{
|
|
}
|
|
|
|
#if ETL_HAS_INITIALIZER_LIST
|
|
//*******************************************
|
|
/// Construct error type from initializser_list and arguments.
|
|
//*******************************************
|
|
template <typename U, typename... Args>
|
|
ETL_CONSTEXPR14 explicit expected(etl::unexpect_t, std::initializer_list<U> il, Args&&... args)
|
|
: storage(error_type(il, etl::forward<Args>(args)...))
|
|
{
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
this_type& operator =(const this_type& other)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_copy_constructible<TValue>::value && etl::is_copy_constructible<TError>::value, "Not copy assignable");
|
|
|
|
storage = other.storage;
|
|
|
|
return *this;
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
this_type& operator =(this_type&& other)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_move_constructible<TValue>::value && etl::is_move_constructible<TError>::value, "Not move assignable");
|
|
|
|
storage = etl::move(other.storage);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Copy assign from value
|
|
//*******************************************
|
|
expected& operator =(const value_type& value)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_copy_constructible<TValue>::value, "Value not copy assignable");
|
|
|
|
storage.template emplace<Value_Type>(value);
|
|
return *this;
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move assign from value
|
|
//*******************************************
|
|
expected& operator =(value_type&& value)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_move_constructible<TValue>::value, "Value not move assignable");
|
|
|
|
storage.template emplace<Value_Type>(etl::move(value));
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Copy assign from error
|
|
//*******************************************
|
|
expected& operator =(const unexpected_type& error)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_copy_constructible<TError>::value, "Error not copy assignable");
|
|
|
|
storage.template emplace<Error_Type>(error);
|
|
return *this;
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move assign from error
|
|
//*******************************************
|
|
expected& operator =(unexpected_type&& error)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_move_constructible<TError>::value, "Error not move assignable");
|
|
|
|
storage.template emplace<Error_Type>(etl::move(error));
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Get the value.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 value_type& value()&
|
|
{
|
|
return etl::get<Value_Type>(storage);
|
|
}
|
|
|
|
//*******************************************
|
|
/// Get the value.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 const value_type& value() const&
|
|
{
|
|
return etl::get<Value_Type>(storage);
|
|
}
|
|
|
|
//*******************************************
|
|
/// Get the value.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 value_type&& value()&&
|
|
{
|
|
return etl::move(etl::get<Value_Type>(storage));
|
|
}
|
|
|
|
//*******************************************
|
|
/// Get the value.
|
|
//*******************************************
|
|
ETL_CONSTEXPR14 const value_type&& value() const&&
|
|
{
|
|
return etl::move(etl::get<Value_Type>(storage));
|
|
}
|
|
#else
|
|
//*******************************************
|
|
/// Get the value.
|
|
//*******************************************
|
|
value_type& value() const
|
|
{
|
|
return etl::get<Value_Type>(storage);
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
bool has_value() const
|
|
{
|
|
return (storage.index() == Value_Type);
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
operator bool() const
|
|
{
|
|
return has_value();
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
template <typename U>
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
value_type value_or(U&& default_value) const&
|
|
{
|
|
if (has_value())
|
|
{
|
|
return value();
|
|
}
|
|
else
|
|
{
|
|
return default_value;
|
|
}
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
template <typename U>
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
value_type value_or(U&& default_value)&&
|
|
{
|
|
if (has_value())
|
|
{
|
|
return etl::move(value());
|
|
}
|
|
else
|
|
{
|
|
return etl::move(default_value);
|
|
}
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
error_type& error()& ETL_NOEXCEPT
|
|
{
|
|
return etl::get<Error_Type>(storage);
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
const error_type& error() const& ETL_NOEXCEPT
|
|
{
|
|
return etl::get<Error_Type>(storage);
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
error_type&& error()&& ETL_NOEXCEPT
|
|
{
|
|
return etl::move(etl::get<Error_Type>(storage));
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
const error_type&& error() const&& ETL_NOEXCEPT
|
|
{
|
|
return etl::move(etl::get<Error_Type>(storage));
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
template <typename... Args>
|
|
ETL_CONSTEXPR14 value_type& emplace(Args&&... args) ETL_NOEXCEPT
|
|
{
|
|
storage.emplace(args...);
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
template <typename U, typename... Args>
|
|
ETL_CONSTEXPR14 value_type& emplace(std::initializer_list<U>& il, Args&&... args) ETL_NOEXCEPT
|
|
{
|
|
storage.emplace(il, args...);
|
|
}
|
|
#else
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
template <typename U>
|
|
value_type value_or(const U& default_value) const
|
|
{
|
|
if (has_value())
|
|
{
|
|
return value();
|
|
}
|
|
else
|
|
{
|
|
return default_value;
|
|
}
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
error_type& error() const
|
|
{
|
|
return etl::get<Error_Type>(storage);
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
value_type* operator ->()
|
|
{
|
|
#if ETL_IS_DEBUG_BUILD
|
|
ETL_ASSERT(storage.index() == Value_Type, ETL_ERROR(expected_invalid<TError>));
|
|
#endif
|
|
|
|
return etl::addressof(etl::get<value_type>(storage));
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
const value_type* operator ->() const
|
|
{
|
|
#if ETL_IS_DEBUG_BUILD
|
|
ETL_ASSERT(storage.index() == Value_Type, ETL_ERROR(expected_invalid<TError>));
|
|
#endif
|
|
|
|
return etl::addressof(etl::get<value_type>(storage));
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
value_type& operator *() ETL_LVALUE_REF_QUALIFIER
|
|
{
|
|
#if ETL_IS_DEBUG_BUILD
|
|
ETL_ASSERT(storage.index() == Value_Type, ETL_ERROR(expected_invalid<TError>));
|
|
#endif
|
|
|
|
return etl::get<value_type>(storage);
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
const value_type& operator *() const ETL_LVALUE_REF_QUALIFIER
|
|
{
|
|
#if ETL_IS_DEBUG_BUILD
|
|
ETL_ASSERT(storage.index() == Value_Type, ETL_ERROR(expected_invalid<TError>));
|
|
#endif
|
|
|
|
return etl::get<value_type>(storage);
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
value_type&& operator *()&&
|
|
{
|
|
#if ETL_IS_DEBUG_BUILD
|
|
ETL_ASSERT(storage.index() == Value_Type, ETL_ERROR(expected_invalid<TError>));
|
|
#endif
|
|
|
|
return etl::move(etl::get<value_type>(storage));
|
|
}
|
|
|
|
//*******************************************
|
|
///
|
|
//*******************************************
|
|
const value_type&& operator *() const&&
|
|
{
|
|
#if ETL_IS_DEBUG_BUILD
|
|
ETL_ASSERT(storage.index() == Value_Type, ETL_ERROR(expected_invalid<TError>));
|
|
#endif
|
|
|
|
return etl::move(etl::get<value_type>(storage));
|
|
}
|
|
#endif
|
|
|
|
private:
|
|
|
|
enum
|
|
{
|
|
Uninitialised,
|
|
Value_Type,
|
|
Error_Type
|
|
};
|
|
|
|
typedef etl::variant<etl::monostate, value_type, error_type> storage_type;
|
|
storage_type storage;
|
|
};
|
|
|
|
//*****************************************************************************
|
|
/// Specialisation for void value type.
|
|
//*****************************************************************************
|
|
template<typename TError>
|
|
class expected<void, TError>
|
|
{
|
|
public:
|
|
|
|
typedef etl::expected<void, TError> this_type;
|
|
typedef void value_type;
|
|
typedef TError error_type;
|
|
typedef etl::unexpected<TError> unexpected_type;
|
|
|
|
//*******************************************
|
|
/// Default constructor
|
|
//*******************************************
|
|
ETL_CONSTEXPR14
|
|
expected()
|
|
{
|
|
}
|
|
|
|
//*******************************************
|
|
/// Copy construct from unexpected
|
|
//*******************************************
|
|
ETL_CONSTEXPR14
|
|
expected(const unexpected_type& ue_)
|
|
: storage(ue_.error())
|
|
{
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move construct from unexpected
|
|
//*******************************************
|
|
ETL_CONSTEXPR14
|
|
expected(unexpected_type&& ue_)
|
|
: storage(etl::move(ue_.error()))
|
|
{
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Copy construct
|
|
//*******************************************
|
|
ETL_CONSTEXPR14
|
|
expected(const this_type& other)
|
|
: storage(other.storage)
|
|
{
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move construct
|
|
//*******************************************
|
|
ETL_CONSTEXPR14
|
|
expected(this_type&& other)
|
|
: storage(etl::move(other.storage))
|
|
{
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Copy assign
|
|
//*******************************************
|
|
this_type& operator =(const this_type& other)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_copy_constructible<TError>::value, "Not copy assignable");
|
|
|
|
storage = other.storage;
|
|
return *this;
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move assign
|
|
//*******************************************
|
|
this_type& operator =(this_type&& other)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_move_constructible<TError>::value, "Not move assignable");
|
|
|
|
storage = etl::move(other.storage);
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Copy assign from error
|
|
//*******************************************
|
|
expected& operator =(const unexpected_type& error)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_copy_constructible<TError>::value, "Error not copy assignable");
|
|
|
|
storage.template emplace<Error_Type>(error);
|
|
return *this;
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Move assign from error
|
|
//*******************************************
|
|
expected& operator =(unexpected_type&& error)
|
|
{
|
|
ETL_STATIC_ASSERT(etl::is_move_constructible<TError>::value, "Error not move assignable");
|
|
|
|
storage.template emplace<Error_Type>(etl::move(error));
|
|
return *this;
|
|
}
|
|
#endif
|
|
|
|
//*******************************************
|
|
/// Returns true if expected has a value
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
bool has_value() const
|
|
{
|
|
return (storage.index() != Error_Type);
|
|
}
|
|
|
|
//*******************************************
|
|
/// Returns true if expected has a value
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
operator bool() const
|
|
{
|
|
return has_value();
|
|
}
|
|
|
|
#if ETL_USING_CPP11
|
|
//*******************************************
|
|
/// Returns the error
|
|
/// Undefined behaviour if an error has not been set.
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
error_type& error()& ETL_NOEXCEPT
|
|
{
|
|
return etl::get<Error_Type>(storage);
|
|
}
|
|
|
|
//*******************************************
|
|
/// Returns the error
|
|
/// Undefined behaviour if an error has not been set.
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
const error_type& error() const& ETL_NOEXCEPT
|
|
{
|
|
return etl::get<Error_Type>(storage);
|
|
}
|
|
|
|
//*******************************************
|
|
/// Returns the error
|
|
/// Undefined behaviour if an error has not been set.
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
error_type&& error() && ETL_NOEXCEPT
|
|
{
|
|
return etl::move(etl::get<Error_Type>(storage));
|
|
}
|
|
|
|
//*******************************************
|
|
/// Returns the error
|
|
/// Undefined behaviour if an error has not been set.
|
|
//*******************************************
|
|
ETL_NODISCARD
|
|
ETL_CONSTEXPR14
|
|
const error_type&& error() const&& ETL_NOEXCEPT
|
|
{
|
|
return etl::move(etl::get<Error_Type>(storage));
|
|
}
|
|
#else
|
|
//*******************************************
|
|
/// Returns the error
|
|
/// Undefined behaviour if an error has not been set.
|
|
//*******************************************
|
|
error_type& error() const
|
|
{
|
|
return etl::get<Error_Type>(storage);
|
|
}
|
|
#endif
|
|
|
|
private:
|
|
|
|
enum
|
|
{
|
|
Uninitialised,
|
|
Error_Type
|
|
};
|
|
|
|
etl::variant<etl::monostate, error_type> storage;
|
|
};
|
|
}
|
|
|
|
//*******************************************
|
|
/// Equivalence operator.
|
|
//*******************************************
|
|
template <typename TError>
|
|
ETL_CONSTEXPR14
|
|
bool operator ==(const etl::unexpected<TError>& lhs, const etl::unexpected<TError>& rhs)
|
|
{
|
|
return lhs.error_value == rhs.error_value;
|
|
}
|
|
|
|
//*******************************************
|
|
/// Swap etl::unexpected.
|
|
//*******************************************
|
|
template <typename TError>
|
|
ETL_CONSTEXPR14
|
|
void swap(etl::unexpected<TError>& lhs, etl::unexpected<TError>& rhs)
|
|
{
|
|
lhs.swap(rhs);
|
|
}
|
|
|
|
#endif
|
|
|