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https://github.com/ETLCPP/etl.git
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Work-In-Progress
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John Wellbelove
John Wellbelove
parent
f858b36e82
commit
bdea8c1622
@ -31,6 +31,8 @@ SOFTWARE.
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#ifndef ETL_EXPECTED_INCLUDED
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#define ETL_EXPECTED_INCLUDED
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///\defgroup expected expected
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///\ingroup utilities
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#include "platform.h"
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#include "type_traits.h"
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#include "utility.h"
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@ -49,7 +51,7 @@ namespace etl
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//*******************************************
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/// Copy constructor.
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//*******************************************
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ETL_CONSTEXPR14 unexpected(const unexpected& other)
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ETL_CONSTEXPR unexpected(const unexpected& other)
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: error_value(other.error_value)
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{
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}
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@ -62,25 +64,24 @@ namespace etl
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: error_value(etl::move(other.error_value))
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{
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}
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#endif
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#if ETL_USING_CPP11
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#if ETL_CPP11_SUPPORTED
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//*******************************************
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/// Construct from argument.
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//*******************************************
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template <typename TErr = TError, typename = typename etl::enable_if<!etl::is_same<typename etl::remove_cvref<TErr>::type, etl::unexpected<TErr>>::value &&
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!etl::is_same<typename etl::remove_cvref<TErr>::type, etl::in_place_t>::value, int>::type>
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constexpr explicit unexpected(TErr&& e)
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: error_value(etl::forward<TErr>(e))
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template <typename E = TError, typename = typename etl::enable_if<!etl::is_same<typename etl::remove_cvref<Err>::type, etl::unexpected>::value &&
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!etl::is_same<typename etl::remove_cvref<Err>::type, etl::in_place_t>::value, int>::type>
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constexpr explicit unexpected(E&& e)
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: error_value(etl::forward<TError>(e))
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{
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}
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#else
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//*******************************************
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/// Construct from argument.
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//*******************************************
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template <typename TErr>
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explicit unexpected(const TErr& e, typename etl::enable_if<!etl::is_same<typename etl::remove_cvref<TErr>::type, etl::unexpected<TErr> >::value &&
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!etl::is_same<typename etl::remove_cvref<TErr>::type, etl::in_place_t>::value, int>::type = 0)
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template <typename E>
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explicit unexpected(const E& e, typename etl::enable_if<!etl::is_same<typename etl::remove_cvref<Err>::type, etl::unexpected>::value &&
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!etl::is_same<typename etl::remove_cvref<Err>::type, etl::in_place_t>::value, int>::type = 0)
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: error_value(e)
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{
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}
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@ -208,6 +209,11 @@ namespace etl
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TError error_value;
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};
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#if ETL_USING_CPP17
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template <typename TError>
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unexpected(TError) -> unexpected<TError>;
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#endif
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#if ETL_USING_CPP17
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template <typename TError>
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unexpected(TError) -> unexpected<TError>;
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@ -251,3 +257,332 @@ static const unexpect_t unexpect;
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#endif
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#endif
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//*******************************************
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/// Equivalence operator.
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//*******************************************
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template <typename TError>
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bool operator ==(const etl::unexpected<TError>& lhs, const etl::unexpected<TError>& rhs)
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{
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return lhs.error_value == rhs.error_value;
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}
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//*******************************************
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/// Swap etl::unexpected.
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//*******************************************
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template <typename TError>
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void swap(etl::unexpected<TError>& lhs, etl::unexpected<TError>& rhs)
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{
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lhs.swap(rhs);
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}
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//*****************************************************************************
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/// unexpect_t
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//*****************************************************************************
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struct unexpect_t
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{
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explicit unexpect_t()
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{
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}
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};
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inline ETL_CONSTEXPR14 unexpect_t unexpect{};
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//*****************************************************************************
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/// Expected type.
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//*****************************************************************************
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template <typename TValue, typename TError>
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class expected
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{
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public:
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typename TValue value_type;
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typename TError error_type;
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typename etl::unexpected<TError> unexpected_type;
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#if ETL_CPP11_SUPPORTED
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template <typename U>
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using rebind = etl::expected<U, error_type>;
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#endif
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//*******************************************
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/// Default constructor
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//*******************************************
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ETL_CONSTEXPR14 expected(const expected& other) ETL_NOEXCEPT
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: data(TValue())
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{
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}
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//*******************************************
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/// Copy constructor
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//*******************************************
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ETL_CONSTEXPR14 expected(const expected& other)
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: data(other.data)
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{
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}
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#if ETL_CPP11_SUPPORTED
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//*******************************************
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/// Move constructor
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//*******************************************
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ETL_CONSTEXPR14 expected(expected&& other) ETL_NOEXCEPT
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: data(etl::move(other.data))
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{
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}
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#endif
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template <typename U, typename F>
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constexpr explicit() expected(const expected<U, F>& other)
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{
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}
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template <typename U, typename F>
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constexpr explicit(expected(expected<U, F>&& other)
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{
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}
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#if ETL_CPP11_SUPPORTED
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template <typename U = T>
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constexpr explicit expected(U&& v)
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{
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}
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#endif
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template <typename F>
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constexpr explicit expected(const etl::unexpected<F>& e)
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{
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}
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#if ETL_CPP11_SUPPORTED
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template <typename F>
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constexpr explicit expected(etl::unexpected<F>&& e)
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{
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}
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#endif
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constexpr explicit expected(etl::in_place_t) noexcept
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{
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}
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template <typename... Args>
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constexpr explicit expected(etl::in_place_t, Args&&... args)
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{
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}
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template <typename U, typename... Args>
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constexpr explicit expected(etl::in_place_t, std::initializer_list<U> il, Args&&... args)
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{
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}
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template <typename... Args>
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constexpr explicit expected(etl::unexpect_t, Args&&... args)
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{
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}
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template <typename U, typename... Args>
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constexpr explicit expected(etl::unexpect_t, std::initializer_list<U> il, Args&&... args)
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{
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}
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// //*******************************************
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// // Construct from a value
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// //*******************************************
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// expected(const TValue& value)
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// : data(value)
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// {
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// }
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//
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//#if ETL_CPP11_SUPPORTED
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// //*******************************************
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// // Move construct from a value
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// //*******************************************
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// expected(TValue&& value)
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// : data(etl::move(value))
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// {
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// }
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//#endif
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////*******************************************
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///// Construct from error
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////*******************************************
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//expected(const TError& error)
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// : data(error)
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//{
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//}
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////*******************************************
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///// Move construct from error
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////*******************************************
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//expected(TError&& error)
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// : data(etl::move(error))
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//{
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//}
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//*******************************************
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/// Copy assign
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//*******************************************
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expected& operator =(const expected& other)
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{
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data = other.data;
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return *this;
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}
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//*******************************************
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/// Move assign
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//*******************************************
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expected& operator =(expected&& other)
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{
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data = etl::move(other.data);
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return *this;
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}
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//*******************************************
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/// Copy assign from value
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//*******************************************
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expected& operator =(const TValue& value)
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{
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data = value;
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return *this;
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}
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//*******************************************
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/// Move assign from value
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//*******************************************
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expected& operator =(TValue&& value)
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{
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data = etl::move(value);
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return *this;
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}
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//*******************************************
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/// Copy assign from error
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//*******************************************
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expected& operator =(const TError& error)
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{
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data = error;
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return *this;
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}
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//*******************************************
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/// Move assign from error
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//*******************************************
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expected& operator =(TError&& error)
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{
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data = etl::move(error);
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return *this;
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}
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//*******************************************
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/// Returns a const reference to the value.
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/// Undefined if the expected does not contain an value.
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//*******************************************
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ETL_CONSTEXPR14 const TValue& value() const
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{
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return etl::get<TValue>(data);
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}
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//*******************************************
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/// Returns an rvalue reference to the value.
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/// Undefined if the expected does not contain an value.
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//*******************************************
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ETL_CONSTEXPR14 TValue&& value()
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{
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return etl::move(etl::get<TValue>(etl::move(data)));
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}
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#if ETL_CPP11_SUPPORTED
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//*******************************************
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///
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//*******************************************
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template <typename U>
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ETL_CONSTEXPR14 TValue value_or(U&& default_value) const&
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{
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if (has_value())
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{
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return value();
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}
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else
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{
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return default_value;
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}
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}
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//*******************************************
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///
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//*******************************************
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template <typename U>
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ETL_CONSTEXPR14 TValue value_or(U&& default_value) &&
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{
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if (has_value())
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{
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return etl::move(value());
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}
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else
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{
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return etl::move(default_value);
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}
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}
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#else
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//*******************************************
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///
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//*******************************************
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template <typename U>
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TValue value_or(const U& default_value) const
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{
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if (has_value())
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{
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return value();
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}
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else
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{
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return default_value;
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}
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}
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#endif
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//*******************************************
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/// Returns a const reference to the error.
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/// Undefined if the expected does not contain an error.
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//*******************************************
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ETL_CONSTEXPR14 const TError& error() const
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{
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return etl::get<TError>(data);
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}
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#if (ETL_CPP11_SUPPORTED)
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//*******************************************
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/// Returns an rvalue reference to the error.
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/// Undefined if the expected does not contain an error.
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//*******************************************
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ETL_CONSTEXPR14 TError&& error() &&
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{
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return etl::move(etl::get<TError>(data));
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}
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//*******************************************
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/// Returns an rvalue reference to the error.
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/// Undefined if the expected does not contain an error.
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//*******************************************
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ETL_CONSTEXPR14 TError&& error() const &&
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{
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return etl::move(etl::get<TError>(data));
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}
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#endif
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private:
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etl::variant<TValue, TError> data;
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};
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//*****************************************************************************
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/// Result type.
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/// Specialisation for void value type.
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//*****************************************************************************
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template<typename TError>
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class expected<void, TError>
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{
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}
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#endif
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