diff options
author | mrsmidge <smidge@xsco.net> | 2019-08-15 22:37:50 +0100 |
---|---|---|
committer | mrsmidge <smidge@xsco.net> | 2019-08-15 22:37:50 +0100 |
commit | 6c30925688bbe8b448304c3a819b1c62da6edf9d (patch) | |
tree | f8ab371bee5048413e1cda0785260e9e7ee7e305 | |
parent | ee7d0f0d144d8204020cbe51323b0c7741b76060 (diff) |
Remove Boost from public API, C++11 compatible
25 files changed, 1432 insertions, 295 deletions
diff --git a/include/djinterop/crate.hpp b/include/djinterop/crate.hpp index 261888b..de0df74 100644 --- a/include/djinterop/crate.hpp +++ b/include/djinterop/crate.hpp @@ -27,8 +27,7 @@ #include <string> #include <vector> -#include <boost/optional.hpp> -#include <boost/utility/string_view.hpp> +#include <djinterop/optional/optional.hpp> namespace djinterop { @@ -96,8 +95,8 @@ public: /// Returns the parent crate, if this crate has one /// - /// If the crate doesn't have a parent, then an `boost::none` is returned. - boost::optional<crate> parent() const; + /// If the crate doesn't have a parent, then `nullopt_t` is returned. + std::experimental::optional<crate> parent() const; /// Removes a track from the crate /// @@ -106,13 +105,13 @@ public: void remove_track(track tr) const; /// Sets the crate's name - void set_name(boost::string_view name) const; + void set_name(std::string name) const; /// Sets this crate's parent /// - /// If an empty `boost::optional` is given, then this crate will have no - /// parent. That is, it becomes a root crate. - void set_parent(boost::optional<crate> parent) const; + /// If `nullopt_t` is given, then this crate will have no parent. That is, + /// it becomes a root crate. + void set_parent(std::experimental::optional<crate> parent) const; /// Returns the crate's contained tracks std::vector<track> tracks() const; diff --git a/include/djinterop/database.hpp b/include/djinterop/database.hpp index ed98237..ea2d8ec 100644 --- a/include/djinterop/database.hpp +++ b/include/djinterop/database.hpp @@ -26,8 +26,7 @@ #include <memory> #include <vector> -#include <boost/optional.hpp> -#include <boost/utility/string_view.hpp> +#include <djinterop/optional/optional.hpp> namespace sqlite { @@ -67,26 +66,26 @@ public: /// Returns the crate with the given ID /// - /// If no such crate exists in the database, then boost::none is returned. - boost::optional<crate> crate_by_id(int64_t id) const; + /// If no such crate exists in the database, then `nullopt` is returned. + std::experimental::optional<crate> crate_by_id(int64_t id) const; /// Returns all crates contained in the database std::vector<crate> crates() const; /// Returns all crates with the given name - std::vector<crate> crates_by_name(boost::string_view name) const; + std::vector<crate> crates_by_name(const std::string& name) const; /// Creates a new crate with the given name /// /// The created crate has no parent. - crate create_crate(boost::string_view name) const; + crate create_crate(std::string name) const; /// Creates a new track associated to a given music file /// /// The music file is given by its relative path from the directory passed /// to the `database` constructor. The created track is not contained in any /// crates. - track create_track(boost::string_view relative_path) const; + track create_track(std::string relative_path) const; /// Returns the path directory of the database /// @@ -126,13 +125,13 @@ public: /// Returns the track with the given id /// - /// If no such track exists in the database, then boost::none is returned. - boost::optional<track> track_by_id(int64_t id) const; + /// If no such track exists in the database, then `nullopt` is returned. + std::experimental::optional<track> track_by_id(int64_t id) const; /// Returns all tracks whose `relative_path` attribute in the database /// matches the given string std::vector<track> tracks_by_relative_path( - boost::string_view relative_path) const; + const std::string& relative_path) const; /// Returns all tracks contained in the database std::vector<track> tracks() const; diff --git a/include/djinterop/optional/LICENSE_1_0.txt b/include/djinterop/optional/LICENSE_1_0.txt new file mode 100644 index 0000000..36b7cd9 --- /dev/null +++ b/include/djinterop/optional/LICENSE_1_0.txt @@ -0,0 +1,23 @@ +Boost Software License - Version 1.0 - August 17th, 2003 + +Permission is hereby granted, free of charge, to any person or organization +obtaining a copy of the software and accompanying documentation covered by +this license (the "Software") to use, reproduce, display, distribute, +execute, and transmit the Software, and to prepare derivative works of the +Software, and to permit third-parties to whom the Software is furnished to +do so, all subject to the following: + +The copyright notices in the Software and this entire statement, including +the above license grant, this restriction and the following disclaimer, +must be included in all copies of the Software, in whole or in part, and +all derivative works of the Software, unless such copies or derivative +works are solely in the form of machine-executable object code generated by +a source language processor. + +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, TITLE AND NON-INFRINGEMENT. IN NO EVENT +SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE +FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, +ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +DEALINGS IN THE SOFTWARE. diff --git a/include/djinterop/optional/optional.hpp b/include/djinterop/optional/optional.hpp new file mode 100644 index 0000000..8db9317 --- /dev/null +++ b/include/djinterop/optional/optional.hpp @@ -0,0 +1,1066 @@ +// Copyright (C) 2011 - 2012 Andrzej Krzemienski. +// +// Use, modification, and distribution is subject to the Boost Software +// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at +// http://www.boost.org/LICENSE_1_0.txt) +// +// The idea and interface is based on Boost.Optional library +// authored by Fernando Luis Cacciola Carballal + +# ifndef ___OPTIONAL_HPP___ +# define ___OPTIONAL_HPP___ + +# include <utility> +# include <type_traits> +# include <initializer_list> +# include <cassert> +# include <functional> +# include <string> +# include <stdexcept> + +# define TR2_OPTIONAL_REQUIRES(...) typename enable_if<__VA_ARGS__::value, bool>::type = false + +# if defined __GNUC__ // NOTE: GNUC is also defined for Clang +# if (__GNUC__ == 4) && (__GNUC_MINOR__ >= 8) +# define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___ +# elif (__GNUC__ > 4) +# define TR2_OPTIONAL_GCC_4_8_AND_HIGHER___ +# endif +# +# if (__GNUC__ == 4) && (__GNUC_MINOR__ >= 7) +# define TR2_OPTIONAL_GCC_4_7_AND_HIGHER___ +# elif (__GNUC__ > 4) +# define TR2_OPTIONAL_GCC_4_7_AND_HIGHER___ +# endif +# +# if (__GNUC__ == 4) && (__GNUC_MINOR__ == 8) && (__GNUC_PATCHLEVEL__ >= 1) +# define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ +# elif (__GNUC__ == 4) && (__GNUC_MINOR__ >= 9) +# define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ +# elif (__GNUC__ > 4) +# define TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ +# endif +# endif +# +# if defined __clang_major__ +# if (__clang_major__ == 3 && __clang_minor__ >= 5) +# define TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ +# elif (__clang_major__ > 3) +# define TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ +# endif +# if defined TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ +# define TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_ +# elif (__clang_major__ == 3 && __clang_minor__ == 4 && __clang_patchlevel__ >= 2) +# define TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_ +# endif +# endif +# +# if defined _MSC_VER +# if (_MSC_VER >= 1900) +# define TR2_OPTIONAL_MSVC_2015_AND_HIGHER___ +# endif +# endif + +# if defined __clang__ +# if (__clang_major__ > 2) || (__clang_major__ == 2) && (__clang_minor__ >= 9) +# define OPTIONAL_HAS_THIS_RVALUE_REFS 1 +# else +# define OPTIONAL_HAS_THIS_RVALUE_REFS 0 +# endif +# elif defined TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ +# define OPTIONAL_HAS_THIS_RVALUE_REFS 1 +# elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___ +# define OPTIONAL_HAS_THIS_RVALUE_REFS 1 +# else +# define OPTIONAL_HAS_THIS_RVALUE_REFS 0 +# endif + + +# if defined TR2_OPTIONAL_GCC_4_8_1_AND_HIGHER___ +# define OPTIONAL_HAS_CONSTEXPR_INIT_LIST 1 +# define OPTIONAL_CONSTEXPR_INIT_LIST constexpr +# else +# define OPTIONAL_HAS_CONSTEXPR_INIT_LIST 0 +# define OPTIONAL_CONSTEXPR_INIT_LIST +# endif + +# if defined TR2_OPTIONAL_CLANG_3_5_AND_HIGHTER_ && (defined __cplusplus) && (__cplusplus != 201103L) +# define OPTIONAL_HAS_MOVE_ACCESSORS 1 +# else +# define OPTIONAL_HAS_MOVE_ACCESSORS 0 +# endif + +# // In C++11 constexpr implies const, so we need to make non-const members also non-constexpr +# if (defined __cplusplus) && (__cplusplus == 201103L) +# define OPTIONAL_MUTABLE_CONSTEXPR +# else +# define OPTIONAL_MUTABLE_CONSTEXPR constexpr +# endif + +namespace std{ + +namespace experimental{ + +// BEGIN workaround for missing is_trivially_destructible +# if defined TR2_OPTIONAL_GCC_4_8_AND_HIGHER___ + // leave it: it is already there +# elif defined TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_ + // leave it: it is already there +# elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___ + // leave it: it is already there +# elif defined TR2_OPTIONAL_DISABLE_EMULATION_OF_TYPE_TRAITS + // leave it: the user doesn't want it +# else + template <typename T> + using is_trivially_destructible = std::has_trivial_destructor<T>; +# endif +// END workaround for missing is_trivially_destructible + +# if (defined TR2_OPTIONAL_GCC_4_7_AND_HIGHER___) + // leave it; our metafunctions are already defined. +# elif defined TR2_OPTIONAL_CLANG_3_4_2_AND_HIGHER_ + // leave it; our metafunctions are already defined. +# elif defined TR2_OPTIONAL_MSVC_2015_AND_HIGHER___ + // leave it: it is already there +# elif defined TR2_OPTIONAL_DISABLE_EMULATION_OF_TYPE_TRAITS + // leave it: the user doesn't want it +# else + + +// workaround for missing traits in GCC and CLANG +template <class T> +struct is_nothrow_move_constructible +{ + constexpr static bool value = std::is_nothrow_constructible<T, T&&>::value; +}; + + +template <class T, class U> +struct is_assignable +{ + template <class X, class Y> + constexpr static bool has_assign(...) { return false; } + + template <class X, class Y, size_t S = sizeof((std::declval<X>() = std::declval<Y>(), true)) > + // the comma operator is necessary for the cases where operator= returns void + constexpr static bool has_assign(bool) { return true; } + + constexpr static bool value = has_assign<T, U>(true); +}; + + +template <class T> +struct is_nothrow_move_assignable +{ + template <class X, bool has_any_move_assign> + struct has_nothrow_move_assign { + constexpr static bool value = false; + }; + + template <class X> + struct has_nothrow_move_assign<X, true> { + constexpr static bool value = noexcept( std::declval<X&>() = std::declval<X&&>() ); + }; + + constexpr static bool value = has_nothrow_move_assign<T, is_assignable<T&, T&&>::value>::value; +}; +// end workaround + + +# endif + + + +// 20.5.4, optional for object types +template <class T> class optional; + +// 20.5.5, optional for lvalue reference types +template <class T> class optional<T&>; + + +// workaround: std utility functions aren't constexpr yet +template <class T> inline constexpr T&& constexpr_forward(typename std::remove_reference<T>::type& t) noexcept +{ + return static_cast<T&&>(t); +} + +template <class T> inline constexpr T&& constexpr_forward(typename std::remove_reference<T>::type&& t) noexcept +{ + static_assert(!std::is_lvalue_reference<T>::value, "!!"); + return static_cast<T&&>(t); +} + +template <class T> inline constexpr typename std::remove_reference<T>::type&& constexpr_move(T&& t) noexcept +{ + return static_cast<typename std::remove_reference<T>::type&&>(t); +} + + +#if defined NDEBUG +# define TR2_OPTIONAL_ASSERTED_EXPRESSION(CHECK, EXPR) (EXPR) +#else +# define TR2_OPTIONAL_ASSERTED_EXPRESSION(CHECK, EXPR) ((CHECK) ? (EXPR) : ([]{assert(!#CHECK);}(), (EXPR))) +#endif + + +namespace detail_ +{ + +// static_addressof: a constexpr version of addressof +template <typename T> +struct has_overloaded_addressof +{ + template <class X> + constexpr static bool has_overload(...) { return false; } + + template <class X, size_t S = sizeof(std::declval<X&>().operator&()) > + constexpr static bool has_overload(bool) { return true; } + + constexpr static bool value = has_overload<T>(true); +}; + +template <typename T, TR2_OPTIONAL_REQUIRES(!has_overloaded_addressof<T>)> +constexpr T* static_addressof(T& ref) +{ + return &ref; +} + +template <typename T, TR2_OPTIONAL_REQUIRES(has_overloaded_addressof<T>)> +T* static_addressof(T& ref) +{ + return std::addressof(ref); +} + + +// the call to convert<A>(b) has return type A and converts b to type A iff b decltype(b) is implicitly convertible to A +template <class U> +constexpr U convert(U v) { return v; } + + +namespace swap_ns +{ + using std::swap; + + template <class T> + void adl_swap(T& t, T& u) noexcept(noexcept(swap(t, u))) + { + swap(t, u); + } + +} // namespace swap_ns + +} // namespace detail + + +constexpr struct trivial_init_t{} trivial_init{}; + + +// 20.5.6, In-place construction +constexpr struct in_place_t{} in_place{}; + + +// 20.5.7, Disengaged state indicator +struct nullopt_t +{ + struct init{}; + constexpr explicit nullopt_t(init){} +}; +constexpr nullopt_t nullopt{nullopt_t::init()}; + + +// 20.5.8, class bad_optional_access +class bad_optional_access : public logic_error { +public: + explicit bad_optional_access(const string& what_arg) : logic_error{what_arg} {} + explicit bad_optional_access(const char* what_arg) : logic_error{what_arg} {} +}; + + +template <class T> +union storage_t +{ + unsigned char dummy_; + T value_; + + constexpr storage_t( trivial_init_t ) noexcept : dummy_() {}; + + template <class... Args> + constexpr storage_t( Args&&... args ) : value_(constexpr_forward<Args>(args)...) {} + + ~storage_t(){} +}; + + +template <class T> +union constexpr_storage_t +{ + unsigned char dummy_; + T value_; + + constexpr constexpr_storage_t( trivial_init_t ) noexcept : dummy_() {}; + + template <class... Args> + constexpr constexpr_storage_t( Args&&... args ) : value_(constexpr_forward<Args>(args)...) {} + + ~constexpr_storage_t() = default; +}; + + +template <class T> +struct optional_base +{ + bool init_; + storage_t<T> storage_; + + constexpr optional_base() noexcept : init_(false), storage_(trivial_init) {}; + + explicit constexpr optional_base(const T& v) : init_(true), storage_(v) {} + + explicit constexpr optional_base(T&& v) : init_(true), storage_(constexpr_move(v)) {} + + template <class... Args> explicit optional_base(in_place_t, Args&&... args) + : init_(true), storage_(constexpr_forward<Args>(args)...) {} + + template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)> + explicit optional_base(in_place_t, std::initializer_list<U> il, Args&&... args) + : init_(true), storage_(il, std::forward<Args>(args)...) {} + + ~optional_base() { if (init_) storage_.value_.T::~T(); } +}; + + +template <class T> +struct constexpr_optional_base +{ + bool init_; + constexpr_storage_t<T> storage_; + + constexpr constexpr_optional_base() noexcept : init_(false), storage_(trivial_init) {}; + + explicit constexpr constexpr_optional_base(const T& v) : init_(true), storage_(v) {} + + explicit constexpr constexpr_optional_base(T&& v) : init_(true), storage_(constexpr_move(v)) {} + + template <class... Args> explicit constexpr constexpr_optional_base(in_place_t, Args&&... args) + : init_(true), storage_(constexpr_forward<Args>(args)...) {} + + template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)> + OPTIONAL_CONSTEXPR_INIT_LIST explicit constexpr_optional_base(in_place_t, std::initializer_list<U> il, Args&&... args) + : init_(true), storage_(il, std::forward<Args>(args)...) {} + + ~constexpr_optional_base() = default; +}; + +template <class T> +using OptionalBase = typename std::conditional< + is_trivially_destructible<T>::value, // if possible + constexpr_optional_base<typename std::remove_const<T>::type>, // use base with trivial destructor + optional_base<typename std::remove_const<T>::type> +>::type; + + + +template <class T> +class optional : private OptionalBase<T> +{ + static_assert( !std::is_same<typename std::decay<T>::type, nullopt_t>::value, "bad T" ); + static_assert( !std::is_same<typename std::decay<T>::type, in_place_t>::value, "bad T" ); + + + constexpr bool initialized() const noexcept { return OptionalBase<T>::init_; } + typename std::remove_const<T>::type* dataptr() { return std::addressof(OptionalBase<T>::storage_.value_); } + constexpr const T* dataptr() const { return detail_::static_addressof(OptionalBase<T>::storage_.value_); } + +# if OPTIONAL_HAS_THIS_RVALUE_REFS == 1 + constexpr const T& contained_val() const& { return OptionalBase<T>::storage_.value_; } +# if OPTIONAL_HAS_MOVE_ACCESSORS == 1 + OPTIONAL_MUTABLE_CONSTEXPR T&& contained_val() && { return std::move(OptionalBase<T>::storage_.value_); } + OPTIONAL_MUTABLE_CONSTEXPR T& contained_val() & { return OptionalBase<T>::storage_.value_; } +# else + T& contained_val() & { return OptionalBase<T>::storage_.value_; } + T&& contained_val() && { return std::move(OptionalBase<T>::storage_.value_); } +# endif +# else + constexpr const T& contained_val() const { return OptionalBase<T>::storage_.value_; } + T& contained_val() { return OptionalBase<T>::storage_.value_; } +# endif + + void clear() noexcept { + if (initialized()) dataptr()->T::~T(); + OptionalBase<T>::init_ = false; + } + + template <class... Args> + void initialize(Args&&... args) noexcept(noexcept(T(std::forward<Args>(args)...))) + { + assert(!OptionalBase<T>::init_); + ::new (static_cast<void*>(dataptr())) T(std::forward<Args>(args)...); + OptionalBase<T>::init_ = true; + } + + template <class U, class... Args> + void initialize(std::initializer_list<U> il, Args&&... args) noexcept(noexcept(T(il, std::forward<Args>(args)...))) + { + assert(!OptionalBase<T>::init_); + ::new (static_cast<void*>(dataptr())) T(il, std::forward<Args>(args)...); + OptionalBase<T>::init_ = true; + } + +public: + typedef T value_type; + + // 20.5.5.1, constructors + constexpr optional() noexcept : OptionalBase<T>() {}; + constexpr optional(nullopt_t) noexcept : OptionalBase<T>() {}; + + optional(const optional& rhs) + : OptionalBase<T>() + { + if (rhs.initialized()) { + ::new (static_cast<void*>(dataptr())) T(*rhs); + OptionalBase<T>::init_ = true; + } + } + + optional(optional&& rhs) noexcept(is_nothrow_move_constructible<T>::value) + : OptionalBase<T>() + { + if (rhs.initialized()) { + ::new (static_cast<void*>(dataptr())) T(std::move(*rhs)); + OptionalBase<T>::init_ = true; + } + } + + constexpr optional(const T& v) : OptionalBase<T>(v) {} + + constexpr optional(T&& v) : OptionalBase<T>(constexpr_move(v)) {} + + template <class... Args> + explicit constexpr optional(in_place_t, Args&&... args) + : OptionalBase<T>(in_place_t{}, constexpr_forward<Args>(args)...) {} + + template <class U, class... Args, TR2_OPTIONAL_REQUIRES(is_constructible<T, std::initializer_list<U>>)> + OPTIONAL_CONSTEXPR_INIT_LIST explicit optional(in_place_t, std::initializer_list<U> il, Args&&... args) + : OptionalBase<T>(in_place_t{}, il, constexpr_forward<Args>(args)...) {} + + // 20.5.4.2, Destructor + ~optional() = default; + + // 20.5.4.3, assignment + optional& operator=(nullopt_t) noexcept + { + clear(); + return *this; + } + + optional& operator=(const optional& rhs) + { + if (initialized() == true && rhs.initialized() == false) clear(); + else if (initialized() == false && rhs.initialized() == true) initialize(*rhs); + else if (initialized() == true && rhs.initialized() == true) contained_val() = *rhs; + return *this; + } + + optional& operator=(optional&& rhs) + noexcept(is_nothrow_move_assignable<T>::value && is_nothrow_move_constructible<T>::value) + { + if (initialized() == true && rhs.initialized() == false) clear(); + else if (initialized() == false && rhs.initialized() == true) initialize(std::move(*rhs)); + else if (initialized() == true && rhs.initialized() == true) contained_val() = std::move(*rhs); + return *this; + } + + template <class U> + auto operator=(U&& v) + -> typename enable_if + < + is_same<typename decay<U>::type, T>::value, + optional& + >::type + { + if (initialized()) { contained_val() = std::forward<U>(v); } + else { initialize(std::forward<U>(v)); } + return *this; + } + + + template <class... Args> + void emplace(Args&&... args) + { + clear(); + initialize(std::forward<Args>(args)...); + } + + template <class U, class... Args> + void emplace(initializer_list<U> il, Args&&... args) + { + clear(); + initialize<U, Args...>(il, std::forward<Args>(args)...); + } + + // 20.5.4.4, Swap + void swap(optional<T>& rhs) noexcept(is_nothrow_move_constructible<T>::value + && noexcept(detail_::swap_ns::adl_swap(declval<T&>(), declval<T&>()))) + { + if (initialized() == true && rhs.initialized() == false) { rhs.initialize(std::move(**this)); clear(); } + else if (initialized() == false && rhs.initialized() == true) { initialize(std::move(*rhs)); rhs.clear(); } + else if (initialized() == true && rhs.initialized() == true) { using std::swap; swap(**this, *rhs); } + } + + // 20.5.4.5, Observers + + explicit constexpr operator bool() const noexcept { return initialized(); } + constexpr bool has_value() const noexcept { return initialized(); } + + constexpr T const* operator ->() const { + return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), dataptr()); + } + +# if OPTIONAL_HAS_MOVE_ACCESSORS == 1 + + OPTIONAL_MUTABLE_CONSTEXPR T* operator ->() { + assert (initialized()); + return dataptr(); + } + + constexpr T const& operator *() const& { + return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), contained_val()); + } + + OPTIONAL_MUTABLE_CONSTEXPR T& operator *() & { + assert (initialized()); + return contained_val(); + } + + OPTIONAL_MUTABLE_CONSTEXPR T&& operator *() && { + assert (initialized()); + return constexpr_move(contained_val()); + } + + constexpr T const& value() const& { + return initialized() ? contained_val() : (throw bad_optional_access("bad optional access"), contained_val()); + } + + OPTIONAL_MUTABLE_CONSTEXPR T& value() & { + return initialized() ? contained_val() : (throw bad_optional_access("bad optional access"), contained_val()); + } + + OPTIONAL_MUTABLE_CONSTEXPR T&& value() && { + if (!initialized()) throw bad_optional_access("bad optional access"); + return std::move(contained_val()); + } + +# else + + T* operator ->() { + assert (initialized()); + return dataptr(); + } + + constexpr T const& operator *() const { + return TR2_OPTIONAL_ASSERTED_EXPRESSION(initialized(), contained_val()); + } + + T& operator *() { + assert (initialized()); + return contained_val(); + } + + constexpr T const& value() const { + return initialized() ? contained_val() : (throw bad_optional_access("bad optional access"), contained_val()); + } + + T& value() { + return initialized() ? contained_val() : (throw bad_optional_access("bad optional access"), contained_val()); + } + +# endif + +# if OPTIONAL_HAS_THIS_RVALUE_REFS == 1 + + template <class V> + constexpr T value_or(V&& v) const& + { + return *this ? **this : detail_::convert<T>(constexpr_forward<V>(v)); + } + +# if OPTIONAL_HAS_MOVE_ACCESSORS == 1 + + template <class V> + OPTIONAL_MUTABLE_CONSTEXPR T value_or(V&& v) && + { + return *this ? constexpr_move(const_cast<optional<T>&>(*this).contained_val()) : detail_::convert<T>(constexpr_forward<V>(v)); + } + +# else + + template <class V> + T value_or(V&& v) && + { + return *this ? constexpr_move(const_cast<optional<T>&>(*this).contained_val()) : detail_::convert<T>(constexpr_forward<V>(v)); + } + +# endif + +# else + + template <class V> + constexpr T value_or(V&& v) const + { + return *this ? **this : detail_::convert<T>(constexpr_forward<V>(v)); + } + +# endif + + // 20.6.3.6, modifiers + void reset() noexcept { clear(); } +}; + + +template <class T> +class optional<T&> +{ + static_assert( !std::is_same<T, nullopt_t>::value, "bad T" ); + static_assert( !std::is_same<T, in_place_t>::value, "bad T" ); + T* ref; + +public: + + // 20.5.5.1, construction/destruction + constexpr optional() noexcept : ref(nullptr) {} + + constexpr optional(nullopt_t) noexcept : ref(nullptr) {} + + constexpr optional(T& v) noexcept : ref(detail_::static_addressof(v)) {} + + optional(T&&) = delete; + + constexpr optional(const optional& rhs) noexcept : ref(rhs.ref) {} + + explicit constexpr optional(in_place_t, T& v) noexcept : ref(detail_::static_addressof(v)) {} + + explicit optional(in_place_t, T&&) = delete; + + ~optional() = default; + + // 20.5.5.2, mutation + optional& operator=(nullopt_t) noexcept { + ref = nullptr; + return *this; + } + + // optional& operator=(const optional& rhs) noexcept { + // ref = rhs.ref; + // return *this; + // } + + // optional& operator=(optional&& rhs) noexcept { + // ref = rhs.ref; + // return *this; + // } + + template <typename U> + auto operator=(U&& rhs) noexcept + -> typename enable_if + < + is_same<typename decay<U>::type, optional<T&>>::value, + optional& + >::type + { + ref = rhs.ref; + return *this; + } + + template <typename U> + auto operator=(U&& rhs) noexcept + -> typename enable_if + < + !is_same<typename decay<U>::type, optional<T&>>::value, + optional& + >::type + = delete; + + void emplace(T& v) noexcept { + ref = detail_::static_addressof(v); + } + + void emplace(T&&) = delete; + + + void swap(optional<T&>& rhs) noexcept + { + std::swap(ref, rhs.ref); + } + + // 20.5.5.3, observers + constexpr T* operator->() const { + return TR2_OPTIONAL_ASSERTED_EXPRESSION(ref, ref); + } + + constexpr T& operator*() const { + return TR2_OPTIONAL_ASSERTED_EXPRESSION(ref, *ref); + } + + constexpr T& value() const { + return ref ? *ref : (throw bad_optional_access("bad optional access"), *ref); + } + + explicit constexpr operator bool() const noexcept { + return ref != nullptr; + } + + constexpr bool has_value() const noexcept { + return ref != nullptr; + } + + template <class V> + constexpr typename decay<T>::type value_or(V&& v) const + { + return *this ? **this : detail_::convert<typename decay<T>::type>(constexpr_forward<V>(v)); + } + + // x.x.x.x, modifiers + void reset() noexcept { ref = nullptr; } +}; + + +template <class T> +class optional<T&&> +{ |