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Drop support for C++03

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Andrzej Krzemienski
2024-08-15 01:48:31 +02:00
parent 8421c07517
commit 82d08adf11
5 changed files with 71 additions and 65 deletions
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5
doc/91_relnotes.qbk
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@ -11,6 +11,11 @@
[section:relnotes Release Notes] [section:relnotes Release Notes]
[heading Boost Release 1.87]
* *Breaking change.* Dropped support for C++03. C++11 is now the required minimum.
[heading Boost Release 1.85] [heading Boost Release 1.85]
* Fixed the implementation for trivial types. Now it is slower, because it always initializes the `T`, but it avoids undefined behavior when `optional<T>` is copied. This fixes [@https://github.com/boostorg/optional/issues/108 issue #108]. * Fixed the implementation for trivial types. Now it is slower, because it always initializes the `T`, but it avoids undefined behavior when `optional<T>` is copied. This fixes [@https://github.com/boostorg/optional/issues/108 issue #108].

5
include/boost/none_t.hpp
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@ -1,5 +1,5 @@
// Copyright (C) 2003, Fernando Luis Cacciola Carballal. // Copyright (C) 2003, Fernando Luis Cacciola Carballal.
// Copyright (C) 2014, 2015 Andrzej Krzemienski. // Copyright (C) 2014, 2024 Andrzej Krzemienski.
// //
// Use, modification, and distribution is subject to the Boost Software // Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -14,12 +14,11 @@
#define BOOST_NONE_T_17SEP2003_HPP #define BOOST_NONE_T_17SEP2003_HPP
#include <boost/config.hpp> #include <boost/config.hpp>
#include <boost/config/pragma_message.hpp>
#if defined (BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_NO_CXX11_REF_QUALIFIERS) \ #if defined (BOOST_NO_CXX11_RVALUE_REFERENCES) || defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) || defined(BOOST_NO_CXX11_REF_QUALIFIERS) \
|| defined(BOOST_NO_CXX11_LAMBDAS) || defined(BOOST_NO_CXX11_DECLTYPE_N3276) || defined(BOOST_NO_CXX11_NOEXCEPT) || defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) || defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || defined(BOOST_NO_CXX11_DEFAULTED_MOVES) || defined(BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS) || defined(BOOST_NO_CXX11_LAMBDAS) || defined(BOOST_NO_CXX11_DECLTYPE_N3276) || defined(BOOST_NO_CXX11_NOEXCEPT) || defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) || defined(BOOST_NO_CXX11_DEFAULTED_FUNCTIONS) || defined(BOOST_NO_CXX11_DEFAULTED_MOVES) || defined(BOOST_NO_CXX11_EXPLICIT_CONVERSION_OPERATORS)
BOOST_PRAGMA_MESSAGE("C++03 support is deprecated in Boost.Optional 1.83 and will be removed in Boost.Optional 1.86.") #error "Boost.Optional requires C++11 or later. If you have an older C++ version use Boost.Optional version 1.86 or earlier."
#endif #endif

83
include/boost/optional/detail/optional_reference_spec.hpp
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@ -1,4 +1,4 @@
// Copyright (C) 2015-2018 Andrzej Krzemienski. // Copyright (C) 2015-2024 Andrzej Krzemienski.
// //
// Use, modification, and distribution is subject to the Boost Software // Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
@ -29,15 +29,15 @@ template <class From>
void prevent_binding_rvalue() void prevent_binding_rvalue()
{ {
#ifndef BOOST_OPTIONAL_CONFIG_ALLOW_BINDING_TO_RVALUES #ifndef BOOST_OPTIONAL_CONFIG_ALLOW_BINDING_TO_RVALUES
BOOST_STATIC_ASSERT_MSG(boost::is_lvalue_reference<From>::value, BOOST_STATIC_ASSERT_MSG(boost::is_lvalue_reference<From>::value,
"binding rvalue references to optional lvalue references is disallowed"); "binding rvalue references to optional lvalue references is disallowed");
#endif #endif
} }
template <class T> template <class T>
BOOST_DEDUCED_TYPENAME boost::remove_reference<T>::type& forward_reference(T&& r) BOOST_DEDUCED_TYPENAME boost::remove_reference<T>::type& forward_reference(T&& r)
{ {
BOOST_STATIC_ASSERT_MSG(boost::is_lvalue_reference<T>::value, BOOST_STATIC_ASSERT_MSG(boost::is_lvalue_reference<T>::value,
"binding rvalue references to optional lvalue references is disallowed"); "binding rvalue references to optional lvalue references is disallowed");
return boost::forward<T>(r); return boost::forward<T>(r);
} }
@ -68,10 +68,10 @@ void prevent_assignment_from_false_const_integral()
#ifdef BOOST_OPTIONAL_CONFIG_NO_PROPER_ASSIGN_FROM_CONST_INT #ifdef BOOST_OPTIONAL_CONFIG_NO_PROPER_ASSIGN_FROM_CONST_INT
// MSVC compiler without rvalue references: we need to disable the assignment from // MSVC compiler without rvalue references: we need to disable the assignment from
// const integral lvalue reference, as it may be an invalid temporary // const integral lvalue reference, as it may be an invalid temporary
BOOST_STATIC_ASSERT_MSG(!is_const_integral<From>::value, BOOST_STATIC_ASSERT_MSG(!is_const_integral<From>::value,
"binding const lvalue references to integral types is disabled in this compiler"); "binding const lvalue references to integral types is disabled in this compiler");
#endif #endif
#endif #endif
} }
@ -114,7 +114,7 @@ template <class T>
class optional<T&> : public optional_detail::optional_tag class optional<T&> : public optional_detail::optional_tag
{ {
T* ptr_; T* ptr_;
public: public:
typedef T& value_type; typedef T& value_type;
typedef T& reference_type; typedef T& reference_type;
@ -122,19 +122,19 @@ public:
typedef T& rval_reference_type; typedef T& rval_reference_type;
typedef T* pointer_type; typedef T* pointer_type;
typedef T* pointer_const_type; typedef T* pointer_const_type;
optional() BOOST_NOEXCEPT : ptr_() {} optional() BOOST_NOEXCEPT : ptr_() {}
optional(none_t) BOOST_NOEXCEPT : ptr_() {} optional(none_t) BOOST_NOEXCEPT : ptr_() {}
template <class U> template <class U>
explicit optional(const optional<U&>& rhs) BOOST_NOEXCEPT : ptr_(rhs.get_ptr()) {} explicit optional(const optional<U&>& rhs) BOOST_NOEXCEPT : ptr_(rhs.get_ptr()) {}
optional(const optional& rhs) BOOST_NOEXCEPT : ptr_(rhs.get_ptr()) {} optional(const optional& rhs) BOOST_NOEXCEPT : ptr_(rhs.get_ptr()) {}
// the following two implement a 'conditionally explicit' constructor: condition is a hack for buggy compilers with screwed conversion construction from const int // the following two implement a 'conditionally explicit' constructor: condition is a hack for buggy compilers with screwed conversion construction from const int
template <class U> template <class U>
explicit optional(U& rhs, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::is_same_decayed<T, U>::value && detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT explicit optional(U& rhs, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::is_same_decayed<T, U>::value && detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT
: ptr_(boost::addressof(rhs)) {} : ptr_(boost::addressof(rhs)) {}
template <class U> template <class U>
optional(U& rhs, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::is_same_decayed<T, U>::value && !detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT optional(U& rhs, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::is_same_decayed<T, U>::value && !detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT
: ptr_(boost::addressof(rhs)) {} : ptr_(boost::addressof(rhs)) {}
@ -143,15 +143,15 @@ public:
template <class U> template <class U>
optional& operator=(const optional<U&>& rhs) BOOST_NOEXCEPT { ptr_ = rhs.get_ptr(); return *this; } optional& operator=(const optional<U&>& rhs) BOOST_NOEXCEPT { ptr_ = rhs.get_ptr(); return *this; }
optional& operator=(none_t) BOOST_NOEXCEPT { ptr_ = 0; return *this; } optional& operator=(none_t) BOOST_NOEXCEPT { ptr_ = 0; return *this; }
void swap(optional& rhs) BOOST_NOEXCEPT { std::swap(ptr_, rhs.ptr_); } void swap(optional& rhs) BOOST_NOEXCEPT { std::swap(ptr_, rhs.ptr_); }
T& get() const { BOOST_ASSERT(ptr_); return *ptr_; } T& get() const { BOOST_ASSERT(ptr_); return *ptr_; }
T* get_ptr() const BOOST_NOEXCEPT { return ptr_; } T* get_ptr() const BOOST_NOEXCEPT { return ptr_; }
T* operator->() const { BOOST_ASSERT(ptr_); return ptr_; } T* operator->() const { BOOST_ASSERT(ptr_); return ptr_; }
T& operator*() const { BOOST_ASSERT(ptr_); return *ptr_; } T& operator*() const { BOOST_ASSERT(ptr_); return *ptr_; }
T& value() const T& value() const
{ {
if (this->is_initialized()) if (this->is_initialized())
@ -159,17 +159,17 @@ public:
else else
throw_exception(bad_optional_access()); throw_exception(bad_optional_access());
} }
bool operator!() const BOOST_NOEXCEPT { return ptr_ == 0; } bool operator!() const BOOST_NOEXCEPT { return ptr_ == 0; }
BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT() BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
void reset() BOOST_NOEXCEPT { ptr_ = 0; } void reset() BOOST_NOEXCEPT { ptr_ = 0; }
bool is_initialized() const BOOST_NOEXCEPT { return ptr_ != 0; } bool is_initialized() const BOOST_NOEXCEPT { return ptr_ != 0; }
bool has_value() const BOOST_NOEXCEPT { return ptr_ != 0; } bool has_value() const BOOST_NOEXCEPT { return ptr_ != 0; }
template <typename F> template <typename F>
optional<typename boost::result_of<F(T&)>::type> map(F f) const auto map(F f) const -> optional<decltype(f(**this))>
{ {
if (this->has_value()) if (this->has_value())
return f(this->get()); return f(this->get());
@ -178,61 +178,62 @@ public:
} }
template <typename F> template <typename F>
optional<typename optional_detail::optional_value_type<typename boost::result_of<F(T&)>::type>::type> flat_map(F f) const auto flat_map(F f) const ->
optional<typename optional_detail::optional_value_type<decltype(f(**this))>::type>
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
else else
return none; return none;
} }
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES #ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
optional(T&& /* rhs */) BOOST_NOEXCEPT { detail::prevent_binding_rvalue<T&&>(); } optional(T&& /* rhs */) BOOST_NOEXCEPT { detail::prevent_binding_rvalue<T&&>(); }
template <class R> template <class R>
optional(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::no_unboxing_cond<T, R>, bool>::type = true) BOOST_NOEXCEPT optional(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::no_unboxing_cond<T, R>, bool>::type = true) BOOST_NOEXCEPT
: ptr_(boost::addressof(r)) { detail::prevent_binding_rvalue<R>(); } : ptr_(boost::addressof(r)) { detail::prevent_binding_rvalue<R>(); }
template <class R> template <class R>
optional(bool cond, R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT optional(bool cond, R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT
: ptr_(cond ? boost::addressof(r) : 0) { detail::prevent_binding_rvalue<R>(); } : ptr_(cond ? boost::addressof(r) : 0) { detail::prevent_binding_rvalue<R>(); }
template <class R> template <class R>
BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, optional<T&>&>::type BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, optional<T&>&>::type
operator=(R&& r) BOOST_NOEXCEPT { detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); return *this; } operator=(R&& r) BOOST_NOEXCEPT { detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); return *this; }
template <class R> template <class R>
void emplace(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT void emplace(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT
{ detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); } { detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); }
template <class R> template <class R>
T& get_value_or(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) const BOOST_NOEXCEPT T& get_value_or(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) const BOOST_NOEXCEPT
{ detail::prevent_binding_rvalue<R>(); return ptr_ ? *ptr_ : r; } { detail::prevent_binding_rvalue<R>(); return ptr_ ? *ptr_ : r; }
template <class R> template <class R>
T& value_or(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) const BOOST_NOEXCEPT T& value_or(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) const BOOST_NOEXCEPT
{ detail::prevent_binding_rvalue<R>(); return ptr_ ? *ptr_ : r; } { detail::prevent_binding_rvalue<R>(); return ptr_ ? *ptr_ : r; }
template <class R> template <class R>
void reset(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT void reset(R&& r, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<R>, bool>::type = true) BOOST_NOEXCEPT
{ detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); } { detail::prevent_binding_rvalue<R>(); ptr_ = boost::addressof(r); }
template <class F> template <class F>
T& value_or_eval(F f) const { return ptr_ ? *ptr_ : detail::forward_reference(f()); } T& value_or_eval(F f) const { return ptr_ ? *ptr_ : detail::forward_reference(f()); }
#else // BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES #else // BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// the following two implement a 'conditionally explicit' constructor // the following two implement a 'conditionally explicit' constructor
template <class U> template <class U>
explicit optional(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::no_unboxing_cond<T, U>::value && detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT explicit optional(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::no_unboxing_cond<T, U>::value && detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT
: ptr_(boost::addressof(v)) { } : ptr_(boost::addressof(v)) { }
template <class U> template <class U>
optional(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::no_unboxing_cond<T, U>::value && !detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT optional(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if_c<detail::no_unboxing_cond<T, U>::value && !detail::is_const_integral_bad_for_conversion<U>::value, bool>::type = true) BOOST_NOEXCEPT
: ptr_(boost::addressof(v)) { } : ptr_(boost::addressof(v)) { }
template <class U> template <class U>
optional(bool cond, U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT : ptr_(cond ? boost::addressof(v) : 0) {} optional(bool cond, U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT : ptr_(cond ? boost::addressof(v) : 0) {}
@ -247,26 +248,26 @@ public:
template <class U> template <class U>
void emplace(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT void emplace(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT
{ ptr_ = boost::addressof(v); } { ptr_ = boost::addressof(v); }
template <class U> template <class U>
T& get_value_or(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) const BOOST_NOEXCEPT T& get_value_or(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) const BOOST_NOEXCEPT
{ return ptr_ ? *ptr_ : v; } { return ptr_ ? *ptr_ : v; }
template <class U> template <class U>
T& value_or(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) const BOOST_NOEXCEPT T& value_or(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) const BOOST_NOEXCEPT
{ return ptr_ ? *ptr_ : v; } { return ptr_ ? *ptr_ : v; }
template <class U> template <class U>
void reset(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT void reset(U& v, BOOST_DEDUCED_TYPENAME boost::enable_if<detail::is_no_optional<U>, bool>::type = true) BOOST_NOEXCEPT
{ ptr_ = boost::addressof(v); } { ptr_ = boost::addressof(v); }
template <class F> template <class F>
T& value_or_eval(F f) const { return ptr_ ? *ptr_ : f(); } T& value_or_eval(F f) const { return ptr_ ? *ptr_ : f(); }
#endif // BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES #endif // BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
}; };
template <class T> template <class T>
void swap ( optional<T&>& x, optional<T&>& y) BOOST_NOEXCEPT void swap ( optional<T&>& x, optional<T&>& y) BOOST_NOEXCEPT
{ {
x.swap(y); x.swap(y);

35
include/boost/optional/optional.hpp
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@ -60,7 +60,6 @@
#include <boost/move/utility.hpp> #include <boost/move/utility.hpp>
#include <boost/none.hpp> #include <boost/none.hpp>
#include <boost/utility/compare_pointees.hpp> #include <boost/utility/compare_pointees.hpp>
#include <boost/utility/result_of.hpp>
#include <boost/optional/optional_fwd.hpp> #include <boost/optional/optional_fwd.hpp>
#include <boost/optional/detail/optional_config.hpp> #include <boost/optional/detail/optional_config.hpp>
@ -75,12 +74,15 @@ struct optional_value_type
{ {
}; };
template <typename T> template <typename U>
struct optional_value_type< ::boost::optional<T> > struct optional_value_type< ::boost::optional<U> >
{ {
typedef T type; typedef U type;
}; };
template <typename T>
T declval();
}} // namespace boost::optional_detail }} // namespace boost::optional_detail
namespace boost { namespace boost {
@ -1381,7 +1383,6 @@ class optional
} }
#endif #endif
#if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES) #if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
template <typename F> template <typename F>
value_type value_or_eval ( F f ) const& value_type value_or_eval ( F f ) const&
@ -1402,7 +1403,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename boost::result_of<F(reference_type)>::type> map(F f) & optional<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_type>()))> map(F f) &
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
@ -1411,7 +1412,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename boost::result_of<F(reference_const_type)>::type> map(F f) const& optional<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_const_type>()))> map(F f) const&
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
@ -1420,7 +1421,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename boost::result_of<F(reference_type_of_temporary_wrapper)>::type> map(F f) && optional<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_type_of_temporary_wrapper>()))> map(F f) &&
{ {
if (this->has_value()) if (this->has_value())
return f(boost::move(this->get())); return f(boost::move(this->get()));
@ -1429,7 +1430,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_type)>::type>::type> flat_map(F f) & optional<typename optional_detail::optional_value_type<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_type>()))>::type> flat_map(F f) &
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
@ -1438,7 +1439,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_const_type)>::type>::type> flat_map(F f) const& optional<typename optional_detail::optional_value_type<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_const_type>()))>::type>flat_map(F f) const&
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
@ -1447,7 +1448,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_type_of_temporary_wrapper)>::type>::type> flat_map(F f) && optional<typename optional_detail::optional_value_type<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_type_of_temporary_wrapper>()))>::type>flat_map(F f) &&
{ {
if (this->has_value()) if (this->has_value())
return f(boost::move(get())); return f(boost::move(get()));
@ -1466,7 +1467,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename boost::result_of<F(reference_type)>::type> map(F f) optional<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_type>()))> map(F f)
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
@ -1475,7 +1476,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename boost::result_of<F(reference_const_type)>::type> map(F f) const optional<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_const_type>()))> map(F f) const
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
@ -1484,7 +1485,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_type)>::type>::type> flat_map(F f) optional<typename optional_detail::optional_value_type<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_type>()))>::type> flat_map(F f)
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
@ -1493,7 +1494,7 @@ class optional
} }
template <typename F> template <typename F>
optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_const_type)>::type>::type> flat_map(F f) const optional<typename optional_detail::optional_value_type<decltype(optional_detail::declval<F>()(optional_detail::declval<reference_const_type>()))>::type> flat_map(F f) const
{ {
if (this->has_value()) if (this->has_value())
return f(get()); return f(get());
@ -1505,9 +1506,7 @@ class optional
bool has_value() const BOOST_NOEXCEPT { return this->is_initialized() ; } bool has_value() const BOOST_NOEXCEPT { return this->is_initialized() ; }
bool operator!() const BOOST_NOEXCEPT { return !this->is_initialized() ; } explicit operator bool() const BOOST_NOEXCEPT { return this->has_value() ; }
BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
} ; } ;

8
test/optional_test_msvc_bug_workaround.cpp
View File

@ -29,13 +29,15 @@ void test()
{ {
#if (!defined BOOST_NO_CXX11_RVALUE_REFERENCES) #if (!defined BOOST_NO_CXX11_RVALUE_REFERENCES)
boost::optional<int> v = Wrapper(); boost::optional<int> v = Wrapper();
BOOST_TEST(v); //BOOST_TEST(v);
boost::optional<boost::optional<int>> vv;
bool xx = vv?true : false;
BOOST_TEST_EQ(*v, 7); BOOST_TEST_EQ(*v, 7);
#endif #endif
} }
int main() int main()
{ {
test(); test();
return boost::report_errors(); return boost::report_errors();
} }