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fixed old implementation (issue #57)

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This commit is contained in:
Andrzej Krzemienski
2018-07-12 00:30:47 +02:00
parent d0b87d2f35
commit 228b20df82
3 changed files with 339 additions and 111 deletions
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226
include/boost/optional/optional.hpp
View File

@ -60,19 +60,34 @@
#include <boost/optional/detail/optional_factory_support.hpp>
#include <boost/optional/detail/optional_aligned_storage.hpp>
namespace boost { namespace optional_detail {
template <typename T>
struct optional_value_type
{
};
template <typename T>
struct optional_value_type< ::boost::optional<T> >
{
typedef T type;
};
}} // namespace boost::optional_detail
#ifdef BOOST_OPTIONAL_CONFIG_USE_OLD_IMPLEMENTATION_OF_OPTIONAL
#include <boost/optional/detail/old_optional_implementation.hpp>
#else
namespace boost {
namespace optional_ns {
// a tag for in-place initialization of contained value
struct in_place_init_t
{
struct init_tag{};
explicit in_place_init_t(init_tag){}
};
};
const in_place_init_t in_place_init ((in_place_init_t::init_tag()));
// a tag for conditional in-place initialization of contained value
@ -82,7 +97,7 @@ struct in_place_init_if_t
explicit in_place_init_if_t(init_tag){}
};
const in_place_init_if_t in_place_init_if ((in_place_init_if_t::init_tag()));
} // namespace optional_ns
using optional_ns::in_place_init_t;
@ -252,7 +267,7 @@ class optional_base : public optional_tag
construct(rhs.get_impl());
}
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Assigns from another optional<T> (deep-moves the rhs value)
void assign ( optional_base&& rhs )
@ -269,7 +284,7 @@ class optional_base : public optional_tag
construct(boost::move(rhs.get_impl()));
}
}
#endif
#endif
// Assigns from another _convertible_ optional<U> (deep-copies the rhs value)
template<class U>
@ -283,7 +298,7 @@ class optional_base : public optional_tag
#else
assign_value( static_cast<value_type>(rhs.get()) );
#endif
else destroy();
}
else
@ -316,7 +331,7 @@ class optional_base : public optional_tag
}
}
#endif
// Assigns from a T (deep-copies the rhs value)
void assign ( argument_type val )
{
@ -324,7 +339,7 @@ class optional_base : public optional_tag
assign_value(val);
else construct(val);
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Assigns from a T (deep-moves the rhs value)
void assign ( rval_reference_type val )
@ -385,7 +400,7 @@ class optional_base : public optional_tag
::new (m_storage.address()) value_type(val) ;
m_initialized = true ;
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
void construct ( rval_reference_type val )
{
@ -411,7 +426,7 @@ class optional_base : public optional_tag
destroy();
construct(in_place_init, boost::forward<Args>(args)...);
}
template<class... Args>
explicit optional_base ( in_place_init_t, Args&&... args )
:
@ -419,7 +434,7 @@ class optional_base : public optional_tag
{
construct(in_place_init, boost::forward<Args>(args)...);
}
template<class... Args>
explicit optional_base ( in_place_init_if_t, bool cond, Args&&... args )
:
@ -435,26 +450,26 @@ class optional_base : public optional_tag
::new (m_storage.address()) value_type( boost::forward<Arg>(arg) );
m_initialized = true ;
}
void construct ( in_place_init_t )
{
::new (m_storage.address()) value_type();
m_initialized = true ;
}
template<class Arg>
void emplace_assign ( Arg&& arg )
{
destroy();
construct(in_place_init, boost::forward<Arg>(arg)) ;
}
void emplace_assign ()
{
destroy();
construct(in_place_init) ;
}
template<class Arg>
explicit optional_base ( in_place_init_t, Arg&& arg )
:
@ -462,14 +477,14 @@ class optional_base : public optional_tag
{
construct(in_place_init, boost::forward<Arg>(arg));
}
explicit optional_base ( in_place_init_t )
:
m_initialized(false)
{
construct(in_place_init);
}
template<class Arg>
explicit optional_base ( in_place_init_if_t, bool cond, Arg&& arg )
:
@ -478,7 +493,7 @@ class optional_base : public optional_tag
if ( cond )
construct(in_place_init, boost::forward<Arg>(arg));
}
explicit optional_base ( in_place_init_if_t, bool cond )
:
m_initialized(false)
@ -488,21 +503,21 @@ class optional_base : public optional_tag
}
#else
template<class Arg>
void construct ( in_place_init_t, const Arg& arg )
{
::new (m_storage.address()) value_type( arg );
m_initialized = true ;
}
template<class Arg>
void construct ( in_place_init_t, Arg& arg )
{
::new (m_storage.address()) value_type( arg );
m_initialized = true ;
}
void construct ( in_place_init_t )
{
::new (m_storage.address()) value_type();
@ -515,20 +530,20 @@ class optional_base : public optional_tag
destroy();
construct(in_place_init, arg);
}
template<class Arg>
void emplace_assign ( Arg& arg )
{
destroy();
construct(in_place_init, arg);
}
void emplace_assign ()
{
destroy();
construct(in_place_init);
}
template<class Arg>
explicit optional_base ( in_place_init_t, const Arg& arg )
: m_initialized(false)
@ -542,13 +557,13 @@ class optional_base : public optional_tag
{
construct(in_place_init, arg);
}
explicit optional_base ( in_place_init_t )
: m_initialized(false)
{
construct(in_place_init);
}
template<class Arg>
explicit optional_base ( in_place_init_if_t, bool cond, const Arg& arg )
: m_initialized(false)
@ -556,15 +571,15 @@ class optional_base : public optional_tag
if ( cond )
construct(in_place_init, arg);
}
template<class Arg>
explicit optional_base ( in_place_init_if_t, bool cond, Arg& arg )
: m_initialized(false)
{
if ( cond )
construct(in_place_init, arg);
}
}
explicit optional_base ( in_place_init_if_t, bool cond )
: m_initialized(false)
{
@ -758,17 +773,6 @@ class optional_base : public optional_tag
storage_type m_storage ;
} ;
template <typename T>
struct optional_value_type
{
};
template <typename T>
struct optional_value_type< ::boost::optional<T> >
{
typedef T type;
};
#include <boost/optional/detail/optional_trivially_copyable_base.hpp>
// definition of metafunciton is_optional_val_init_candidate
@ -782,7 +786,7 @@ struct is_optional_related
{};
#if !defined(BOOST_OPTIONAL_DETAIL_NO_IS_CONSTRUCTIBLE_TRAIT)
template <typename T, typename U>
struct is_convertible_to_T_or_factory
: boost::conditional< boost::is_base_of<boost::in_place_factory_base, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
@ -871,7 +875,7 @@ class optional
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Creates an optional<T> initialized with 'move(val)'.
// Can throw if T::T(T &&) does
optional ( rval_reference_type val ) : base( boost::forward<T>(val) )
optional ( rval_reference_type val ) : base( boost::forward<T>(val) )
{}
#endif
@ -882,7 +886,7 @@ class optional
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
/// Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialized optional.
// Can throw if T::T(T &&) does
optional ( bool cond, rval_reference_type val ) : base( cond, boost::forward<T>(val) )
optional ( bool cond, rval_reference_type val ) : base( cond, boost::forward<T>(val) )
{}
#endif
@ -899,11 +903,11 @@ class optional
)
:
base()
{
{
if ( rhs.is_initialized() )
this->construct(rhs.get());
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Creates a deep move of another convertible optional<U>
// Requires a valid conversion from U to T.
@ -936,10 +940,10 @@ class optional
template<class Expr>
explicit optional ( Expr&& expr,
BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_val_init_candidate<T, Expr>, bool>::type = true
)
: base(boost::forward<Expr>(expr),boost::addressof(expr))
explicit optional ( Expr&& expr,
BOOST_DEDUCED_TYPENAME boost::enable_if< optional_detail::is_optional_val_init_candidate<T, Expr>, bool>::type = true
)
: base(boost::forward<Expr>(expr),boost::addressof(expr))
{}
#else
@ -983,7 +987,7 @@ class optional
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template<class Expr>
BOOST_DEDUCED_TYPENAME boost::enable_if<optional_detail::is_optional_val_init_candidate<T, Expr>, optional&>::type
BOOST_DEDUCED_TYPENAME boost::enable_if<optional_detail::is_optional_val_init_candidate<T, Expr>, optional&>::type
operator= ( Expr&& expr )
{
this->assign_expr(boost::forward<Expr>(expr),boost::addressof(expr));
@ -1009,7 +1013,7 @@ class optional
this->assign(rhs);
return *this ;
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Move-assigns from another convertible optional<U> (converts && deep-moves the rhs value)
// Requires a valid conversion from U to T.
@ -1040,14 +1044,14 @@ class optional
#ifndef BOOST_OPTIONAL_DETAIL_NO_DEFAULTED_MOVE_FUNCTIONS
optional& operator= ( optional && ) = default;
#else
optional& operator= ( optional && rhs )
optional& operator= ( optional && rhs )
BOOST_NOEXCEPT_IF(::boost::is_nothrow_move_constructible<T>::value && ::boost::is_nothrow_move_assignable<T>::value)
{
this->assign( static_cast<base &&>(rhs) ) ;
return *this ;
}
#endif
#endif
#endif // BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
#ifndef BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
@ -1060,7 +1064,7 @@ class optional
this->assign( boost::forward<T_>(val) ) ;
return *this ;
}
#else
// Assigns from a T (deep-copies the rhs value)
@ -1070,7 +1074,7 @@ class optional
this->assign( val ) ;
return *this ;
}
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
// Assigns from a T (deep-moves the rhs value)
optional& operator= ( rval_reference_type val )
@ -1079,9 +1083,9 @@ class optional
return *this ;
}
#endif
#endif // BOOST_NO_CXX11_UNIFIED_INITIALIZATION_SYNTAX
// Assigns from a "none"
// Which destroys the current value, if any, leaving this UNINITIALIZED
// No-throw (assuming T::~T() doesn't)
@ -1090,7 +1094,7 @@ class optional
this->assign( none_ ) ;
return *this ;
}
#if (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES) && (!defined BOOST_NO_CXX11_VARIADIC_TEMPLATES)
// Constructs in-place
// upon exception *this is always uninitialized
@ -1099,29 +1103,29 @@ class optional
{
this->emplace_assign( boost::forward<Args>(args)... );
}
template<class... Args>
explicit optional ( in_place_init_t, Args&&... args )
: base( in_place_init, boost::forward<Args>(args)... )
{}
template<class... Args>
explicit optional ( in_place_init_if_t, bool cond, Args&&... args )
: base( in_place_init_if, cond, boost::forward<Args>(args)... )
{}
#elif (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
template<class Arg>
void emplace ( Arg&& arg )
{
this->emplace_assign( boost::forward<Arg>(arg) );
}
void emplace ()
{
this->emplace_assign();
}
template<class Args>
explicit optional ( in_place_init_t, Args&& args )
: base( in_place_init, boost::forward<Args>(args) )
@ -1130,12 +1134,12 @@ class optional
explicit optional ( in_place_init_t )
: base( in_place_init )
{}
template<class Args>
explicit optional ( in_place_init_if_t, bool cond, Args&& args )
: base( in_place_init_if, cond, boost::forward<Args>(args) )
{}
explicit optional ( in_place_init_if_t, bool cond )
: base( in_place_init_if, cond )
{}
@ -1145,23 +1149,23 @@ class optional
{
this->emplace_assign( arg );
}
template<class Arg>
void emplace ( Arg& arg )
{
this->emplace_assign( arg );
}
void emplace ()
{
this->emplace_assign();
}
template<class Arg>
explicit optional ( in_place_init_t, const Arg& arg )
: base( in_place_init, arg )
{}
template<class Arg>
explicit optional ( in_place_init_t, Arg& arg )
: base( in_place_init, arg )
@ -1170,17 +1174,17 @@ class optional
explicit optional ( in_place_init_t )
: base( in_place_init )
{}
template<class Arg>
explicit optional ( in_place_init_if_t, bool cond, const Arg& arg )
: base( in_place_init_if, cond, arg )
{}
template<class Arg>
explicit optional ( in_place_init_if_t, bool cond, Arg& arg )
: base( in_place_init_if, cond, arg )
{}
{}
explicit optional ( in_place_init_if_t, bool cond )
: base( in_place_init_if, cond )
{}
@ -1213,7 +1217,7 @@ class optional
// Returns a reference to the value if this is initialized, otherwise,
// the behaviour is UNDEFINED
// No-throw
#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)
reference_const_type operator *() const& { return this->get() ; }
reference_type operator *() & { return this->get() ; }
reference_type_of_temporary_wrapper operator *() && { return boost::move(this->get()) ; }
@ -1222,42 +1226,42 @@ class optional
reference_type operator *() { return this->get() ; }
#endif // !defined BOOST_NO_CXX11_REF_QUALIFIERS
#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)
reference_const_type value() const&
{
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access());
}
reference_type value() &
{
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access());
}
reference_type_of_temporary_wrapper value() &&
{
{
if (this->is_initialized())
return boost::move(this->get()) ;
else
throw_exception(bad_optional_access());
}
#else
#else
reference_const_type value() const
{
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access());
}
reference_type value()
{
{
if (this->is_initialized())
return this->get() ;
else
@ -1269,16 +1273,16 @@ class optional
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
template <class U>
value_type value_or ( U&& v ) const&
{
{
if (this->is_initialized())
return get();
else
return boost::forward<U>(v);
}
template <class U>
value_type value_or ( U&& v ) &&
{
value_type value_or ( U&& v ) &&
{
if (this->is_initialized())
return boost::move(get());
else
@ -1286,7 +1290,7 @@ class optional
}
#elif !defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template <class U>
value_type value_or ( U&& v ) const
value_type value_or ( U&& v ) const
{
if (this->is_initialized())
return get();
@ -1295,17 +1299,17 @@ class optional
}
#else
template <class U>
value_type value_or ( U const& v ) const
{
value_type value_or ( U const& v ) const
{
if (this->is_initialized())
return get();
else
return v;
}
template <class U>
value_type value_or ( U& v ) const
{
value_type value_or ( U& v ) const
{
if (this->is_initialized())
return get();
else
@ -1314,7 +1318,7 @@ class optional
#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>
value_type value_or_eval ( F f ) const&
{
@ -1323,7 +1327,7 @@ class optional
else
return f();
}
template <typename F>
value_type value_or_eval ( F f ) &&
{
@ -1350,7 +1354,7 @@ class optional
else
return none;
}
template <typename F>
optional<typename boost::result_of<F(reference_type_of_temporary_wrapper)>::type> map(F f) &&
{
@ -1359,7 +1363,7 @@ class optional
else
return none;
}
template <typename F>
optional<typename optional_detail::optional_value_type<typename boost::result_of<F(reference_type)>::type>::type> flat_map(F f) &
{
@ -1368,7 +1372,7 @@ class optional
else
return none;
}
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&
{
@ -1377,7 +1381,7 @@ class optional
else
return none;
}
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) &&
{
@ -1386,7 +1390,7 @@ class optional
else
return none;
}
#else
template <typename F>
value_type value_or_eval ( F f ) const
@ -1423,7 +1427,7 @@ class optional
else
return none;
}
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
{
@ -1432,13 +1436,13 @@ class optional
else
return none;
}
#endif
bool has_value() const BOOST_NOEXCEPT { return this->is_initialized() ; }
bool operator!() const BOOST_NOEXCEPT { return !this->is_initialized() ; }
BOOST_EXPLICIT_OPERATOR_BOOL_NOEXCEPT()
} ;
@ -1447,7 +1451,7 @@ class optional
#endif // BOOST_OPTIONAL_CONFIG_USE_OLD_IMPLEMENTATION_OF_OPTIONAL
namespace boost {
#ifndef BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
template<class T>
class optional<T&&>
@ -1576,14 +1580,14 @@ get_pointer ( optional<T>& opt )
} // namespace boost
namespace boost {
// The following declaration prevents a bug where operator safe-bool is used upon streaming optional object if you forget the IO header.
template<class CharType, class CharTrait>
std::basic_ostream<CharType, CharTrait>&
operator<<(std::basic_ostream<CharType, CharTrait>& os, optional_detail::optional_tag const&)
{
BOOST_STATIC_ASSERT_MSG(sizeof(CharType) == 0, "If you want to output boost::optional, include header <boost/optional/optional_io.hpp>");
return os;
return os;
}
} // namespace boost

1
test/Jamfile.v2
View File

@ -40,6 +40,7 @@ import testing ;
[ run optional_test_io.cpp ]
[ run optional_test_move.cpp ]
[ run optional_test_noexcept_move.cpp ]
[ run optional_test_old_impl.cpp ]
[ run optional_test_equals_none.cpp ]
[ run optional_test_value_access.cpp ]
[ run optional_test_emplace.cpp ]

223
test/optional_test_old_impl.cpp Normal file
View File

@ -0,0 +1,223 @@
// Copyright (C) 2014 - 2018 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)
//
// See http://www.boost.org/lib/optional for documentation.
//
// You are welcome to contact the author at:
// akrzemi1@gmail.com
#define BOOST_OPTIONAL_CONFIG_USE_OLD_IMPLEMENTATION_OF_OPTIONAL // does old implementation still work for basic usage?
#include "boost/optional/optional.hpp"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#include "boost/core/ignore_unused.hpp"
#include "boost/core/lightweight_test.hpp"
using boost::optional;
struct IntWrapper
{
int _i;
IntWrapper(int i) : _i(i) {}
bool operator==(IntWrapper const& rhs) const { return _i == rhs._i; }
};
template <typename T>
void test_function_value_or_for()
{
optional<T> oM0;
const optional<T> oC0;
optional<T> oM1(1);
const optional<T> oC2(2);
BOOST_TEST(oM0.value_or(5) == 5);
BOOST_TEST(oC0.value_or(5) == 5);
BOOST_TEST(oM1.value_or(5) == 1);
BOOST_TEST(oC2.value_or(5) == 2);
}
template <typename T>
void test_function_value_for()
{
optional<T> o0;
optional<T> o1(1);
const optional<T> oC(2);
try
{
T& v = o1.value();
BOOST_TEST(v == 1);
}
catch(...)
{
BOOST_TEST(false);
}
try
{
T const& v = oC.value();
BOOST_TEST(v == 2);
}
catch(...)
{
BOOST_TEST(false);
}
BOOST_TEST_THROWS(o0.value(), boost::bad_optional_access);
}
void test_function_value()
{
test_function_value_for<int>();
test_function_value_for<double>();
test_function_value_for<IntWrapper>();
}
struct FatToIntConverter
{
static int conversions;
int _val;
FatToIntConverter(int val) : _val(val) {}
operator int() const { conversions += 1; return _val; }
};
int FatToIntConverter::conversions = 0;
void test_function_value_or()
{
test_function_value_or_for<int>();
test_function_value_or_for<double>();
test_function_value_or_for<IntWrapper>();
optional<int> oi(1);
BOOST_TEST(oi.value_or(FatToIntConverter(2)) == 1);
BOOST_TEST(FatToIntConverter::conversions == 0);
oi = boost::none;
BOOST_TEST(oi.value_or(FatToIntConverter(2)) == 2);
BOOST_TEST(FatToIntConverter::conversions == 1);
}
struct FunM
{
int operator()() { return 5; }
};
struct FunC
{
int operator()() const { return 6; }
};
int funP ()
{
return 7;
}
int throw_()
{
throw int();
}
void test_function_value_or_eval()
{
optional<int> o1 = 1;
optional<int> oN;
FunM funM;
FunC funC;
BOOST_TEST_EQ(o1.value_or_eval(funM), 1);
BOOST_TEST_EQ(oN.value_or_eval(funM), 5);
BOOST_TEST_EQ(o1.value_or_eval(FunM()), 1);
BOOST_TEST_EQ(oN.value_or_eval(FunM()), 5);
BOOST_TEST_EQ(o1.value_or_eval(funC), 1);
BOOST_TEST_EQ(oN.value_or_eval(funC), 6);
BOOST_TEST_EQ(o1.value_or_eval(FunC()), 1);
BOOST_TEST_EQ(oN.value_or_eval(FunC()), 6);
BOOST_TEST_EQ(o1.value_or_eval(funP), 1);
BOOST_TEST_EQ(oN.value_or_eval(funP), 7);
#ifndef BOOST_NO_CXX11_LAMBDAS
BOOST_TEST_EQ(o1.value_or_eval([](){return 8;}), 1);
BOOST_TEST_EQ(oN.value_or_eval([](){return 8;}), 8);
#endif
try
{
BOOST_TEST_EQ(o1.value_or_eval(throw_), 1);
}
catch(...)
{
BOOST_TEST(false);
}
BOOST_TEST_THROWS(oN.value_or_eval(throw_), int);
}
const optional<std::string> makeConstOptVal()
{
return std::string("something");
}
void test_const_move()
{
std::string s5 = *makeConstOptVal();
std::string s6 = makeConstOptVal().value();
boost::ignore_unused(s5);
boost::ignore_unused(s6);
}
#if (!defined BOOST_NO_CXX11_REF_QUALIFIERS) && (!defined BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES)
struct MoveOnly
{
explicit MoveOnly(int){}
MoveOnly(MoveOnly &&){}
void operator=(MoveOnly &&);
private:
MoveOnly(MoveOnly const&);
void operator=(MoveOnly const&);
};
optional<MoveOnly> makeMoveOnly()
{
return MoveOnly(1);
}
MoveOnly moveOnlyDefault()
{
return MoveOnly(1);
}
// compile-time test
void test_move_only_getters()
{
MoveOnly m1 = *makeMoveOnly();
MoveOnly m2 = makeMoveOnly().value();
MoveOnly m3 = makeMoveOnly().value_or(MoveOnly(1));
MoveOnly m4 = makeMoveOnly().value_or_eval(moveOnlyDefault);
boost::ignore_unused(m1);
boost::ignore_unused(m2);
boost::ignore_unused(m3);
boost::ignore_unused(m4);
}
#endif // !defined BOOST_NO_CXX11_REF_QUALIFIERS
int main()
{
test_function_value();
test_function_value_or();
test_function_value_or_eval();
test_const_move();
return boost::report_errors();
}