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Added 'raw' move semantics; no unit-tests

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This commit is contained in:
Andrzej Krzemienski
2014-04-14 23:44:34 +02:00
parent b4738ac07e
commit 587ef8e988
1 changed files with 128 additions and 9 deletions
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127
include/boost/optional/optional.hpp
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@ -131,6 +131,9 @@ struct types_when_isnt_ref
{
typedef T const& reference_const_type ;
typedef T & reference_type ;
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
typedef T && rval_reference_type ;
#endif
typedef T const* pointer_const_type ;
typedef T * pointer_type ;
typedef T const& argument_type ;
@ -142,6 +145,9 @@ struct types_when_is_ref
typedef raw_type& reference_const_type ;
typedef raw_type& reference_type ;
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
typedef raw_type&& rval_reference_type ;
#endif
typedef raw_type* pointer_const_type ;
typedef raw_type* pointer_type ;
typedef raw_type& argument_type ;
@ -184,6 +190,9 @@ class optional_base : public optional_tag
typedef BOOST_DEDUCED_TYPENAME types::reference_type reference_type ;
typedef BOOST_DEDUCED_TYPENAME types::reference_const_type reference_const_type ;
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
typedef BOOST_DEDUCED_TYPENAME types::rval_reference_type rval_reference_type ;
#endif
typedef BOOST_DEDUCED_TYPENAME types::pointer_type pointer_type ;
typedef BOOST_DEDUCED_TYPENAME types::pointer_const_type pointer_const_type ;
typedef BOOST_DEDUCED_TYPENAME types::argument_type argument_type ;
@ -209,6 +218,17 @@ class optional_base : public optional_tag
construct(val);
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// move-construct an optional<T> initialized from an rvalue-ref to 'val'.
// Can throw if T::T(T&&) does
optional_base ( rval_reference_type val )
:
m_initialized(false)
{
construct( static_cast<T&&>(val) );
}
#endif
// Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialzed optional<T>.
// Can throw if T::T(T const&) does
optional_base ( bool cond, argument_type val )
@ -229,6 +249,17 @@ class optional_base : public optional_tag
construct(rhs.get_impl());
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// Creates a deep move of another optional<T>
// Can throw if T::T(T&&) does
optional_base ( optional_base&& rhs )
:
m_initialized(false)
{
if ( rhs.is_initialized() )
construct( static_cast<T&&>(rhs.get_impl()) );
}
#endif
// This is used for both converting and in-place constructions.
// Derived classes use the 'tag' to select the appropriate
@ -279,6 +310,26 @@ class optional_base : public optional_tag
}
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// move-assigns from another _convertible_ optional<U> (deep-moves from the rhs value)
template<class U>
void assign ( optional<U>&& rhs )
{
typedef BOOST_DEDUCED_TYPENAME optional<U>::rval_reference_type ref_type;
if (is_initialized())
{
if ( rhs.is_initialized() )
assign_value(static_cast<ref_type>(rhs.get()), is_reference_predicate() );
else destroy();
}
else
{
if ( rhs.is_initialized() )
construct(static_cast<ref_type>(rhs.get()));
}
}
#endif
// Assigns from a T (deep-copies the rhs value)
void assign ( argument_type val )
{
@ -287,6 +338,16 @@ class optional_base : public optional_tag
else construct(val);
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// Assigns from a T (deep-moves the rhs value)
void assign ( rval_reference_type val )
{
if (is_initialized())
assign_value( static_cast<rval_reference_type>(val), is_reference_predicate() );
else construct( static_cast<rval_reference_type>(val) );
}
#endif
// Assigns from "none", destroying the current value, if any, leaving this UNINITIALIZED
// No-throw (assuming T::~T() doesn't)
void assign ( none_t ) { destroy(); }
@ -326,6 +387,14 @@ class optional_base : public optional_tag
m_initialized = true ;
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
void construct ( rval_reference_type val )
{
new (m_storage.address()) internal_type( static_cast<rval_reference_type>(val) ) ;
m_initialized = true ;
}
#endif
#ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
// Constructs in-place using the given factory
template<class Expr>
@ -411,6 +480,10 @@ class optional_base : public optional_tag
void assign_value ( argument_type val, is_not_reference_tag ) { get_impl() = val; }
void assign_value ( argument_type val, is_reference_tag ) { construct(val); }
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
void assign_value ( rval_reference_type val, is_not_reference_tag ) { get_impl() = static_cast<rval_reference_type>(val); }
void assign_value ( rval_reference_type val, is_reference_tag ) { construct( static_cast<rval_reference_type>(val) ); }
#endif
void destroy()
{
@ -488,22 +561,34 @@ class optional : public optional_detail::optional_base<T>
typedef BOOST_DEDUCED_TYPENAME base::value_type value_type ;
typedef BOOST_DEDUCED_TYPENAME base::reference_type reference_type ;
typedef BOOST_DEDUCED_TYPENAME base::reference_const_type reference_const_type ;
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
typedef BOOST_DEDUCED_TYPENAME base::rval_reference_type rval_reference_type ;
#endif
typedef BOOST_DEDUCED_TYPENAME base::pointer_type pointer_type ;
typedef BOOST_DEDUCED_TYPENAME base::pointer_const_type pointer_const_type ;
typedef BOOST_DEDUCED_TYPENAME base::argument_type argument_type ;
// Creates an optional<T> uninitialized.
// No-throw
optional() : base() {}
optional() BOOST_NOEXCEPT : base() {}
// Creates an optional<T> uninitialized.
// No-throw
optional( none_t none_ ) : base(none_) {}
optional( none_t none_ ) BOOST_NOEXCEPT : base(none_) {}
// Creates an optional<T> initialized with 'val'.
// Can throw if T::T(T const&) does
optional ( argument_type val ) : base(val) {}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// Creates an optional<T> initialized with 'move(val)'.
// Can throw if T::T(T &&) does
optional ( rval_reference_type val ) BOOST_NOEXCEPT_IF(BOOST_NOEXCEPT_EXPR(T(static_cast<T&&>(val))))
:
base( static_cast<T&&>(val) )
{}
#endif
// Creates an optional<T> initialized with 'val' IFF cond is true, otherwise creates an uninitialized optional.
// Can throw if T::T(T const&) does
optional ( bool cond, argument_type val ) : base(cond,val) {}
@ -522,6 +607,20 @@ class optional : public optional_detail::optional_base<T>
this->construct(rhs.get());
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// Creates a deep move of another convertible optional<U>
// Requires a valid conversion from U to T.
// Can throw if T::T(U&&) does
template<class U>
explicit optional ( optional<U> && rhs )
:
base()
{
if ( rhs.is_initialized() )
this->construct( static_cast<BOOST_DEDUCED_TYPENAME optional<U>::rval_reference_type>(rhs.get()) );
}
#endif
#ifndef BOOST_OPTIONAL_NO_INPLACE_FACTORY_SUPPORT
// Creates an optional<T> with an expression which can be either
// (a) An instance of InPlaceFactory (i.e. in_place(a,b,...,n);
@ -573,6 +672,16 @@ class optional : public optional_detail::optional_base<T>
return *this ;
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// Assigns from another optional<T> (deep-moves the rhs value)
optional& operator= ( optional && rhs )
BOOST_NOEXCEPT_IF(BOOST_NOEXCEPT_EXPR(T(static_cast<optional &&>(*rhs))) && BOOST_NOEXCEPT_EXPR(*rhs = static_cast<optional &&>(*rhs)))
{
this->assign( static_cast<optional &&>(rhs) ) ;
return *this ;
}
#endif
// Assigns from a T (deep-copies the rhs value)
// Basic Guarantee: If T::( T const& ) throws, this is left UNINITIALIZED
optional& operator= ( argument_type val )
@ -581,6 +690,15 @@ class optional : public optional_detail::optional_base<T>
return *this ;
}
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
// Assigns from a T (deep-moves the rhs value)
optional& operator= ( rval_reference_type val )
{
this->assign( static_cast<rval_reference_type>(val) ) ;
return *this ;
}
#endif
// Assigns from a "none"
// Which destroys the current value, if any, leaving this UNINITIALIZED
// No-throw (assuming T::~T() doesn't)
@ -591,10 +709,10 @@ class optional : public optional_detail::optional_base<T>
}
void swap( optional & arg )
BOOST_NOEXCEPT_IF(BOOST_NOEXCEPT_EXPR(T(static_cast<optional &&>(*arg))) && BOOST_NOEXCEPT_EXPR(*arg = static_cast<optional &&>(*arg)))
{
// allow for Koenig lookup
using boost::swap;
swap(*this, arg);
boost::swap(*this, arg);
}
@ -961,6 +1079,7 @@ template<class T>
struct optional_swap_should_use_default_constructor : has_nothrow_default_constructor<T> {} ;
template<class T> inline void swap ( optional<T>& x, optional<T>& y )
BOOST_NOEXCEPT_IF(BOOST_NOEXCEPT_EXPR(T(static_cast<optional &&>(*x))) && BOOST_NOEXCEPT_EXPR(*y = static_cast<optional &&>(*x)))
{
optional_detail::swap_selector<optional_swap_should_use_default_constructor<T>::value>::optional_swap(x, y);
}