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Added ref-qualifiers to some accessors

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This commit is contained in:
Andrzej Krzemienski
2014-06-03 23:07:19 +02:00
parent 2e583aaf30
commit f99618f09b
3 changed files with 74 additions and 4 deletions
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47
include/boost/optional/optional.hpp
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@ -958,9 +958,40 @@ class optional : public optional_detail::optional_base<T>
// Returns a reference to the value if this is initialized, otherwise,
// the behaviour is UNDEFINED
// No-throw
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
reference_const_type operator *() const& { return this->get() ; }
reference_type operator *() & { return this->get() ; }
rval_reference_type operator *() && { return boost::move(this->get()) ; }
#else
reference_const_type operator *() const { return this->get() ; }
reference_type operator *() { return this->get() ; }
#endif
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
reference_const_type value() const&
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access("Attempted to access the value of an uninitialized optional object."));
}
reference_type value() &
{
if (this->is_initialized())
return this->get() ;
else
throw_exception(bad_optional_access("Attempted to access the value of an uninitialized optional object."));
}
rval_reference_type value() &&
{
if (this->is_initialized())
return boost::move(this->get()) ;
else
throw_exception(bad_optional_access("Attempted to access the value of an uninitialized optional object."));
}
#else
reference_const_type value() const
{
if (this->is_initialized())
@ -976,10 +1007,20 @@ class optional : public optional_detail::optional_base<T>
else
throw_exception(bad_optional_access("Attempted to access the value of an uninitialized optional object."));
}
#endif
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
#ifndef BOOST_NO_CXX11_REF_QUALIFIERS
template <class U>
value_type value_or ( U&& v ) const { return this->is_initialized() ? get() : static_cast<value_type>(boost::forward<U>(v)); }
value_type value_or ( U&& v ) const&
{ return this->is_initialized() ? get() : static_cast<value_type>(boost::forward<U>(v)); }
template <class U>
value_type value_or ( U&& v ) &&
{ return this->is_initialized() ? boost::move(get()) : static_cast<value_type>(boost::forward<U>(v)); }
#elif !defined BOOST_NO_CXX11_RVALUE_REFERENCES
template <class U>
value_type value_or ( U&& v ) const
{ return this->is_initialized() ? get() : static_cast<value_type>(boost::forward<U>(v)); }
#else
template <class U>
value_type value_or ( U const& v ) const { return this->is_initialized() ? get() : static_cast<value_type>(v); }