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rvalue ref overloads do not return by value

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Andrzej Krzemienski
2014-07-10 13:49:36 +02:00
parent 18b8c4bb18
commit fea4882f24
5 changed files with 25 additions and 74 deletions
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21
doc/20_reference.qbk
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@ -73,13 +73,11 @@
T const& operator *() const& ; ``[link reference_optional_operator_asterisk __GO_TO__]``
T& operator *() & ; ``[link reference_optional_operator_asterisk __GO_TO__]``
T operator *() && ; ``[link reference_optional_operator_asterisk_move __GO_TO__]``
T operator *() const&& ; ``[link reference_optional_operator_asterisk_move __GO_TO__]``
T&& operator *() && ; ``[link reference_optional_operator_asterisk_move __GO_TO__]``
T const& value() const& ; ``[link reference_optional_value __GO_TO__]``
T& value() & ; ``[link reference_optional_value __GO_TO__]``
T value() && ; ``[link reference_optional_value_move __GO_TO__]``
T value() const&& ; ``[link reference_optional_value_move __GO_TO__]``
T&& value() && ; ``[link reference_optional_value_move __GO_TO__]``
template<class U> T value_or( U && v ) const& ; ``[link reference_optional_value_or __GO_TO__]``
template<class U> T value_or( U && v ) && ; ``[link reference_optional_value_or_move __GO_TO__]``
@ -864,25 +862,22 @@ __SPACE__
[#reference_optional_operator_asterisk_move]
[: `T optional<T` ['(not a ref)]`>::operator*() &&;`]
[: `T optional<T` ['(not a ref)]`>::operator*() const&&;`]
[: `T&& optional<T` ['(not a ref)]`>::operator*() &&;`]
* [*Requires:] `*this` contains a value.
* [*Effects:] Equivalent to `return std::move(*val);`.
* [*Remarks:] If `T` is not __MOVE_CONSTRUCTIBLE__, the program is ill-formed.
* [*Notes:] The requirement is asserted via `BOOST_ASSERT()`. On GCC compiler the second overload is not present, as this compiler incorrectly implements binding of references to const prvalues. On compilers that do not support ref-qualifiers on member functions both these overloads are not present.
* [*Notes:] The requirement is asserted via `BOOST_ASSERT()`. On compilers that do not support ref-qualifiers on member functions this overload is not present.
__SPACE__
[: `T & optional<T&>::operator*() const& ;`]
[: `T & optional<T&>::operator*() & ;`]
[: `T & optional<T&>::operator*() && ;`]
[: `T & optional<T&>::operator*() const&& ;`]
* [*Requires: ] `*this` is initialized
* [*Returns:] [_The] reference contained.
* [*Throws:] Nothing.
* [*Notes:] The requirement is asserted via `BOOST_ASSERT()`. On GCC compiler the fourth overload is not present, as this compiler incorrectly implements binding of references to const prvalues. On compilers that do not support ref-qualifiers on member functions these four overloads are replaced with the classical two: a `const` and non-`const` member functions.
* [*Notes:] The requirement is asserted via `BOOST_ASSERT()`. On compilers that do not support ref-qualifiers on member functions these three overloads are replaced with the classical two: a `const` and non-`const` member functions.
* [*Example:]
``
T v ;
@ -922,12 +917,10 @@ __SPACE__
[#reference_optional_value_move]
[: `T optional<T>::value() && ;`]
[: `T optional<T>::value() const&& ;`]
[: `T&& optional<T>::value() && ;`]
* [*Effects:] Equivalent to `return bool(*this) ? std::move(*val) : throw bad_optional_access();`.
* [*Remarks:] If `T` is not __MOVE_CONSTRUCTIBLE__, the program is ill-formed.
* [*Notes:] On GCC compiler the second overload is not present, as this compiler incorrectly implements binding of references to const prvalues. On compilers that do not support ref-qualifiers on member functions both these overloads are not present.
* [*Notes:] On compilers that do not support ref-qualifiers on member functions this overload is not present.
__SPACE__