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Added function value_or()

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Andrzej Krzemienski
2014-05-23 16:38:42 +02:00
parent 75271b73a8
commit 3984c9f9a1
7 changed files with 100 additions and 18 deletions
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22
doc/reference.qbk
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@ -66,9 +66,6 @@
T const& get() const ; ``[link reference_optional_get __GO_TO__]``
T& get() ; ``[link reference_optional_get __GO_TO__]``
// [new in 1.34]
T const& get_value_or( T const& default ) const ; ``[link reference_optional_get_value_or_value __GO_TO__]``
T const* operator ->() const ; ``[link reference_optional_operator_arrow __GO_TO__]``
T* operator ->() ; ``[link reference_optional_operator_arrow __GO_TO__]``
@ -77,6 +74,8 @@
T const& value() const ; ``[link reference_optional_value __GO_TO__]``
T& value() ; ``[link reference_optional_value __GO_TO__]``
template<class U> T value_or( U && v ) const ; ``[link reference_optional_value_or __GO_TO__]``
T const* get_ptr() const ; ``[link reference_optional_get_ptr __GO_TO__]``
T* get_ptr() ; ``[link reference_optional_get_ptr __GO_TO__]``
@ -96,6 +95,8 @@
// (deprecated)
bool is_initialized() const ; ``[link reference_optional_is_initialized __GO_TO__]``
// (deprecated)
T const& get_value_or( T const& default ) const ; ``[link reference_optional_get_value_or_value __GO_TO__]``
};
template<class T> inline bool operator == ( optional<T> const& x, optional<T> const& y ) ; ``[link reference_operator_compare_equal_optional_optional __GO_TO__]``
@ -114,13 +115,10 @@
template<class T> inline bool operator != ( optional<T> const& x, none_t ) noexcept ; ``[link reference_operator_compare_not_equal_optional_none __GO_TO__]``
// [new in 1.34]
template<class T> inline optional<T> make_optional ( T const& v ) ; ``[link reference_make_optional_value __GO_TO__]``
// [new in 1.34]
template<class T> inline optional<T> make_optional ( bool condition, T const& v ) ; ``[link reference_make_optional_bool_value __GO_TO__]``
// [new in 1.34]
template<class T> inline T const& get_optional_value_or ( optional<T> const& opt, T const& default ) ; ``[link reference_optional_get_value_or_value __GO_TO__]``
template<class T> inline T const& get ( optional<T> const& opt ) ; ``[link reference_optional_get __GO_TO__]``
@ -828,6 +826,17 @@ catch(bad_optional_access&) {
asert ( true );
}
``
__SPACE__
[#reference_optional_value_or]
[: `template<class U> T optional<T>::value_or(U && v) const ;`]
* [*Requires:] `T` is CopyConstructible.
* [*Returns:] `bool(*this) ? **this : static_cast<T>(forward<U>(v))`.
* [*Throws:] Any exception thrown by the selected constructor of `T`.
* [*Notes:] On compilers without rvalue reference support the type of `v` becomes `U const&`.
__SPACE__
@ -839,6 +848,7 @@ __SPACE__
[: `inline T const& get_optional_value_or ( optional<T` ['(not a ref)]`> const& o, T const& default ) ;`]
[: `inline T& get_optional_value_or ( optional<T` ['(not a ref)]`>& o, T& default ) ;`]
* [*Deprecated:] Use `value_or()` instead.
* [*Returns:] A reference to the contained value, if any, or `default`.
* [*Throws:] Nothing.
* [*Example:]