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Member fun value() that throws on uninitialized

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This commit is contained in:
Andrzej Krzemienski
2014-05-22 23:32:49 +02:00
parent 5e59e10f93
commit 75271b73a8
11 changed files with 226 additions and 6 deletions
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28
doc/reference.qbk
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@ -74,6 +74,9 @@
T const& operator *() const ; ``[link reference_optional_get __GO_TO__]``
T& operator *() ; ``[link reference_optional_get __GO_TO__]``
T const& value() const ; ``[link reference_optional_value __GO_TO__]``
T& value() ; ``[link reference_optional_value __GO_TO__]``
T const* get_ptr() const ; ``[link reference_optional_get_ptr __GO_TO__]``
T* get_ptr() ; ``[link reference_optional_get_ptr __GO_TO__]``
@ -803,6 +806,31 @@ assert ( *opt == w ) ;
__SPACE__
[#reference_optional_value]
[: `T const& optional<T>::value() const ;`]
[: `T& optional<T>::value();`]
* [*Returns:] A reference to the contained value, if `*this` is initialized.
* [*Throws:] An instance of `bad_optional_access`, if `*this` is not initialized.
* [*Example:]
``
T v ;
optional<T> o0, o1 ( v );
assert ( o1.value() == v );
try {
o0.value(); // throws
assert ( false );
}
catch(bad_optional_access&) {
asert ( true );
}
``
__SPACE__
[#reference_optional_get_value_or_value]
[: `T const& optional<T` ['(not a ref)]`>::get_value_or( T const& default) const ;`]