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| <innerclass refid="classiceberg_1_1Lazy" prot="public">iceberg::Lazy</innerclass> |
| <innerclass refid="structiceberg_1_1Lazy_1_1Trait_3_01R_07_5_08_07Args_8_8_8_08_4" prot="private">iceberg::Lazy::Trait< R(*)(Args...)></innerclass> |
| <innernamespace refid="namespaceiceberg">iceberg</innernamespace> |
| <briefdescription> |
| </briefdescription> |
| <detaileddescription> |
| <para>Lazy initialization utility. </para> |
| </detaileddescription> |
| <programlisting> |
| <codeline lineno="1"><highlight class="comment">/*</highlight></codeline> |
| <codeline lineno="2"><highlight class="comment"><sp/>*<sp/>Licensed<sp/>to<sp/>the<sp/>Apache<sp/>Software<sp/>Foundation<sp/>(ASF)<sp/>under<sp/>one</highlight></codeline> |
| <codeline lineno="3"><highlight class="comment"><sp/>*<sp/>or<sp/>more<sp/>contributor<sp/>license<sp/>agreements.<sp/><sp/>See<sp/>the<sp/>NOTICE<sp/>file</highlight></codeline> |
| <codeline lineno="4"><highlight class="comment"><sp/>*<sp/>distributed<sp/>with<sp/>this<sp/>work<sp/>for<sp/>additional<sp/>information</highlight></codeline> |
| <codeline lineno="5"><highlight class="comment"><sp/>*<sp/>regarding<sp/>copyright<sp/>ownership.<sp/><sp/>The<sp/>ASF<sp/>licenses<sp/>this<sp/>file</highlight></codeline> |
| <codeline lineno="6"><highlight class="comment"><sp/>*<sp/>to<sp/>you<sp/>under<sp/>the<sp/>Apache<sp/>License,<sp/>Version<sp/>2.0<sp/>(the</highlight></codeline> |
| <codeline lineno="7"><highlight class="comment"><sp/>*<sp/>"License");<sp/>you<sp/>may<sp/>not<sp/>use<sp/>this<sp/>file<sp/>except<sp/>in<sp/>compliance</highlight></codeline> |
| <codeline lineno="8"><highlight class="comment"><sp/>*<sp/>with<sp/>the<sp/>License.<sp/><sp/>You<sp/>may<sp/>obtain<sp/>a<sp/>copy<sp/>of<sp/>the<sp/>License<sp/>at</highlight></codeline> |
| <codeline lineno="9"><highlight class="comment"><sp/>*</highlight></codeline> |
| <codeline lineno="10"><highlight class="comment"><sp/>*<sp/><sp/><sp/>http://www.apache.org/licenses/LICENSE-2.0</highlight></codeline> |
| <codeline lineno="11"><highlight class="comment"><sp/>*</highlight></codeline> |
| <codeline lineno="12"><highlight class="comment"><sp/>*<sp/>Unless<sp/>required<sp/>by<sp/>applicable<sp/>law<sp/>or<sp/>agreed<sp/>to<sp/>in<sp/>writing,</highlight></codeline> |
| <codeline lineno="13"><highlight class="comment"><sp/>*<sp/>software<sp/>distributed<sp/>under<sp/>the<sp/>License<sp/>is<sp/>distributed<sp/>on<sp/>an</highlight></codeline> |
| <codeline lineno="14"><highlight class="comment"><sp/>*<sp/>"AS<sp/>IS"<sp/>BASIS,<sp/>WITHOUT<sp/>WARRANTIES<sp/>OR<sp/>CONDITIONS<sp/>OF<sp/>ANY</highlight></codeline> |
| <codeline lineno="15"><highlight class="comment"><sp/>*<sp/>KIND,<sp/>either<sp/>express<sp/>or<sp/>implied.<sp/><sp/>See<sp/>the<sp/>License<sp/>for<sp/>the</highlight></codeline> |
| <codeline lineno="16"><highlight class="comment"><sp/>*<sp/>specific<sp/>language<sp/>governing<sp/>permissions<sp/>and<sp/>limitations</highlight></codeline> |
| <codeline lineno="17"><highlight class="comment"><sp/>*<sp/>under<sp/>the<sp/>License.</highlight></codeline> |
| <codeline lineno="18"><highlight class="comment"><sp/>*/</highlight><highlight class="normal"></highlight></codeline> |
| <codeline lineno="19"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="20"><highlight class="normal"></highlight><highlight class="preprocessor">#pragma<sp/>once</highlight><highlight class="normal"></highlight></codeline> |
| <codeline lineno="21"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="24"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="25"><highlight class="normal"></highlight><highlight class="preprocessor">#include<sp/><concepts></highlight><highlight class="normal"></highlight></codeline> |
| <codeline lineno="26"><highlight class="normal"></highlight><highlight class="preprocessor">#include<sp/><functional></highlight><highlight class="normal"></highlight></codeline> |
| <codeline lineno="27"><highlight class="normal"></highlight><highlight class="preprocessor">#include<sp/><mutex></highlight><highlight class="normal"></highlight></codeline> |
| <codeline lineno="28"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="29"><highlight class="normal"></highlight><highlight class="preprocessor">#include<sp/>"iceberg/result.h"</highlight><highlight class="normal"></highlight></codeline> |
| <codeline lineno="30"><highlight class="normal"></highlight><highlight class="preprocessor">#include<sp/>"iceberg/util/macros.h"</highlight><highlight class="normal"></highlight></codeline> |
| <codeline lineno="31"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="32"><highlight class="normal"></highlight><highlight class="keyword">namespace<sp/></highlight><highlight class="normal">iceberg<sp/>{</highlight></codeline> |
| <codeline lineno="33"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="34"><highlight class="normal"></highlight><highlight class="keyword">template</highlight><highlight class="normal"><sp/><auto<sp/>InitFunc></highlight></codeline> |
| <codeline lineno="35" refid="classiceberg_1_1Lazy" refkind="compound"><highlight class="normal"></highlight><highlight class="keyword">class<sp/></highlight><highlight class="normal"><ref refid="classiceberg_1_1Lazy" kindref="compound">Lazy</ref><sp/>{</highlight></codeline> |
| <codeline lineno="36"><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">template</highlight><highlight class="normal"><sp/><</highlight><highlight class="keyword">typename</highlight><highlight class="normal"><sp/>R></highlight></codeline> |
| <codeline lineno="37"><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">struct<sp/></highlight><highlight class="normal">Trait;</highlight></codeline> |
| <codeline lineno="38"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="39"><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">template</highlight><highlight class="normal"><sp/><</highlight><highlight class="keyword">typename</highlight><highlight class="normal"><sp/>R,<sp/></highlight><highlight class="keyword">typename</highlight><highlight class="normal">...<sp/>Args></highlight></codeline> |
| <codeline lineno="40"><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">struct<sp/></highlight><highlight class="normal">Trait<R<sp/>(*)(Args...)><sp/>{</highlight></codeline> |
| <codeline lineno="41"><highlight class="normal"><sp/><sp/><sp/><sp/></highlight><highlight class="keyword">using<sp/></highlight><highlight class="normal">ReturnType<sp/>=<sp/>R::value_type;</highlight></codeline> |
| <codeline lineno="42"><highlight class="normal"><sp/><sp/>};</highlight></codeline> |
| <codeline lineno="43"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="44"><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">using<sp/></highlight><highlight class="normal">T<sp/>=<sp/>Trait<</highlight><highlight class="keyword">decltype</highlight><highlight class="normal">(InitFunc)>::ReturnType;</highlight></codeline> |
| <codeline lineno="45"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="46"><highlight class="normal"><sp/></highlight><highlight class="keyword">public</highlight><highlight class="normal">:</highlight></codeline> |
| <codeline lineno="47"><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">template</highlight><highlight class="normal"><sp/><</highlight><highlight class="keyword">typename</highlight><highlight class="normal">...<sp/>Args></highlight></codeline> |
| <codeline lineno="48"><highlight class="normal"><sp/><sp/><sp/><sp/></highlight><highlight class="keyword">requires</highlight><highlight class="normal"><sp/>std::invocable<</highlight><highlight class="keyword">decltype</highlight><highlight class="normal">(InitFunc),<sp/>Args...><sp/>&&</highlight></codeline> |
| <codeline lineno="49"><highlight class="normal"><sp/><sp/><sp/><sp/><sp/><sp/><sp/><sp/><sp/><sp/><sp/><sp/><sp/>std::same_as<std::invoke_result_t<</highlight><highlight class="keyword">decltype</highlight><highlight class="normal">(InitFunc),<sp/>Args...>,<sp/>Result<T>></highlight></codeline> |
| <codeline lineno="50"><highlight class="normal"><sp/><sp/>Result<std::reference_wrapper<T>><sp/>Get(Args&&...<sp/>args)</highlight><highlight class="keyword"><sp/>const<sp/></highlight><highlight class="normal">{</highlight></codeline> |
| <codeline lineno="51"><highlight class="normal"><sp/><sp/><sp/><sp/>Result<T><sp/>result;</highlight></codeline> |
| <codeline lineno="52"><highlight class="normal"><sp/><sp/><sp/><sp/>std::call_once(flag_,<sp/>[&result,<sp/></highlight><highlight class="keyword">this</highlight><highlight class="normal">,<sp/>&args...]()<sp/>{</highlight></codeline> |
| <codeline lineno="53"><highlight class="normal"><sp/><sp/><sp/><sp/><sp/><sp/>result<sp/>=<sp/>InitFunc(std::forward<Args>(args)...);</highlight></codeline> |
| <codeline lineno="54"><highlight class="normal"><sp/><sp/><sp/><sp/><sp/><sp/>if<sp/>(result)<sp/>{</highlight></codeline> |
| <codeline lineno="55"><highlight class="normal"><sp/><sp/><sp/><sp/><sp/><sp/><sp/><sp/>this->value_<sp/>=<sp/>std::move(result.value());</highlight></codeline> |
| <codeline lineno="56"><highlight class="normal"><sp/><sp/><sp/><sp/><sp/><sp/>}</highlight></codeline> |
| <codeline lineno="57"><highlight class="normal"><sp/><sp/><sp/><sp/>});</highlight></codeline> |
| <codeline lineno="58"><highlight class="normal"><sp/><sp/><sp/><sp/>ICEBERG_RETURN_UNEXPECTED(result);</highlight></codeline> |
| <codeline lineno="59"><highlight class="normal"><sp/><sp/><sp/><sp/></highlight><highlight class="keywordflow">return</highlight><highlight class="normal"><sp/>std::ref(value_);</highlight></codeline> |
| <codeline lineno="60"><highlight class="normal"><sp/><sp/>}</highlight></codeline> |
| <codeline lineno="61"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="62"><highlight class="normal"><sp/></highlight><highlight class="keyword">private</highlight><highlight class="normal">:</highlight></codeline> |
| <codeline lineno="63"><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">mutable</highlight><highlight class="normal"><sp/>T<sp/>value_;</highlight></codeline> |
| <codeline lineno="64"><highlight class="normal"><sp/><sp/></highlight><highlight class="keyword">mutable</highlight><highlight class="normal"><sp/>std::once_flag<sp/>flag_;</highlight></codeline> |
| <codeline lineno="65"><highlight class="normal">};</highlight></codeline> |
| <codeline lineno="66"><highlight class="normal"></highlight></codeline> |
| <codeline lineno="67"><highlight class="normal">};<sp/><sp/></highlight><highlight class="comment">//<sp/>namespace<sp/>iceberg</highlight><highlight class="normal"></highlight></codeline> |
| </programlisting> |
| <location file="iceberg/util/lazy.h"/> |
| </compounddef> |
| </doxygen> |
