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<li class="navelem"><a class="el" href="namespacerttr.html">rttr</a></li><li class="navelem"><a class="el" href="classrttr_1_1instance.html">instance</a></li> </ul>
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<a href="#pub-methods">Public Member Functions</a> |
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<div class="title">rttr::instance Class Reference</div> </div>
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<p>The <a class="el" href="classrttr_1_1instance.html">instance</a> class is used for forwarding the instance of an object to invoke a <a class="el" href="classrttr_1_1property.html">property</a> or <a class="el" href="classrttr_1_1method.html">method</a>.
<a href="classrttr_1_1instance.html#details">More...</a></p>
<p><code>#include <<a class="el" href="instance_8h_source.html">instance.h</a>></code></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
<tr class="memitem:a0cf19f806ca5d41cf2341a08c0c3a38c"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#a0cf19f806ca5d41cf2341a08c0c3a38c">instance</a> () noexcept</td></tr>
<tr class="memdesc:a0cf19f806ca5d41cf2341a08c0c3a38c"><td class="mdescLeft"> </td><td class="mdescRight">Creates an <a class="el" href="classrttr_1_1instance.html#ad90b995a8f133187e207e8d3429a834f">invalid</a> instance object. <a href="#a0cf19f806ca5d41cf2341a08c0c3a38c">More...</a><br /></td></tr>
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<tr class="memitem:aa02e8bb582c3c36c1ff1f854bd1c50c2"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#aa02e8bb582c3c36c1ff1f854bd1c50c2">instance</a> (const <a class="el" href="classrttr_1_1variant.html">variant</a> &var) noexcept</td></tr>
<tr class="memdesc:aa02e8bb582c3c36c1ff1f854bd1c50c2"><td class="mdescLeft"> </td><td class="mdescRight">Creates an instance object from a <a class="el" href="classrttr_1_1variant.html">variant</a> object. <a href="#aa02e8bb582c3c36c1ff1f854bd1c50c2">More...</a><br /></td></tr>
<tr class="separator:aa02e8bb582c3c36c1ff1f854bd1c50c2"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ad75edc709129f77b63ac443e05d39616"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#ad75edc709129f77b63ac443e05d39616">instance</a> (const <a class="el" href="classrttr_1_1instance.html">instance</a> &other) noexcept</td></tr>
<tr class="memdesc:ad75edc709129f77b63ac443e05d39616"><td class="mdescLeft"> </td><td class="mdescRight">Copy constructor for an instance. <a href="#ad75edc709129f77b63ac443e05d39616">More...</a><br /></td></tr>
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<tr class="memitem:a18411165dd38b7e0bb1e4ad4a8cabb14"><td class="memTemplParams" colspan="2">template<typename T , typename Tp = decay_instance_t<T>> </td></tr>
<tr class="memitem:a18411165dd38b7e0bb1e4ad4a8cabb14"><td class="memTemplItemLeft" align="right" valign="top"> </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#a18411165dd38b7e0bb1e4ad4a8cabb14">instance</a> (T &data) noexcept</td></tr>
<tr class="memdesc:a18411165dd38b7e0bb1e4ad4a8cabb14"><td class="mdescLeft"> </td><td class="mdescRight">Creates an instance object from type <code>T</code>. <a href="#a18411165dd38b7e0bb1e4ad4a8cabb14">More...</a><br /></td></tr>
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<tr class="memitem:ac3a92f3645fff6e9f291712f4ffc79cc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classrttr_1_1type.html">type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#ac3a92f3645fff6e9f291712f4ffc79cc">get_derived_type</a> () const noexcept</td></tr>
<tr class="memdesc:ac3a92f3645fff6e9f291712f4ffc79cc"><td class="mdescLeft"> </td><td class="mdescRight">Returns the most derived type of the hold instance. <a href="#ac3a92f3645fff6e9f291712f4ffc79cc">More...</a><br /></td></tr>
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<tr class="memitem:a30c21e0d42b5321878e8e08c07a2a6ca"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classrttr_1_1type.html">type</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#a30c21e0d42b5321878e8e08c07a2a6ca">get_type</a> () const noexcept</td></tr>
<tr class="memdesc:a30c21e0d42b5321878e8e08c07a2a6ca"><td class="mdescLeft"> </td><td class="mdescRight">Returns the type of the internally hold instance. <a href="#a30c21e0d42b5321878e8e08c07a2a6ca">More...</a><br /></td></tr>
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<tr class="memitem:a3f97700e6a971a3c2f52d552c6de8892"><td class="memItemLeft" align="right" valign="top"><a class="el" href="classrttr_1_1instance.html">instance</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#a3f97700e6a971a3c2f52d552c6de8892">get_wrapped_instance</a> () const noexcept</td></tr>
<tr class="memdesc:a3f97700e6a971a3c2f52d552c6de8892"><td class="mdescLeft"> </td><td class="mdescRight">Returns an <a class="el" href="classrttr_1_1instance.html">instance</a> object for the wrapped instance. <a href="#a3f97700e6a971a3c2f52d552c6de8892">More...</a><br /></td></tr>
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<tr class="memitem:ad90b995a8f133187e207e8d3429a834f"><td class="memItemLeft" align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#ad90b995a8f133187e207e8d3429a834f">is_valid</a> () const noexcept</td></tr>
<tr class="memdesc:ad90b995a8f133187e207e8d3429a834f"><td class="mdescLeft"> </td><td class="mdescRight">Returns true when the instance class contains a reference to an object. <a href="#ad90b995a8f133187e207e8d3429a834f">More...</a><br /></td></tr>
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<tr class="memitem:aced57ace1ac8195a46d564c186f4d66a"><td class="memItemLeft" align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#aced57ace1ac8195a46d564c186f4d66a">operator bool</a> () const noexcept</td></tr>
<tr class="memdesc:aced57ace1ac8195a46d564c186f4d66a"><td class="mdescLeft"> </td><td class="mdescRight">Returns true when the instance class contains a reference to an object. <a href="#aced57ace1ac8195a46d564c186f4d66a">More...</a><br /></td></tr>
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<tr class="memitem:acbd9d9b07b3d59768b92aefb6d6d783a"><td class="memTemplParams" colspan="2">template<typename Target_Type > </td></tr>
<tr class="memitem:acbd9d9b07b3d59768b92aefb6d6d783a"><td class="memTemplItemLeft" align="right" valign="top">Target_Type * </td><td class="memTemplItemRight" valign="bottom"><a class="el" href="classrttr_1_1instance.html#acbd9d9b07b3d59768b92aefb6d6d783a">try_convert</a> () const noexcept</td></tr>
<tr class="memdesc:acbd9d9b07b3d59768b92aefb6d6d783a"><td class="mdescLeft"> </td><td class="mdescRight">This function will try to convert the underlying instance to the given type <code>Target_Type*</code>. <a href="#acbd9d9b07b3d59768b92aefb6d6d783a">More...</a><br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>The <a class="el" href="classrttr_1_1instance.html">instance</a> class is used for forwarding the instance of an object to invoke a <a class="el" href="classrttr_1_1property.html">property</a> or <a class="el" href="classrttr_1_1method.html">method</a>. </p>
<dl class="section remark"><dt>Remarks</dt><dd>The <a class="el" href="classrttr_1_1instance.html">instance</a> class will internally hold a reference to the object. It will not perform any copy operation on the data itself. Make sure you don't hold an <a class="el" href="classrttr_1_1instance.html">instance</a>, while the underlying object is already destroyed. Otherwise it will lead to undefined behavior. </dd></dl>
</div><h2 class="groupheader">Constructor & Destructor Documentation</h2>
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<p>Creates an <a class="el" href="classrttr_1_1instance.html#ad90b995a8f133187e207e8d3429a834f">invalid</a> instance object. </p>
<p>Use this constructor, when you need to invoke a property or method where no instance is required. </p>
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<p>Creates an instance object from a <a class="el" href="classrttr_1_1variant.html">variant</a> object. </p>
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<p>Copy constructor for an instance. </p>
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template<typename T , typename Tp = decay_instance_t<T>> </div>
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<p>Creates an instance object from type <code>T</code>. </p>
<dl class="section remark"><dt>Remarks</dt><dd>Internally, the instance class will hold a reference to the address of the given object <code>data</code>. </dd></dl>
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<h2 class="groupheader">Member Function Documentation</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ac3a92f3645fff6e9f291712f4ffc79cc">◆ </a></span>get_derived_type()</h2>
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<p>Returns the most derived type of the hold instance. </p>
<p>See following example code: </p><div class="fragment"><div class="line"><span class="keyword">struct </span>base { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>() };</div><div class="line"><span class="keyword">struct </span>middle : base { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>(base) };</div><div class="line"><span class="keyword">struct </span>derived : middle { <a class="code" href="rttr__enable_8h.html#a848bcae21d3a54e07ca6450689820a59">RTTR_ENABLE</a>(middle) };</div><div class="line"><span class="comment">//...</span></div><div class="line">derived d;</div><div class="line">base& b = d;</div><div class="line"><a class="code" href="classrttr_1_1instance.html#a0cf19f806ca5d41cf2341a08c0c3a38c">instance</a> obj = b;</div><div class="line"></div><div class="line">obj.get_type() == type::get<base>(); <span class="comment">// yields to true</span></div><div class="line">obj.get_derived_type() == type::get<derived>(); <span class="comment">// yields to true</span></div></div><!-- fragment -->
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<p>Returns the type of the internally hold instance. </p>
<dl class="section remark"><dt>Remarks</dt><dd>When no reference is stored, an <a class="el" href="classrttr_1_1type.html#a5d6b241be3e6a25d787248e0b9d6f20b">invalid</a> <a class="el" href="classrttr_1_1type.html">type</a> object will be returned.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>Type object of stored reference. </dd></dl>
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<p>Returns an <a class="el" href="classrttr_1_1instance.html">instance</a> object for the wrapped instance. </p>
<p>See following example code: </p><div class="fragment"><div class="line">std::shared_ptr<foo> f;</div><div class="line"><a class="code" href="classrttr_1_1instance.html#a0cf19f806ca5d41cf2341a08c0c3a38c">instance</a> obj = f;</div><div class="line"></div><div class="line">obj.get_type() == type::get<std::shared_ptr<foo>>(); <span class="comment">// yields to true</span></div><div class="line">obj.get_wrapped_instance().get_type() == type::get<foo>(); <span class="comment">// yields to true</span></div></div><!-- fragment --><dl class="section remark"><dt>Remarks</dt><dd>When the current instance is not a <a class="el" href="classrttr_1_1type.html#af1bd09e2408fbc2816e201c2d82df582">wrapper type</a>, an <a class="el" href="classrttr_1_1instance.html#ad90b995a8f133187e207e8d3429a834f">invalid</a> instance will be returned.</dd></dl>
<dl class="section return"><dt>Returns</dt><dd>An <a class="el" href="classrttr_1_1instance.html">instance</a> object from the wrapped type. </dd></dl>
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<p>Returns true when the instance class contains a reference to an object. </p>
<p>Otherwise false.</p>
<dl class="section return"><dt>Returns</dt><dd>True when a reference is stored, otherwise false. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#aced57ace1ac8195a46d564c186f4d66a">◆ </a></span>operator bool()</h2>
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<td class="memname">rttr::instance::operator bool </td>
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<td> const</td>
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<span class="mlabels"><span class="mlabel">explicit</span><span class="mlabel">noexcept</span></span> </td>
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<p>Returns true when the instance class contains a reference to an object. </p>
<p>Otherwise false.</p>
<dl class="section return"><dt>Returns</dt><dd>True when a reference is stored, otherwise false. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#acbd9d9b07b3d59768b92aefb6d6d783a">◆ </a></span>try_convert()</h2>
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template<typename Target_Type > </div>
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<p>This function will try to convert the underlying instance to the given type <code>Target_Type*</code>. </p>
<p>When the conversion succeeds, a valid pointer will be returned. Otherwise a nullptr.</p>
<dl class="section return"><dt>Returns</dt><dd>A pointer to the instance of <code>Target_Type</code>, when the conversion succeeds, otherwise a nullptr. </dd></dl>
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<hr/>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="instance_8h_source.html">instance.h</a></li>
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