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<div class="title">ref object </div> </div>
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<div class="textblock"><p><b>Path:</b> /sdk/add_on/scripthandle/</p>
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<p>The <code>ref</code> type is a generic container that can hold any handle. It is a value type, but behaves very much like an object handle.</p>
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<p>The type is registered with <code>RegisterScriptHandle(asIScriptEngine*)</code>.</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="doc_adv_generic_handle.html">Registering a generic handle type</a></dd></dl>
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<h1><a class="anchor" id="doc_addon_handle_1"></a>
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Public C++ interface</h1>
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<div class="fragment"><div class="line"><span class="keyword">class </span>CScriptHandle </div>
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<div class="line">{</div>
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<div class="line"><span class="keyword">public</span>:</div>
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<div class="line"> <span class="comment">// Constructors</span></div>
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<div class="line"> CScriptHandle();</div>
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<div class="line"> CScriptHandle(<span class="keyword">const</span> CScriptHandle &other);</div>
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<div class="line"> CScriptHandle(<span class="keywordtype">void</span> *ref, <span class="keywordtype">int</span> typeId);</div>
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<div class="line"> ~CScriptHandle();</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Copy the stored reference from another handle object</span></div>
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<div class="line"> CScriptHandle &operator=(<span class="keyword">const</span> CScriptHandle &other);</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Set the reference</span></div>
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<div class="line"> <span class="keywordtype">void</span> Set(<span class="keywordtype">void</span> *ref, <a class="code" href="classas_i_type_info.html">asITypeInfo</a> *type);</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Compare equalness</span></div>
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<div class="line"> <span class="keywordtype">bool</span> operator==(<span class="keyword">const</span> CScriptHandle &o) <span class="keyword">const</span>;</div>
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<div class="line"> <span class="keywordtype">bool</span> operator!=(<span class="keyword">const</span> CScriptHandle &o) <span class="keyword">const</span>;</div>
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<div class="line"> <span class="keywordtype">bool</span> opEquals(<span class="keywordtype">void</span> *ref, <span class="keywordtype">int</span> typeId) <span class="keyword">const</span>;</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Dynamic cast to desired handle type</span></div>
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<div class="line"> <span class="keywordtype">void</span> Cast(<span class="keywordtype">void</span> **outRef, <span class="keywordtype">int</span> typeId);</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Returns the type of the reference held</span></div>
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<div class="line"> <a class="code" href="classas_i_type_info.html">asITypeInfo</a> *GetType() <span class="keyword">const</span>;</div>
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<div class="line"> <span class="keywordtype">int</span> GetTypeId() <span class="keyword">const</span>;</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Returns the reference</span></div>
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<div class="line"> <span class="keywordtype">void</span> *GetRef();</div>
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<div class="line">};</div>
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</div><!-- fragment --><h1><a class="anchor" id="doc_addon_handle_3"></a>
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Public script interface</h1>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="doc_datatypes_ref.html">ref in the script language</a></dd></dl>
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<h1><a class="anchor" id="doc_addon_handle_4"></a>
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Example usage from C++</h1>
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<p>Even though the CScriptHandle is a value type, when registering properties of its type they should be registered as handles. The same goes for function arguments and return types.</p>
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<div class="fragment"><div class="line">CScriptHandle g_handle;</div>
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<div class="line"> </div>
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<div class="line"><span class="keywordtype">void</span> Function(CScriptHandle handle)</div>
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<div class="line">{</div>
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<div class="line"> ... use the methods of CScriptHandle to determine the <span class="keyword">true</span> <span class="keywordtype">object</span> held in it</div>
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<div class="line">}</div>
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<div class="line"> </div>
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<div class="line"><span class="keywordtype">void</span> Register(<a class="code" href="classas_i_script_engine.html">asIScriptEngine</a> *engine)</div>
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<div class="line">{</div>
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<div class="line"> <span class="keywordtype">int</span> r;</div>
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<div class="line"> r = engine-><a class="code" href="classas_i_script_engine.html#aacd32f32b2922b8ffaed204812013169">RegisterGlobalProperty</a>(<span class="stringliteral">"ref @g_handle"</span>, &g_handle); assert( r >= 0 );</div>
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<div class="line"> r = engine-><a class="code" href="classas_i_script_engine.html#a2f84b9b51733f22c68b8448b02c2f1c7">RegisterGlobalFunction</a>(<span class="stringliteral">"void Function(ref @)"</span>, <a class="code" href="angelscript_8h.html#a78f8f2c7f1c88b12e74a5ac47b4184ae">asFUNCTION</a>(Function), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a68ae43cc91cdfc3fa4590c9e6164e4f4">asCALL_CDECL</a>); assert( r >= 0 );</div>
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<div class="line">}</div>
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</div><!-- fragment --><p>To set an object pointer in the handle from the application, you'll use the Set() method passing a pointer to the object and the type of the object.</p>
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<p>To retrieve an object pointer from the application you'll use the Cast() method passing in a pointer to the pointer and the wanted type id. If the type id given doesn't match the stored handle the returned pointer will be null.</p>
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<p>To retrieve an object of an unknown type use the GetType() or GetTypeId() to determine the type stored in the handle, then use the Cast() method. </p>
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<div class="ttc" id="aclassas_i_script_engine_html"><div class="ttname"><a href="classas_i_script_engine.html">asIScriptEngine</a></div><div class="ttdoc">The engine interface.</div><div class="ttdef"><b>Definition:</b> angelscript.h:1092</div></div>
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<div class="ttc" id="aclassas_i_script_engine_html_a2f84b9b51733f22c68b8448b02c2f1c7"><div class="ttname"><a href="classas_i_script_engine.html#a2f84b9b51733f22c68b8448b02c2f1c7">asIScriptEngine::RegisterGlobalFunction</a></div><div class="ttdeci">virtual int RegisterGlobalFunction(const char *declaration, const asSFuncPtr &funcPointer, asDWORD callConv, void *auxiliary=0)=0</div><div class="ttdoc">Registers a global function.</div></div>
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<div class="ttc" id="aclassas_i_script_engine_html_aacd32f32b2922b8ffaed204812013169"><div class="ttname"><a href="classas_i_script_engine.html#aacd32f32b2922b8ffaed204812013169">asIScriptEngine::RegisterGlobalProperty</a></div><div class="ttdeci">virtual int RegisterGlobalProperty(const char *declaration, void *pointer)=0</div><div class="ttdoc">Registers a global property.</div></div>
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<div class="ttc" id="aangelscript_8h_html_a78f8f2c7f1c88b12e74a5ac47b4184ae"><div class="ttname"><a href="angelscript_8h.html#a78f8f2c7f1c88b12e74a5ac47b4184ae">asFUNCTION</a></div><div class="ttdeci">#define asFUNCTION(f)</div><div class="ttdoc">Returns an asSFuncPtr representing the function specified by the name.</div><div class="ttdef"><b>Definition:</b> angelscript.h:675</div></div>
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<div class="ttc" id="aclassas_i_type_info_html"><div class="ttname"><a href="classas_i_type_info.html">asITypeInfo</a></div><div class="ttdoc">The interface for describing types This interface is used to describe the types in the script engine.</div><div class="ttdef"><b>Definition:</b> angelscript.h:3527</div></div>
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<div class="ttc" id="aangelscript_8h_html_a3ec92ea3c4762e44c2df788ceccdd1e4a68ae43cc91cdfc3fa4590c9e6164e4f4"><div class="ttname"><a href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a68ae43cc91cdfc3fa4590c9e6164e4f4">asCALL_CDECL</a></div><div class="ttdeci">@ asCALL_CDECL</div><div class="ttdoc">A cdecl function.</div><div class="ttdef"><b>Definition:</b> angelscript.h:226</div></div>
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