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<div class="title">Registering a function </div> </div>
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<div class="contents">
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<div class="textblock"><p>This article aims to explain the way functions are registered with AngelScript, and some of the differences between C++ and AngelScript that the developer needs to be aware of in order to be successful in registering the application interface that the scripts will use. The principles learned here are used in several locations, such as <a class="el" href="classas_i_script_engine.html#a2f84b9b51733f22c68b8448b02c2f1c7">RegisterGlobalFunction</a>, <a class="el" href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">RegisterObjectMethod</a>, <a class="el" href="classas_i_script_engine.html#a9f122dd87394f3a83ac766ea19f37317">RegisterObjectBehaviour</a>, etc.</p>
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<h1><a class="anchor" id="doc_register_func_1"></a>
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How to get the address of the application function or method</h1>
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<p>The macros <a class="el" href="angelscript_8h.html#a78f8f2c7f1c88b12e74a5ac47b4184ae">asFUNCTION</a>, <a class="el" href="angelscript_8h.html#a153aee5a6228913a469b6e6867e54efb">asFUNCTIONPR</a>, <a class="el" href="angelscript_8h.html#a7345e6b3afabec24efd0ff77886d49a6">asMETHOD</a>, and <a class="el" href="angelscript_8h.html#ac45ccb5854326cce38d721e2c00f1563">asMETHODPR</a> have been implemented to facilitate the task of getting the function pointer and passing them on to the script engine.</p>
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<p>The asFUNCTION takes the function name as the parameter, which works for all global functions that do not have any overloads. If you use overloads, i.e. multiple functions with the same name but with different parameters, then you need to use asFUNCTIONPR instead. This macro takes as parameter the function name, parameter list, and return type, so that the C++ compiler can resolve exactly which overloaded function to take the address of.</p>
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<div class="fragment"><div class="line"><span class="comment">// Global function</span></div>
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<div class="line"><span class="keywordtype">void</span> globalFunc();</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 globalFunc()"</span>, <a class="code" href="angelscript_8h.html#a78f8f2c7f1c88b12e74a5ac47b4184ae">asFUNCTION</a>(globalFunc), <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 class="line"><span class="comment">// Overloaded global functions</span></div>
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<div class="line"><span class="keywordtype">void</span> globalFunc2(<span class="keywordtype">int</span>);</div>
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<div class="line"><span class="keywordtype">void</span> globalFunc2(<span class="keywordtype">float</span>);</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 globalFunc2(int)"</span>, <a class="code" href="angelscript_8h.html#a153aee5a6228913a469b6e6867e54efb">asFUNCTIONPR</a>(globalFunc2, (<span class="keywordtype">int</span>), <span class="keywordtype">void</span>), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a68ae43cc91cdfc3fa4590c9e6164e4f4">asCALL_CDECL</a>); assert( r >= 0 );</div>
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</div><!-- fragment --><p>The same goes for asMETHOD and asMETHODPR. The difference between these and asFUNCTION/asFUNCTIONPR is that the former take the class name as well as parameter.</p>
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<div class="fragment"><div class="line"><span class="keyword">class </span>Object</div>
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<div class="line">{</div>
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<div class="line"> <span class="comment">// Class method</span></div>
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<div class="line"> <span class="keywordtype">void</span> method();</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Overloaded method</span></div>
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<div class="line"> <span class="keywordtype">void</span> method2(<span class="keywordtype">int</span> input);</div>
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<div class="line"> <span class="keywordtype">void</span> method2(<span class="keywordtype">int</span> input, <span class="keywordtype">int</span> &output);</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Const method</span></div>
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<div class="line"> <span class="keywordtype">int</span> getAttr(<span class="keywordtype">int</span>) <span class="keyword">const</span>;</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="comment">// Registering the class method</span></div>
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<div class="line">r = engine-><a class="code" href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">RegisterObjectMethod</a>(<span class="stringliteral">"object"</span>, <span class="stringliteral">"void method()"</span>, <a class="code" href="angelscript_8h.html#a7345e6b3afabec24efd0ff77886d49a6">asMETHOD</a>(Object,method), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96">asCALL_THISCALL</a>); assert( r >= 0 );</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Registering the overloaded methods</span></div>
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<div class="line">r = engine-><a class="code" href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">RegisterObjectMethod</a>(<span class="stringliteral">"object"</span>, <span class="stringliteral">"void method2(int)"</span>, <a class="code" href="angelscript_8h.html#ac45ccb5854326cce38d721e2c00f1563">asMETHODPR</a>(Object, method2, (<span class="keywordtype">int</span>), <span class="keywordtype">void</span>), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96">asCALL_THISCALL</a>); assert( r >= 0 );</div>
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<div class="line">r = engine-><a class="code" href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">RegisterObjectMethod</a>(<span class="stringliteral">"object"</span>, <span class="stringliteral">"void method2(int, int &out)"</span>, <a class="code" href="angelscript_8h.html#ac45ccb5854326cce38d721e2c00f1563">asMETHODPR</a>(Object, method2, (<span class="keywordtype">int</span>, <span class="keywordtype">int</span>&), <span class="keywordtype">void</span>), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96">asCALL_THISCALL</a>); assert( r >= 0 );</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Registering a const method</span></div>
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<div class="line">r = engine-><a class="code" href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">RegisterObjectMethod</a>(<span class="stringliteral">"object"</span>, <span class="stringliteral">"int getAttr(int) const"</span>, <a class="code" href="angelscript_8h.html#ac45ccb5854326cce38d721e2c00f1563">asMETHODPR</a>(Object, getAttr, (<span class="keywordtype">int</span>) <span class="keyword">const</span>, <span class="keywordtype">int</span>), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96">asCALL_THISCALL</a>); assert( r >= 0 );</div>
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</div><!-- fragment --><dl class="section note"><dt>Note</dt><dd>asMETHOD doesn't work well for classes with multiple inheritances. On some compilers the method pointer ends up referring to the wrong base class due to a limitation in the C++ compiler. The solution then is to use the asMETHODPR macro.</dd></dl>
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<p>It is possible to register a class method to be called from the script as if it was a global function. This is commonly done when exposing a singleton to the script interface, as the singleton's methods then look like ordinary global functions. When this is done the application must have a reference to the object at the time of the registration and the application must guarantee that the object is alive until it is no longer possible for the scripts to call the method.</p>
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<div class="fragment"><div class="line"><span class="keyword">class </span>MySingleton</div>
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<div class="line">{</div>
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<div class="line"> <span class="comment">// Class method to be called from script as if a global function</span></div>
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<div class="line"> <span class="keywordtype">void</span> MyGlobalFunc(<span class="keywordtype">int</span> arg1, <span class="keywordtype">int</span> arg2);</div>
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<div class="line">};</div>
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<div class="line"> </div>
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<div class="line">MySingleton single;</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Registering the singleton's method as if a global function</span></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 MyGlobalFunc(int, int)"</span>, <a class="code" href="angelscript_8h.html#a7345e6b3afabec24efd0ff77886d49a6">asMETHOD</a>(MySingleton, MyGlobalFunc), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aa241a0c1deedaa2d55eb99a83829efad">asCALL_THISCALL_ASGLOBAL</a>, &single); assert( r >= 0 );</div>
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</div><!-- fragment --><h1><a class="anchor" id="doc_register_func_2"></a>
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Calling convention</h1>
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<p>AngelScript accepts most common calling conventions that C++ uses, i.e. cdecl, stdcall, and thiscall. There is also a generic calling convention that can be used for example when native calling conventions are not supported on the target platform.</p>
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<p>All functions and behaviours must be registered with the <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a68ae43cc91cdfc3fa4590c9e6164e4f4">asCALL_CDECL</a>, <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a138a08e8363ebc695636dfe987674e2e">asCALL_STDCALL</a>, <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96">asCALL_THISCALL</a>, or <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a750c26b6a6e0c9ccbb93078f532ef8ce">asCALL_GENERIC</a> flags to tell AngelScript which calling convention the application function uses. The special conventions <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4ac08652c72f1cc0dc81c37812fab0e253">asCALL_CDECL_OBJLAST</a> and <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a7c3e88628c2722d0a103b411d4aceaa0">asCALL_CDECL_OBJFIRST</a> can also be used wherever asCALL_THISCALL is accepted, in order to simulate a class method through a global function. Functor objects can also be used to emulate global functions with the convention <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aa241a0c1deedaa2d55eb99a83829efad">asCALL_THISCALL_ASGLOBAL</a>, or class methods with the conventions <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a613a388ed51315f6fce19f3824d6b17a">asCALL_THISCALL_OBJFIRST</a> and <a class="el" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4a491f0ab2b66032a7b5541364f7f225b1">asCALL_THISCALL_OBJLAST</a>.</p>
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<p>If the incorrect calling convention is given on the registration you'll very likely see the application crash with a stack corruption whenever the script engine calls the function. cdecl is the default calling convention for all global functions in C++ programs, so if in doubt try with asCALL_CDECL first. The calling convention only differs from cdecl if the function is explicitly declared to use a different convention, or if you've set the compiler options to default to another convention.</p>
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<p>For class methods there is only the thiscall convention, except when the method is static, as those methods are in truth global functions in the class namespace. Normal methods, virtual methods, and methods for classes with multiple inheritance are all registered the same way, with asCALL_THISCALL.</p>
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<p>Classes with <a class="el" href="doc_register_func.html#doc_register_func_4">virtual inheritance are not supported natively</a>, and for these it will be necessary to create wrapper functions. These wrapper functions can either be implemented manually, or the template based automatic wrappers from the <a class="el" href="doc_addon_autowrap.html">add-on</a> can be used.</p>
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<dl class="section see"><dt>See also</dt><dd><a class="el" href="doc_generic.html">The generic calling convention</a></dd></dl>
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<h1><a class="anchor" id="doc_register_func_3"></a>
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A little on type differences</h1>
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<p>AngelScript supports most of the same types that C++ has, but there are differences that you'll need to know when registering functions, methods, and behaviours. Make sure you read and understand the article <a class="el" href="doc_as_vs_cpp_types.html">Datatypes in AngelScript and C++</a>.</p>
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<p>When registering functions that take references, you must make sure to inform the correct keyword that informs the intention of the data in the reference. For example, a parameter reference that is meant to be used as input should have the keyword 'in' defined after the & character, and an output reference should have the keyword 'out'. <a class="el" href="doc_reg_basicref.html">Reference types</a> can be passed as both input and output references, in which case the keyword 'inout' can be used, or simply no keyword at all. <a class="el" href="doc_register_val_type.html">Value types</a> on the other hand cannot use 'inout' references, as AngelScript cannot guarantee that the reference will be valid during the whole execution of the function.</p>
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<p>When registering functions that take pointers, you need to determine what the pointer represents. If the pointer is to a value type though, then it can only be registered as a reference. If the pointer is to a reference type, then it can be registered as an <a class="el" href="doc_obj_handle.html">object handle</a>, or as a plain reference. If you choose to use the object handle then you need to pay attention to the reference counter in the type so you don't get problems with memory leaks or crashes due to objects being destroyed too early.</p>
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<h1><a class="anchor" id="doc_register_func_4"></a>
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Virtual inheritance is not supported</h1>
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<p>Registering class methods for classes with virtual inheritance is not supported due to the high complexity involved with them. Each compiler implements the method pointers for these classes differently, and keeping the code portable would be very difficult. This is not a great loss though, as classes with virtual inheritance are relatively rare, and it is easy to write simple proxy functions where the classes to exist.</p>
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<div class="fragment"><div class="line"><span class="keyword">class </span>A { <span class="keywordtype">void</span> SomeMethodA(); };</div>
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<div class="line"><span class="keyword">class </span>B : <span class="keyword">virtual</span> A {};</div>
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<div class="line"><span class="keyword">class </span>C : <span class="keyword">virtual</span> A {};</div>
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<div class="line"><span class="keyword">class </span>D : <span class="keyword">public</span> B, <span class="keyword">public</span> C {};</div>
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<div class="line"> </div>
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<div class="line"><span class="comment">// Need a proxy function for registering SomeMethodA for class D</span></div>
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<div class="line"><span class="keywordtype">void</span> D_SomeMethodA_proxy(D *d)</div>
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<div class="line">{</div>
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<div class="line"> <span class="comment">// The C++ compiler will resolve the virtual method for us</span></div>
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<div class="line"> d->SomeMethodA();</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="comment">// Register the global function as if it was a class method, </span></div>
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<div class="line"><span class="comment">// but with calling convention asCALL_CDECL_OBJLAST</span></div>
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<div class="line">engine-><a class="code" href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">RegisterObjectMethod</a>(<span class="stringliteral">"D"</span>, <span class="stringliteral">"void SomeMethodA()"</span>, <a class="code" href="angelscript_8h.html#a78f8f2c7f1c88b12e74a5ac47b4184ae">asFUNCTION</a>(D_SomeMethodA_proxy), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4ac08652c72f1cc0dc81c37812fab0e253">asCALL_CDECL_OBJLAST</a>);</div>
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</div><!-- fragment --><p>If you have a lot of classes with virtual inheritance, you should probably think about writing a template proxy function, so you don't have to manually write all the proxy functions. </p>
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<div class="ttc" id="aclassas_i_script_engine_html_ad74043be9cc30f105c62f482ca720574"><div class="ttname"><a href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">asIScriptEngine::RegisterObjectMethod</a></div><div class="ttdeci">virtual int RegisterObjectMethod(const char *obj, const char *declaration, const asSFuncPtr &funcPointer, asDWORD callConv, void *auxiliary=0, int compositeOffset=0, bool isCompositeIndirect=false)=0</div><div class="ttdoc">Registers a method for the object type.</div></div>
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<div class="ttc" id="aangelscript_8h_html_a3ec92ea3c4762e44c2df788ceccdd1e4ac08652c72f1cc0dc81c37812fab0e253"><div class="ttname"><a href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4ac08652c72f1cc0dc81c37812fab0e253">asCALL_CDECL_OBJLAST</a></div><div class="ttdeci">@ asCALL_CDECL_OBJLAST</div><div class="ttdoc">A cdecl function that takes the object pointer as the last parameter.</div><div class="ttdef"><b>Definition:</b> angelscript.h:234</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="aangelscript_8h_html_a153aee5a6228913a469b6e6867e54efb"><div class="ttname"><a href="angelscript_8h.html#a153aee5a6228913a469b6e6867e54efb">asFUNCTIONPR</a></div><div class="ttdeci">#define asFUNCTIONPR(f, p, r)</div><div class="ttdoc">Returns an asSFuncPtr representing the function specified by the name, parameter list,...</div><div class="ttdef"><b>Definition:</b> angelscript.h:684</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="aangelscript_8h_html_a7345e6b3afabec24efd0ff77886d49a6"><div class="ttname"><a href="angelscript_8h.html#a7345e6b3afabec24efd0ff77886d49a6">asMETHOD</a></div><div class="ttdeci">#define asMETHOD(c, m)</div><div class="ttdoc">Returns an asSFuncPtr representing the class method specified by class and method name.</div><div class="ttdef"><b>Definition:</b> angelscript.h:740</div></div>
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<div class="ttc" id="aangelscript_8h_html_ac45ccb5854326cce38d721e2c00f1563"><div class="ttname"><a href="angelscript_8h.html#ac45ccb5854326cce38d721e2c00f1563">asMETHODPR</a></div><div class="ttdeci">#define asMETHODPR(c, m, p, r)</div><div class="ttdoc">Returns an asSFuncPtr representing the class method specified by class, method name,...</div><div class="ttdef"><b>Definition:</b> angelscript.h:742</div></div>
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<div class="ttc" id="aangelscript_8h_html_a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96"><div class="ttname"><a href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96">asCALL_THISCALL</a></div><div class="ttdeci">@ asCALL_THISCALL</div><div class="ttdoc">A thiscall class method.</div><div class="ttdef"><b>Definition:</b> angelscript.h:232</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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<div class="ttc" id="aangelscript_8h_html_a3ec92ea3c4762e44c2df788ceccdd1e4aa241a0c1deedaa2d55eb99a83829efad"><div class="ttname"><a href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aa241a0c1deedaa2d55eb99a83829efad">asCALL_THISCALL_ASGLOBAL</a></div><div class="ttdeci">@ asCALL_THISCALL_ASGLOBAL</div><div class="ttdoc">A thiscall class method registered as a global function.</div><div class="ttdef"><b>Definition:</b> angelscript.h:230</div></div>
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