This function registers an expression function defined by a plugin, so that users can use it in expressions. All arguments are integer type.

bool _plugin_registerexprfunction(
    int pluginHandle,                //plugin handle
    const char* name,                //name of expresison function
    int argc,                        //number of arguments
    CBPLUGINEXPRFUNCTION cbFunction, //callback function
    void* userdata                   //user data


pluginHandle:Handle of the calling plugin.
name:Name of expresison function.
argc:Number of arguments of expression function.
cbFunction:Callback with the following typdef:
typedef duint(*CBPLUGINEXPRFUNCTION)(int argc, const duint* argv, void* userdata);
userdata:A pointer value passed to the callback, may be used by plugin to pass additional information.

Return Values

Return true when the registration is successful, otherwise return false.