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POTrying to understand RapidXml memory allocation
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  1. POTrying to understand RapidXml memory allocation
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    copied!<p>I'm using RapidXml in a c++ program. Well ok no problem it works. I just do not understand why I must use pointers instead of variable values... If you take a look to the RapidXml wiki page, some examples are provided, this is the one provided by RapidXml developers:</p> <pre><code>#include &lt;iostream&gt; #include &lt;string&gt; #include "rapidxml-1.13/rapidxml.hpp" #include "rapidxml-1.13/rapidxml_print.hpp" int main(int argc, char** argv); int main(int argc, char** argv) { using namespace rapidxml; xml_document&lt;&gt; doc; // xml declaration xml_node&lt;&gt;* decl = doc.allocate_node(node_declaration); decl-&gt;append_attribute(doc.allocate_attribute("version", "1.0")); decl-&gt;append_attribute(doc.allocate_attribute("encoding", "utf-8")); doc.append_node(decl); // root node xml_node&lt;&gt;* root = doc.allocate_node(node_element, "rootnode"); root-&gt;append_attribute(doc.allocate_attribute("version", "1.0")); root-&gt;append_attribute(doc.allocate_attribute("type", "example")); doc.append_node(root); // child node xml_node&lt;&gt;* child = doc.allocate_node(node_element, "childnode"); root-&gt;append_node(child); xml_node&lt;&gt;* child2 = doc.allocate_node(node_element, "childnode"); root-&gt;append_node(child2); std::string xml_as_string; // watch for name collisions here, print() is a very common function name! print(std::back_inserter(xml_as_string), doc); std::cout &lt;&lt; xml_as_string &lt;&lt; std::endl; // xml_as_string now contains the XML in string form, indented // (in all its angle bracket glory) std::string xml_no_indent; // print_no_indenting is the only flag that print() knows about print(std::back_inserter(xml_no_indent), doc, print_no_indenting); // xml_no_indent now contains non-indented XML std::cout &lt;&lt; xml_no_indent &lt;&lt; std::endl; } </code></pre> <p>Well, why does it use a pointer to xml_node???</p> <p>I ask this because I need to a function to return a xml_node...</p> <p>So if I do this:</p> <p>xml_node&lt;>* mynode = ... return *mynode;</p> <p>is it ok?? Because I want to use the returned node and all its children later. Is it good to do in this way? If not, how should I do?</p>
 

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