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POUsage of const directive in C++ in general, in particular in Tiny XML Library:
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2013-10-24T01:17:34.247
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I'm an experienced developer in a few compiled OOP languages, particularly Object Pascal and C#. Have 'messed around' with C++ for years but recently started getting more serious about C++ development. Most of concepts in C++ are quite easy for me to grasp based on my experience with other languages. But one thing that I'm finding quite difficult is the ways in which the <code>const</code> directive is used and how it behaves in C++. In particular, at the moment I'm faced with this problem, using the <a href="http://www.grinninglizard.com/tinyxml/" rel="nofollow">TinyXML Library</a> in Netbeans C++ IDE, on an Ubuntu 12.04 machine and default mingW/G++ tool chain: I'm calling this function: <pre><code>TiXmlNode::TiXmlNode* FirstChild() </code></pre> In the TinyXML source there are two overloaded public versions of this function in class <code>TiXmlNode</code>: <pre><code>const TiXmlNode* FirstChild() const { return firstChild; } TiXmlNode* FirstChild() { return firstChild; } </code></pre> They are identical except for the const directive. I assumed that the version called would be dependent on how I declared the variable I was loading from the function, for example: <pre><code>const TiXmlNode* aNode = node->FirstChild(); </code></pre> Would call the const version of the function <pre><code>TiXmlNode* aNode = node->FirstChild(); </code></pre> Would call the second version, without const. But when I try to use the second form in my code, I get a compiler error: <blockquote> error: invalid conversion from ‘const TiXmlNode*’ to ‘TiXmlNode*’ [-fpermissive] </blockquote> Why is this happening? How do I use the version of the function without const? What am I missing here? More - where can I find a good summary of the usages of <code>const</code> directive in C++ 11.
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<c++><const><tinyxml>
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Usage of const directive in C++ in general, in particular in Tiny XML Library:
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