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POC++ - calling methods from outside the class
 

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  1. POC++ - calling methods from outside the class
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    <p>I have couple questions regarding some C++ rules.</p> <ol> <li><p>Why am I able to call a function/method from outside the class in the namespace when I include the return type? (look at the namespace test2::testclass2 in the code below) i.e. this works:</p> <pre><code>bool b = testclass1::foo&lt;int&gt;(2); </code></pre> <p>whereas this doesn't: - (it doesn't even compile - compiler throws that this is function redeclaration)</p> <pre><code>testclass1::foo&lt;int&gt;(2); </code></pre> <p>C++ complains that it is a function redeclaration. Is that so?</p></li> <li><p>This line:</p> <pre><code>bool b = testclass1::foo&lt;int&gt;(2); </code></pre> <p>gets called first before anything else. Is this because static methods get created always first before anything else in C++?</p></li> <li><p>Where can I find those rules? I have a few C++ books at home, so if someone would be kind enough to either point out a book (and chapter or page) or direct me to a website I would greatly appreciate it.</p></li> </ol> <p>Here below is the sample (partial) code that I tested at home with Visual Studio 2008:</p> <pre><code>class testclass1 { public: testclass1(void); ~testclass1(void); template&lt;class A&gt; static bool foo(int i) { std::cout &lt;&lt;"in static foo"; return true; } }; namespace test2 { class testclass2 { public: testclass2(void); ~testclass2(void); }; bool b = testclass1::foo&lt;int&gt;(2); } </code></pre> <p>EDIT:</p> <p>A few people mentioned that I need to call this inside the function and this will work without any problem.<br> I understand that; the only reason I asked this question is because I saw this code somewhere (in someone's elses project) and was wondering how and why this works. Since I never really seen anyone doing it before.</p> <p>Also, this is used (in multiple places) as a way to call and instantiate a large number of classes like this via those function calls (that are outside). They get called first before anything else is instantiated. </p>
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