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POMeaning of class(*)() in gcc
 

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    <p>I'm having trouble understanding this compiler error. I wrote class(*)() in the post title because the class I am instantiating is called "opaque", but that name is not informative or relevant. It is a templatized Circular Buffer and some tests. I am using the opaque class to test the data structure with full class/struct types. I am also testing with primitives (int at the moment) and that test function does not give me this compiler error. There is more code than this, but I've provided what I think are the relevant sections. The full code is <a href="https://gist.github.com/3196485" rel="nofollow">here</a> if you are interested. </p> <p>gcc error:</p> <pre><code>tests.cpp: In function ‘bool opaque_fill_test(int)’: tests.cpp:97:23: error: no matching function for call to ‘CircBuf&lt;opaque&gt;::remove(opaque (*)())’ </code></pre> <p>tests.cpp:</p> <pre><code>struct opaque { int id; opaque(int n): id(n) {} opaque operator=(const opaque &amp;o) { this-&gt;id = o.id; } }; opaque rcv(); CircBuf&lt;opaque&gt; c(size); for (int i=0; i&lt;size; i++) { if ( c.remove(&amp;rcv)) { if (rcv.id != i ) { cout &lt;&lt; "wrong value: " &lt;&lt; rcv &lt;&lt; " " &lt;&lt; "should be: " &lt;&lt; i &lt;&lt; endl; return false; } } else { cout &lt;&lt; "remove fail at i=" &lt;&lt; rcv &lt;&lt; endl; return false; } } </code></pre> <p>CircBuf.h:</p> <pre><code>template&lt;typename T&gt; class CircBuf { ... template&lt;typename T&gt; bool CircBuf&lt;T&gt;::remove(T *t) { ... *t = data[front]; ... </code></pre> <p>if i declare an opaque* and pass that to remove instead:</p> <pre><code>opaque rcv(); opaque* p = &amp;rcv; for (int i=0; i&lt;size; i++) { if ( c.remove(p)) { ... ... </code></pre> <p>i get a similar error:</p> <pre><code>tests.cpp: In function ‘bool opaque_fill_test(int)’: tests.cpp:96:16: error: cannot convert ‘opaque (*)()’ to ‘opaque*’ in initialization </code></pre>
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