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POWhere are the function address literals in c++?
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  1. POWhere are the function address literals in c++?
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    copied!<p><strong>UPDATE:</strong> After some additional reading, what I really wanted was guaranteed early binding (which should translated to an immediate call for non-virtual functions and non-PIC code), which can be done by passing a (member) function as a template parameter. The problem I had was that gcc &lt; 4.5 and icc 11.1 can generate some funky instructions for member function pointer template parameter calls. AFAICT, gcc >= 4,5 and vs2008 handle these template parameter calls fine.</p> <p>First of all, maybe <em>literals</em> is not the right term for this concept, but its the closest I could think of (not literals in the sense of functions as first class citizens).</p> <p>The idea is that when you make a conventional function call, it compiles to something like this:</p> <pre><code>callq &lt;immediate address&gt; </code></pre> <p>But if you make a function call using a function pointer, it compiles to something like this:</p> <pre><code>mov &lt;memory location&gt;,%rax callq *%rax </code></pre> <p>Which is all well and good. However, what if I'm writing a template library that requires a callback of some sort with a specified argument list and the user of the library is expected to know what function they want to call at <em>compile time</em>? Then I would like to write my template to accept a <strong>function literal as a template parameter.</strong> So, similar to </p> <pre><code>template &lt;int int_literal&gt; struct my_template {...};` </code></pre> <p>I'd like to write </p> <pre><code>template &lt;func_literal_t func_literal&gt; struct my_template {...}; </code></pre> <p>and have calls to func_literal within my_template compile to <code>callq &lt;immediate address&gt;</code>.</p> <p>Is there a facility in C++ for this, or a work around to achieve the same effect? If not, why not (e.g. some cataclysmic side effects)? How about C++0x or another language?</p>
 

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