Hi!<br><br>Why do you need an enable_if if you exactly know the type T? In that case you can use the temmplate specialization.<br><br>template&lt;&gt;<br>void f(const std::string&amp;, bool) {...}<br><br>template&lt;&gt;<br>

void f(const std::string&amp;, foo) {...}<br><br>template&lt;typename T&gt;<br>
void f(const std::string&amp;, typename enable_if&lt;boost::is_enum&lt;T&gt;, T&gt;::type t) {...}<br><br><br><div class="gmail_quote">On Sat, May 23, 2009 at 7:19 AM, Zachary Turner <span dir="ltr">&lt;<a href="mailto:divisortheory@gmail.com">divisortheory@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Suppose I have a template function <br><br>template&lt;typename T&gt; void f(const std::string&amp;, T);<br>
<br>which I want there to be a couple of different variants of.  <br><br>Version 1 - Enabled if and only if boost::is_same&lt;T, bool&gt;<br>
Version 2 - Enabled if and only if boost::is_same&lt;T, foo&gt;  (foo is a class)<br>Version 3 - Enabled if and only if boost::is_enum&lt;T&gt;<br>Version 4 - Otherwise<br><br>Is there an easy way to express this?  It seems I run into a bunch of overload ambiguity problems.  I&#39;m sure I can get around this by adding to every version the negation of all the other conditions, but this seems unnecessarily complicated.<br>

<br>_______________________________________________<br>
Boost-users mailing list<br>
<a href="mailto:Boost-users@lists.boost.org">Boost-users@lists.boost.org</a><br>
<a href="http://lists.boost.org/mailman/listinfo.cgi/boost-users" target="_blank">http://lists.boost.org/mailman/listinfo.cgi/boost-users</a><br></blockquote></div><br>