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instantiating a template with a member function pointer

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[SVN r13042]
This commit is contained in:
Jens Maurer 2002-03-03 10:11:32 +00:00
parent d97529e059
commit 933a719686
1 changed files with 30 additions and 0 deletions
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borland_cpp.html
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@ -284,6 +284,36 @@ int main()
either taking a value or a reference parameter.
<h3>[instantiate memfun ptr] Instantiation with member function pointer</h3>
When directly instantiating a template with some member function
pointer, which is itself dependent on some template parameter, the
compiler cannot cope:
<pre>
template&lt;class U&gt; class C { };
template&lt;class T&gt;
class A
{
static const int v = C&lt;void (T::*)()&gt;::value;
};
</pre>
<strong>Workaround:</strong> Use an intermediate <code>typedef</code>:
<pre>
template&lt;class U&gt; class C { };
template&lt;class T&gt;
class A
{
typedef void (T::*my_type)();
static const int v = C&lt;my_type&gt;::value;
};
</pre>
(Extracted from e-mail exchange of David Abrahams, Fernando Cacciola,
and Peter Dimov; not actually tested.)
<h2>Library</h2>