boost/more
1
0
Fork 0
mirror of https://github.com/boostorg/more.git synced 2025-03-25 13:30:09 +08:00
Code Issues Packages Projects Releases Wiki Activity

instantiating a template with a member function pointer

Browse Source 
[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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
borland_cpp.html
View File

@ -284,6 +284,36 @@ int main()
either taking a value or a reference parameter. 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> <h2>Library</h2>