Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You could cast the member function pointer to the type you need:</p> <pre><code>mem_fun( static_cast&lt; R (DataStructure::*)( Args... ) &gt;( &amp;DataStructure::top ) ) </code></pre> <p>or</p> <pre><code>mem_fun( static_cast&lt; R (DataStructure::*)( Args... ) const &gt;( &amp;DataStructure::top ) ) </code></pre> <p>with appropriate <code>R</code> for the result type and <code>Args...</code> for the arguments.</p> <p><strong>EDIT:</strong> You made two (three) mistakes in your complete example:</p> <p>a) The cast needs to be exact, that is you need to provide the correct return type. Luckily, <code>std::stack</code> has typedefs to help you with that. In your case, you can cast with these two options:</p> <pre><code>typedef typename DataStructure::reference (DataStructure::*non_const_top)(); mem_fun( static_cast&lt; non_const_top &gt;( &amp;DataStructure::top ) ) </code></pre> <p>or</p> <pre><code>typedef typename DataStructure::const_reference (DataStructure::*const_top)() const; mem_fun( static_cast&lt; const_top &gt;( &amp;DataStructure::top ) ) </code></pre> <p>b) You tried to bind a temporary to a reference when calling <code>ts</code>. Together with a), change the code to:</p> <pre><code>DataStructure ds; typedef typename DataStructure::reference (DataStructure::*non_const_top)(); return ts(tree, value, ds, mem_fun(static_cast&lt;non_const_top&gt;(&amp;DataStructure::top))); </code></pre> <p>c) In <code>ts</code>, you try to call the <code>getter</code> without an object. You need to change it to:</p> <pre><code>auto const current = getter( &amp;ds ); </code></pre> <p>With these changes, the code works for me.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow can I solve this ambiguousity wrt. mem_fun?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USDaniel Frey
    1. USDaniel Frey
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow can I solve this ambiguousity wrt. mem_fun?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI added a full solution with your suggestion, at least as I understood it, doesn't work. The error is given in Nawaz' answer.
      singulars
      1. PO
      1. USprimfaktor
    2. COI edited the answer as it's way too much for a comment...
      singulars
      1. PO
      1. USDaniel Frey
    3. COThanks, I knew about *c*, should have put a comment there. But I never got that far.
      singulars
      1. PO
      1. USprimfaktor
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload