Databases
StackOverflow2013
Postsdbo
POIs there a warning free template function to convert basic types to string
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POIs there a warning free template function to convert basic types to string
    primarykey
    data
    text
    <p>I want to provide a templated function that converts most basic types to string. The best I have come up with so far is the following:</p> <pre><code>template&lt;typename T&gt; inline std::string anyToString(const T&amp; var) { std::ostringstream o; o &lt;&lt; var; return o.str(); } </code></pre> <p>The function can e.g. be used for the following:</p> <pre><code> class TimeError:public std::runtime_error{ public: explicit TimeError(int time):std::runtime_error(anyToString(time)), mTime(time){}; protected: int mTime; }; </code></pre> <p>The problem with anyToString and similar functions is the generation of ambiguity warnings when compiling with gcc version 4.4.3 -Wall -Wexta -Werror <code>"ISO C++ says that these are ambiguous, even though the worst conversion for the first is better than the worst conversion for the second</code>"</p> <p>To my knowledge the reason for the warning lies in the implicit conversion possibilities when calling &lt;&lt;. </p> <p>Those ambiguities are mainly generated by other templates as the following: </p> <pre><code> template&lt;typename T&gt; T&amp; operator&lt;&lt;(T&amp; out, const SymRad&amp; angle){ return out &lt;&lt; angle.deg(); } </code></pre> <p>But those have other advantages like working for several stream types. So I would like to keep them. If I turn the second template into a plain method for e.g. ostream the ambiguity is cleaned, but I'm looking for sth. that allows keeping both templates. Is there a generic function that does provide the same simplicity without generating warnings using the described options ? If not, what is the best way to <strong>locally</strong> disable the issued warning ?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMartin
    1. USMartin
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POIs there a warning free template function to convert basic types to string
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POIs there a warning free template function to convert basic types to string
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POIs there a warning free template function to convert basic types to string
      1. This table or related slice is empty.
      1. VTUpMod
    1. COHmm. Can you add an example of how you're using this template?
      singulars
      1. POIs there a warning free template function to convert basic types to string
      1. USOliver Charlesworth
    2. CO@Oli Charlesworth: added an example for the usage
      singulars
      1. POIs there a warning free template function to convert basic types to string
      1. USMartin
    3. CO@Martin, what options are you talking about when you say "those options"?
      singulars
      1. POIs there a warning free template function to convert basic types to string
      1. USRob Kennedy
 

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