Re: rtrimws: can't compile in g++

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From	Miles Bader <miles@gnu.org>
Newsgroups	comp.lang.c++
Subject	Re: rtrimws: can't compile in g++
Date	Thu, 07 Jul 2011 15:11:18 +0900
Organization	NEC Electronics
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eric <cneric12lin0@gmail.com> writes:
> --------------------
> 4-4.cpp: In function ‘void rtrimws(std::string&)’:
> 4-4.cpp:21:21: error: too many arguments to function ‘void
> rtrimws(std::string&)’
> 4-4.cpp:20:6: note: declared here
> ------------

The problem seems to be that there are multiple overloaded versions of
"isspace"[*], and the compiler doesn'tn know which one you want.

Changing the function that contains line 21 to the following seems to
make it work (though I dunno if it's the best solution):

   // Overloads to make cleaner calling for client code
   void rtrimws(string& s) {
     rtrimws (s, static_cast<int(&)(int)> (isspace));
   }

[I added the cast to "int(&)(int)" to force it to choose a particular
variant of isspace...]


[*] One is the usual "int isspace(int)", but there's _also_ this:

  template<typename _CharT>
    bool
    isspace(_CharT, const locale&);


-Miles

-- 
Acquaintance, n. A person whom we know well enough to borrow from, but not
well enough to lend to.

Thread

rtrimws: can't compile in g++ eric <cneric12lin0@gmail.com> - 2011-07-06 22:30 -0700
  Re: rtrimws: can't compile in g++ Miles Bader <miles@gnu.org> - 2011-07-07 15:11 +0900
    Re: rtrimws: can't compile in g++ eric <cneric12lin0@gmail.com> - 2011-07-06 23:26 -0700

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