Re: [Boost-users] Splitting string at whitespace

Subject: Re: [Boost-users] Splitting string at whitespace
From: Marshall Clow (mclow.lists_at_[hidden])
Date: 2014-06-17 05:49:49

On Jun 16, 2014, at 3:34 PM, Florian Lindner <mailinglists_at_[hidden]> wrote:

> Hello,
> 
> for some time now I've been trying to split a given string at whitespaces: 
> "A B C" -> "A", "B", "C". I want to use boost/algorithm/string
> 
> #include "boost/algorithm/string/split.hpp"
> #include "boost/algorithm/string/compare.hpp"
> 
> std::vector<std::string> tokenize(const std::string& text )
> {    
>  std::vector<std::string> tokens;
>  boost::algorithm::split(tokens, text, boost::algorithm::is_equal(" "));
>  return tokens;
> }
> 

That’s the wrong predicate to use;  use is_space instead.
     boost::algorithm::split(tokens, text, boost::algorithm::is_space());

is_equal takes two characters and says if they’re equal.
split wants to call the predicate with a single character and get a true/false back.

> but compilation on gcc 4.9.0 / boost 1.55.0 just gives:

[snip]

— Marshall