[Rcpp-devel] How to efficiently remove some words from a big vector of strings.

[Dirk Eddelbuettel]

Please keep follow-up questions on the list where I am replying to now. 

On 22 December 2013 at 15:20, contact AG STUDY wrote:
| Impressive!Thanks for this fast answer.
| 
| |  error: no matching function for call to 'remove_if(std::vector
| | <std::basic_string<char> >::iterator, std::vector<std::basic_string<char>
| | >::iterator, stripWords(std::vector<std::basic_string<char> >&, std::set
| | <std::basic_string<char> >&)::<lambda(const string&)>)'
| 
| You said : Try prefixing it with  std::  as you did with the things from the
| std
| namespace.
| 
| I am afraid to say , I don't understand what do you mean here? How can I fix
| it?

Instead of calling 

        remove_if( ... many arguments ... )

call

        std::remove_if( ... many arguments ... )

Dirk 
 
 
| On Sun, Dec 22, 2013 at 3:14 PM, Dirk Eddelbuettel <edd at debian.org> wrote:
| 
| 
|     On 22 December 2013 at 14:46, contact AG STUDY wrote:
|     | I am trying to write an efficient c++ function to remove some words from
|     a big
|     | vector of strings.
|     | Here my code using stl :
|     |
|     | vector<std::string> stripWords(vector<std::string>& input, 
|     |                   std::set<std::string>& toRemove){ 
|     | input.erase(
|     |      remove_if(input.begin(), input.end(), 
|     |                  [&toRemove](const std::string& x) -> bool {
|     |                      return toRemove.find(x) != toRemove.end
|     ();
|     |                  }),input.end());
|     | }
|     |
|     | But I get this warning about using lambda expression and this template
|     error.
|     |
|     |
|     |  warning: lambda expressions only available with -std=c++0x or -std=
|     gnu++0x
|     | [enabled by default]
| 
|     R is (by default) not configured to use C++11. We are slowly moving towards
|     getting that changed (ie see NEWS in the R-devel sources).
| 
|     For the time being you can either
| 
|      i)   for all R sessions, set the required option as an argument to
|     CXXFLAGS in
|           ~/.R/Makevars, or its system-wide equivalent, or another script
|     where
|           you set environment variables
| 
|      ii)  if you use Rcpp Attributes, use `[[Rcpp::plugins(cpp11)]]` and see
|           `help(pluginsAttribute)`  for details
| 
|      iii) for a package use src/Makevars or src/Makevars.win
| 
|     |  error: no matching function for call to 'remove_if(std::vector
|     | <std::basic_string<char> >::iterator, std::vector<std::basic_string<char>
|     | >::iterator, stripWords(std::vector<std::basic_string<char> >&, std::set
|     | <std::basic_string<char> >&)::<lambda(const string&)>)'
| 
|     Try prefixing it with  std::  as you did with the things from the std
|     namespace.
|    
|     Dirk
| 
|     --
|     Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com
| 
| 

-- 
Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com