Rcpp Version 0.12.12
StringTransformer.h
Go to the documentation of this file.
1 // -*- mode: C++; c-indent-level: 4; c-basic-offset: 4; tab-width: 8 -*-
2 //
3 // clone.h: Rcpp R/C++ interface class library -- clone RObject's
4 //
5 // Copyright (C) 2010 - 2011 Dirk Eddelbuettel and Romain Francois
6 //
7 // This file is part of Rcpp.
8 //
9 // Rcpp is free software: you can redistribute it and/or modify it
10 // under the terms of the GNU General Public License as published by
11 // the Free Software Foundation, either version 2 of the License, or
12 // (at your option) any later version.
13 //
14 // Rcpp is distributed in the hope that it will be useful, but
15 // WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 // GNU General Public License for more details.
18 //
19 // You should have received a copy of the GNU General Public License
20 // along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
21 
22 #ifndef Rcpp__StringTransformer_h
23 #define Rcpp__StringTransformer_h
24 
25 #include <RcppCommon.h>
26 
27 namespace Rcpp{
28 
29  template <typename UnaryOperator>
30  class StringTransformer : public std::unary_function<const char*, const char*>{
31  public:
32  StringTransformer( const UnaryOperator& op_ ): op(op_), buffer(){}
34 
35  const char* operator()(const char* input ) {
36  buffer = input ;
37  std::transform( buffer.begin(), buffer.end(), buffer.begin(), op ) ;
38  return buffer.c_str() ;
39  }
40 
41  private:
42  const UnaryOperator& op ;
43  std::string buffer ;
44  } ;
45 
46  template <typename UnaryOperator>
48  return StringTransformer<UnaryOperator>( fun ) ;
49  }
50 
51 }
52 
53 #endif
StringTransformer< UnaryOperator > make_string_transformer(const UnaryOperator &fun)
const UnaryOperator & op
StringTransformer(const UnaryOperator &op_)
const char * operator()(const char *input)
Rcpp API.
Definition: algo.h:28