1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
// Copyright (C) 2013 Romain Francois
//
// This file is part of Rcpp.
//
// Rcpp is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// Rcpp is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Rcpp. If not, see <http://www.gnu.org/licenses/>.
#ifndef Rcpp_proxy_NamesProxy_h
#define Rcpp_proxy_NamesProxy_h
namespace Rcpp{
template <typename CLASS>
class NamesProxyPolicy{
public:
class NamesProxy : public GenericProxy<NamesProxy> {
public:
NamesProxy( CLASS& v) : parent(v){} ;
/* lvalue uses */
NamesProxy& operator=(const NamesProxy& rhs) {
if( this != &rhs) set( rhs.get() ) ;
return *this ;
}
template <typename T>
NamesProxy& operator=(const T& rhs);
template <typename T> operator T() const;
private:
CLASS& parent;
SEXP get() const {
return RCPP_GET_NAMES(parent.get__()) ;
}
void set(SEXP x) {
Shield<SEXP> safe_x(x);
/* check if we can use a fast version */
if( TYPEOF(x) == STRSXP && parent.size() == Rf_length(x) ){
Rf_namesgets(parent, x);
} else {
/* use the slower and more flexible version (callback to R) */
SEXP namesSym = Rf_install( "names<-" );
Shield<SEXP> call(Rf_lang3(namesSym, parent, x));
Shield<SEXP> new_vec(Rcpp_fast_eval(call, R_GlobalEnv));
parent.set__(new_vec);
}
}
} ;
class const_NamesProxy : public GenericProxy<const_NamesProxy>{
public:
const_NamesProxy( const CLASS& v) : parent(v){} ;
template <typename T> operator T() const;
private:
const CLASS& parent;
SEXP get() const {
return RCPP_GET_NAMES(parent.get__()) ;
}
} ;
NamesProxy names() {
return NamesProxy( static_cast<CLASS&>(*this) ) ;
}
const_NamesProxy names() const {
return const_NamesProxy(static_cast<const CLASS&>(*this) ) ;
}
} ;
}
#endif
|
