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
|
#pragma once
#include <stddef.h> // for size_t
#include <string> // for string, basic_string
#include "cpp11/R.hpp" // for SEXP, SEXPREC, REAL_ELT, R_NilV...
#include "cpp11/attribute_proxy.hpp" // for attribute_proxy
#include "cpp11/protect.hpp" // for store
namespace cpp11 {
/// Converting to SEXP
class sexp {
private:
SEXP data_ = R_NilValue;
SEXP preserve_token_ = R_NilValue;
public:
sexp() = default;
sexp(SEXP data) : data_(data), preserve_token_(detail::store::insert(data_)) {}
// We maintain our own new `preserve_token_`
sexp(const sexp& rhs) {
data_ = rhs.data_;
preserve_token_ = detail::store::insert(data_);
}
// We take ownership over the `rhs.preserve_token_`.
// Importantly we clear it in the `rhs` so it can't release the object upon destruction.
sexp(sexp&& rhs) {
data_ = rhs.data_;
preserve_token_ = rhs.preserve_token_;
rhs.data_ = R_NilValue;
rhs.preserve_token_ = R_NilValue;
}
sexp& operator=(const sexp& rhs) {
detail::store::release(preserve_token_);
data_ = rhs.data_;
preserve_token_ = detail::store::insert(data_);
return *this;
}
~sexp() { detail::store::release(preserve_token_); }
attribute_proxy<sexp> attr(const char* name) const {
return attribute_proxy<sexp>(*this, name);
}
attribute_proxy<sexp> attr(const std::string& name) const {
return attribute_proxy<sexp>(*this, name.c_str());
}
attribute_proxy<sexp> attr(SEXP name) const {
return attribute_proxy<sexp>(*this, name);
}
attribute_proxy<sexp> names() const {
return attribute_proxy<sexp>(*this, R_NamesSymbol);
}
operator SEXP() const { return data_; }
SEXP data() const { return data_; }
/// DEPRECATED: Do not use this, it will be removed soon.
operator double() const { return REAL_ELT(data_, 0); }
/// DEPRECATED: Do not use this, it will be removed soon.
operator size_t() const { return REAL_ELT(data_, 0); }
/// DEPRECATED: Do not use this, it will be removed soon.
operator bool() const { return LOGICAL_ELT(data_, 0); }
};
} // namespace cpp11
|
