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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
|
# [PFR](https://apolukhin.github.io/pfr_non_boost/)
This is a C++14 library for very basic reflection that gives you access to structure elements by index and provides other `std::tuple` like methods for user defined types without any macro or boilerplate code.
[Boost.PFR](https://boost.org/libs/pfr) is a part of the [Boost C++ Libraries](https://github.com/boostorg). However, Boost.PFR is a header only library that does not depend on Boost. You can just copy the content of the "include" folder from the github into your project, and the library will work fine.
For a version of the library without `boost::` namespace see [PFR](https://github.com/apolukhin/pfr_non_boost).
### Test results
Branches | Build | Tests coverage | More info
----------------|-------------- | -------------- |-----------
Develop: | [](https://github.com/boostorg/pfr/actions/workflows/ci.yml) [](https://ci.appveyor.com/project/apolukhin/pfr/branch/develop) | [](https://coveralls.io/github/apolukhin/magic_get?branch=develop) | [details...](https://www.boost.org/development/tests/develop/developer/pfr.html)
Master: | [](https://github.com/boostorg/pfr/actions/workflows/ci.yml) [](https://ci.appveyor.com/project/apolukhin/pfr/branch/master) | [](https://coveralls.io/github/apolukhin/magic_get?branch=master) | [details...](https://www.boost.org/development/tests/master/developer/pfr.html)
[Latest developer documentation](https://www.boost.org/doc/libs/develop/doc/html/boost_pfr.html)
### Motivating Example #0
```c++
#include <iostream>
#include <fstream>
#include <string>
#include "pfr.hpp"
struct some_person {
std::string name;
unsigned birth_year;
};
int main(int argc, const char* argv[]) {
some_person val{"Edgar Allan Poe", 1809};
std::cout << pfr::get<0>(val) // No macro!
<< " was born in " << pfr::get<1>(val); // Works with any aggregate initializables!
if (argc > 1) {
std::ofstream ofs(argv[1]);
ofs << pfr::io(val); // File now contains: {"Edgar Allan Poe", 1809}
}
}
```
Outputs:
```
Edgar Allan Poe was born in 1809
```
[Run the above sample](https://godbolt.org/z/PfYsWKb7v)
### Motivating Example #1
```c++
#include <iostream>
#include "pfr.hpp"
struct my_struct { // no ostream operator defined!
int i;
char c;
double d;
};
int main() {
my_struct s{100, 'H', 3.141593};
std::cout << "my_struct has " << pfr::tuple_size<my_struct>::value
<< " fields: " << pfr::io(s) << "\n";
}
```
Outputs:
```
my_struct has 3 fields: {100, H, 3.14159}
```
### Motivating Example #2
```c++
#include <iostream>
#include "pfr.hpp"
struct my_struct { // no ostream operator defined!
std::string s;
int i;
};
int main() {
my_struct s{{"Das ist fantastisch!"}, 100};
std::cout << "my_struct has " << pfr::tuple_size<my_struct>::value
<< " fields: " << pfr::io(s) << "\n";
}
```
Outputs:
```
my_struct has 2 fields: {"Das ist fantastisch!", 100}
```
### Motivating Example #3
```c++
#include <iostream>
#include <string>
#include <boost/config/warning_disable.hpp>
#include <boost/spirit/home/x3.hpp>
#include <boost/fusion/include/adapt_boost_pfr.hpp>
#include "pfr/io.hpp"
namespace x3 = boost::spirit::x3;
struct ast_employee { // No BOOST_FUSION_ADAPT_STRUCT defined
int age;
std::string forename;
std::string surname;
double salary;
};
auto const quoted_string = x3::lexeme['"' >> +(x3::ascii::char_ - '"') >> '"'];
x3::rule<class employee, ast_employee> const employee = "employee";
auto const employee_def =
x3::lit("employee")
>> '{'
>> x3::int_ >> ','
>> quoted_string >> ','
>> quoted_string >> ','
>> x3::double_
>> '}'
;
BOOST_SPIRIT_DEFINE(employee);
int main() {
std::string str = R"(employee{34, "Chip", "Douglas", 2500.00})";
ast_employee emp;
x3::phrase_parse(str.begin(),
str.end(),
employee,
x3::ascii::space,
emp);
std::cout << pfr::io(emp) << std::endl;
}
```
Outputs:
```
(34 Chip Douglas 2500)
```
### Requirements and Limitations
[See docs](https://www.boost.org/doc/libs/develop/doc/html/boost_pfr.html).
### License
Distributed under the [Boost Software License, Version 1.0](https://boost.org/LICENSE_1_0.txt).
|
