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std::tuple like methods for user defined types without any macro or boilerplate code
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boostorg/pfr
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This is a C++14 library for very basic reflection that gives you access to structure elements by index and provides otherstd::tuple like methods for user defined types without any macro or boilerplate code.
Boost.PFR is a part of theBoost C++ Libraries. 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 withoutboost:: namespace seePFR.
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Latest developer documentation
#include<iostream>#include<fstream>#include<string>#include"boost/pfr.hpp"structsome_person { std::string name;unsigned birth_year;};intmain(int argc,constchar* argv[]) { some_person val{"Edgar Allan Poe",1809}; std::cout << boost::pfr::get<0>(val)// No macro! <<" was born in" << boost::pfr::get<1>(val);// Works with any aggregate initializables!if (argc >1) { std::ofstreamofs(argv[1]); ofs <<boost::pfr::io(val);// File now contains: {"Edgar Allan Poe", 1809} }}
Outputs:
Edgar Allan Poe was born in 1809#include<iostream>#include"boost/pfr.hpp"structmy_struct {// no ostream operator defined!int i;char c;double d;};intmain() { my_struct s{100,'H',3.141593}; std::cout <<"my_struct has" << boost::pfr::tuple_size<my_struct>::value <<" fields:" <<boost::pfr::io(s) <<"\n";}
Outputs:
my_struct has 3 fields: {100, H, 3.14159}#include<iostream>#include"boost/pfr.hpp"structmy_struct {// no ostream operator defined! std::string s;int i;};intmain() { my_struct s{{"Das ist fantastisch!"},100}; std::cout <<"my_struct has" << boost::pfr::tuple_size<my_struct>::value <<" fields:" <<boost::pfr::io(s) <<"\n";}
Outputs:
my_struct has 2 fields: {"Das ist fantastisch!", 100}#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"boost/pfr/io.hpp"namespacex3= boost::spirit::x3;structast_employee {// No BOOST_FUSION_ADAPT_STRUCT definedint age; std::string forename; std::string surname;double salary;};autoconst quoted_string = x3::lexeme['"' >> +(x3::ascii::char_ -'"') >>'"'];x3::rule<classemployee, ast_employee>const employee ="employee";autoconst 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 << boost::pfr::io(emp) << std::endl;}
Outputs:
(34 Chip Douglas 2500)Distributed under theBoost Software License, Version 1.0.
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std::tuple like methods for user defined types without any macro or boilerplate code