| 1 | // Copyright (c) 2023 Bela Schaum, X-Ryl669, Denis Mikhailov. |
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| 2 | // |
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| 3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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| 4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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| 5 | |
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| 6 | |
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| 7 | // Initial implementation by Bela Schaum, https://github.com/schaumb |
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| 8 | // The way to make it union and UB free by X-Ryl669, https://github.com/X-Ryl669 |
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| 9 | // |
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| 10 | |
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| 11 | #include <boost/pfr/config.hpp> |
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| 12 | |
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| 13 | #if BOOST_PFR_CORE_NAME_ENABLED && BOOST_PFR_USE_CPP17 |
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| 14 | //[pfr_example_get_name |
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| 15 | /*` |
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| 16 | Since C++20 it's possible to read name of a structure field by index using Boost.PFR library. |
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| 17 | The following example shows how to do it using [funcref boost::pfr::get_name]. |
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| 18 | |
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| 19 | Let's define some structure: |
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| 20 | */ |
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| 21 | #include <boost/pfr/core_name.hpp> |
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| 22 | |
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| 23 | struct foo { // defining structure |
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| 24 | int some_integer; |
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| 25 | char c; |
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| 26 | }; |
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| 27 | |
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| 28 | /*` |
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| 29 | We can access field's names of that structure by index: |
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| 30 | */ |
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| 31 | constexpr std::string_view n1 = boost::pfr::get_name<0, foo>(); // returns "some_integer" |
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| 32 | constexpr std::string_view n2 = boost::pfr::get_name<1, foo>(); // returns "c" |
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| 33 | //] [/pfr_example_get_name] |
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| 34 | #endif |
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| 35 | |
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| 36 | int main() { |
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| 37 | #if BOOST_PFR_CORE_NAME_ENABLED && BOOST_PFR_USE_CPP17 |
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| 38 | if (n1 != "some_integer" ) return 1; |
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| 39 | if (n2 != "c" ) return 2; |
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| 40 | #endif |
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| 41 | |
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| 42 | return 0; |
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| 43 | } |
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| 44 | |
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