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23 lines
925 B
C
23 lines
925 B
C
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// Copyright (c) 2021 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_UTIL_OVERLOADED_H
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#define BITCOIN_UTIL_OVERLOADED_H
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namespace util {
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//! Overloaded helper for std::visit. This helper and std::visit in general are
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//! useful to write code that switches on a variant type. Unlike if/else-if and
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//! switch/case statements, std::visit will trigger compile errors if there are
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//! unhandled cases.
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//!
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//! Implementation comes from and example usage can be found at
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//! https://en.cppreference.com/w/cpp/utility/variant/visit#Example
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template<class... Ts> struct Overloaded : Ts... { using Ts::operator()...; };
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//! Explicit deduction guide (not needed as of C++20)
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template<class... Ts> Overloaded(Ts...) -> Overloaded<Ts...>;
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} // namespace util
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#endif // BITCOIN_UTIL_OVERLOADED_H
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