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52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
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// Copyright (c) 2019 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_VECTOR_H
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#define BITCOIN_UTIL_VECTOR_H
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#include <initializer_list>
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#include <type_traits>
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#include <vector>
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/** Construct a vector with the specified elements.
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*
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* This is preferable over the list initializing constructor of std::vector:
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* - It automatically infers the element type from its arguments.
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* - If any arguments are rvalue references, they will be moved into the vector
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* (list initialization always copies).
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*/
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template<typename... Args>
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inline std::vector<typename std::common_type<Args...>::type> Vector(Args&&... args)
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{
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std::vector<typename std::common_type<Args...>::type> ret;
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ret.reserve(sizeof...(args));
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// The line below uses the trick from https://www.experts-exchange.com/articles/32502/None-recursive-variadic-templates-with-std-initializer-list.html
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(void)std::initializer_list<int>{(ret.emplace_back(std::forward<Args>(args)), 0)...};
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return ret;
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}
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/** Concatenate two vectors, moving elements. */
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template<typename V>
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inline V Cat(V v1, V&& v2)
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{
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v1.reserve(v1.size() + v2.size());
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for (auto& arg : v2) {
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v1.push_back(std::move(arg));
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}
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return v1;
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}
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/** Concatenate two vectors. */
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template<typename V>
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inline V Cat(V v1, const V& v2)
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{
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v1.reserve(v1.size() + v2.size());
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for (const auto& arg : v2) {
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v1.push_back(arg);
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}
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return v1;
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}
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#endif // BITCOIN_UTIL_VECTOR_H
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