29:I[49813,["/_next/static/chunks/3z--bwudlglfp.js","/_next/static/chunks/2u04xn-9yg2co.js","/_next/static/chunks/1b5-8ftwqgmtb.js","/_next/static/chunks/3nqo6bdos11l6.js","/_next/static/chunks/0fz0mlrjifmq7.js","/_next/static/chunks/2l43yyot7shmw.js","/_next/static/chunks/29v1ttach42xh.js","/_next/static/chunks/2ziic7alkvd8r.js","/_next/static/chunks/1hplpmn3-d0tx.js"],"CodeWorkspace"] 2a:T125d,/** * Copyright (c) 2011-2026 libbitcoin developers * * This file is part of libbitcoin. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . */ #ifndef LIBBITCOIN_SYSTEM_DATA_EXTERNAL_PTR_HPP #define LIBBITCOIN_SYSTEM_DATA_EXTERNAL_PTR_HPP #include namespace libbitcoin { namespace system { // Smart pointer of const T*, where T has an externally-guaranteed lifetime. // Copy/assignable, non-nullable, does not create/destroy its reference. // This models C const pointer with the exception of non-nullability. // The default value is T* to a static T{}, allowing deferred assignment. // The address of the default value remains consistent for a given type T. // The bool cast is false only if the pointer is initialized to default. // external_ptr{} models bitcoin value zero (data_chunk{}). template = true> class external_ptr { public: inline external_ptr() NOEXCEPT : pointer_(get_unassigned()) { } /// Defaults. inline external_ptr(external_ptr&&) = default; inline external_ptr(const external_ptr&) = default; inline external_ptr& operator=(external_ptr&&) = default; inline external_ptr& operator=(const external_ptr&) = default; inline ~external_ptr() = default; /// External ownership is required. inline external_ptr(Type&&) = delete; inline explicit external_ptr(const Type& instance) NOEXCEPT : external_ptr(&instance) { } inline external_ptr(const Type* pointer) NOEXCEPT : pointer_(is_null(pointer) ? get_unassigned() : pointer) { } inline external_ptr(const std::shared_ptr& shared) NOEXCEPT : pointer_(shared ? shared.get() : get_unassigned()) { } inline external_ptr& operator=(const std::shared_ptr& shared) { pointer_ = shared ? shared.get() : get_unassigned(); return *this; } inline operator bool() const NOEXCEPT { return pointer_ != get_unassigned(); } inline const Type& operator*() const NOEXCEPT { return *get(); } inline const Type* operator->() const NOEXCEPT { return get(); } inline const Type* operator[](size_t index) const NOEXCEPT { return std::next(get(), index); } inline const Type* get() const NOEXCEPT { return pointer_; } inline void reset() const NOEXCEPT { pointer_ = get_unassigned(); } private: const Type* pointer_{}; static inline const Type* get_unassigned() NOEXCEPT { static Type unassigned{}; return &unassigned; } }; template = true> inline bool operator==(const external_ptr& left, const external_ptr& right) NOEXCEPT { return *left == *right; } template = true> inline bool operator!=(const external_ptr& left, const external_ptr& right) NOEXCEPT { return !(left == right); } /// Form of external store required by make_external. template = true> using tether = std_vector>; /// Move instance to shared_ptr external ownership and return external_ptr. template = true> inline external_ptr make_external(Type&& instance, tether& external) NOEXCEPT { external.push_back(std::make_shared(std::forward(instance))); return { external.back().get() }; } /// Same as external_ptr{}. template = true> inline external_ptr make_external() NOEXCEPT { return {}; } /// Same as external_ptr{ pointer }. template = true> inline external_ptr make_external(const Type* pointer) NOEXCEPT { return { pointer }; } } // namespace system } // namespace libbitcoin #include #endif 12:["$","$L29",null,{"project":{"id":"cmuidb72x000001s1932ifphv","owner":"libbitcoin","repo":"libbitcoin-system","displayName":"libbitcoin/libbitcoin-system","defaultBranch":"master"},"commit":{"sha":"83147c18e3a80ab2949c2c8a7e3486950d7cfeff","message":"Merge pull request #2109 from evoskuil/master\n\nPerf/chain parse allocations (cherry-picked from PR2090)","authorLogin":"evoskuil","authorName":"Eric 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