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1ab017bbfe
Internal parts of the zero-copy view (#5295), under detail/view and not included by json.hpp, so that users of json.hpp compile nothing of it: - macro_scope.hpp/macro_unscope.hpp: the few macros the view needs, under its own prefix (json.hpp undefines its own at its end); the throw macro honors JSON_NOEXCEPTION and JSON_THROW_USER like JSON_THROW - string_ref.hpp: std::string_view from C++17 on, else a small stand-in - node.hpp: the 16-byte node of the index; its kinds are value_t values (checked by a static_assert) - document_data.hpp: the storage of a parsed document (node array, decode arena, owned input) - scan.hpp: string and digit scanning with unrolled checks at fixed offsets (after yyjson) and the library's SWAR and UTF-8 checks, independent of the byte order Signed-off-by: Niels Lohmann <mail@nlohmann.me>
112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
// __ _____ _____ _____
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// __| | __| | | | JSON for Modern C++
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// | | |__ | | | | | | version 3.12.0
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// |_____|_____|_____|_|___| https://github.com/nlohmann/json
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//
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// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
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// SPDX-License-Identifier: MIT
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#pragma once
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#include <algorithm> // min
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#include <cstddef> // size_t
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#include <cstring> // memcmp, strlen
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#include <string> // basic_string
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#include <nlohmann/json.hpp>
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#include <nlohmann/detail/view/macro_scope.hpp>
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#if NLOHMANN_VIEW_HAS_CPP_17
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#include <string_view> // string_view
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#endif
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#ifndef JSON_NO_IO
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#include <ostream> // ostream
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#endif
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NLOHMANN_JSON_NAMESPACE_BEGIN
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namespace detail
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{
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namespace view
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{
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#if NLOHMANN_VIEW_HAS_CPP_17
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using string_ref = std::string_view;
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#else
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/// minimal C++11 stand-in for std::string_view
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class string_ref
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{
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public:
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using size_type = std::size_t;
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using const_iterator = const char*;
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string_ref() noexcept = default;
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string_ref(const char* s) : m_data(s), m_size(std::strlen(s)) {} // NOLINT(google-explicit-constructor,hicpp-explicit-conversions)
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string_ref(const char* s, std::size_t n) noexcept : m_data(s), m_size(n) {}
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template<typename Traits, typename Alloc>
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string_ref(const std::basic_string<char, Traits, Alloc>& s) noexcept : m_data(s.data()), m_size(s.size()) {} // NOLINT(google-explicit-constructor,hicpp-explicit-conversions)
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const char* data() const noexcept
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{
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return m_data;
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}
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std::size_t size() const noexcept
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{
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return m_size;
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}
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std::size_t length() const noexcept
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{
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return m_size;
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}
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bool empty() const noexcept
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{
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return m_size == 0;
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}
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const char* begin() const noexcept
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{
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return m_data;
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}
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const char* end() const noexcept
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{
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return m_data + m_size;
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}
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char operator[](std::size_t i) const noexcept
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{
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return m_data[i];
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}
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template<typename Traits, typename Alloc>
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explicit operator std::basic_string<char, Traits, Alloc>() const
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{
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return std::basic_string<char, Traits, Alloc>(m_data, m_size);
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}
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friend bool operator==(string_ref a, string_ref b) noexcept
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{
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return a.m_size == b.m_size && (a.m_size == 0 || std::memcmp(a.m_data, b.m_data, a.m_size) == 0);
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}
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friend bool operator!=(string_ref a, string_ref b) noexcept
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{
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return !(a == b);
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}
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friend bool operator<(string_ref a, string_ref b) noexcept
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{
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const int c = std::memcmp(a.m_data, b.m_data, (std::min)(a.m_size, b.m_size));
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return c != 0 ? c < 0 : a.m_size < b.m_size;
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}
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#ifndef JSON_NO_IO
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friend std::ostream& operator<<(std::ostream& o, string_ref s)
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{
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return o.write(s.m_data, static_cast<std::streamsize>(s.m_size));
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}
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#endif
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private:
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const char* m_data = "";
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std::size_t m_size = 0;
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};
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#endif
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} // namespace view
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} // namespace detail
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NLOHMANN_JSON_NAMESPACE_END
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