96 lines
2.5 KiB
C++
96 lines
2.5 KiB
C++
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//
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// Copyright (c) 2019-2024 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_MYSQL_DETAIL_ROW_IMPL_HPP
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#define BOOST_MYSQL_DETAIL_ROW_IMPL_HPP
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#include <boost/mysql/field_view.hpp>
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#include <boost/mysql/detail/config.hpp>
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#include <boost/core/span.hpp>
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#include <cstddef>
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#include <vector>
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namespace boost {
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namespace mysql {
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namespace detail {
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// Adds num_fields default-constructed fields to the vector, return pointer to the first
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// allocated value. Used to allocate fields before deserialization
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inline span<field_view> add_fields(std::vector<field_view>& storage, std::size_t num_fields)
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{
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std::size_t old_size = storage.size();
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storage.resize(old_size + num_fields);
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return span<field_view>(storage.data() + old_size, num_fields);
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}
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// A field_view vector with strings pointing into a
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// single character buffer. Used to implement owning row types
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class row_impl
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{
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public:
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row_impl() = default;
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BOOST_MYSQL_DECL
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row_impl(const row_impl&);
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row_impl(row_impl&&) = default;
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BOOST_MYSQL_DECL
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row_impl& operator=(const row_impl&);
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row_impl& operator=(row_impl&&) = default;
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~row_impl() = default;
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// Copies the given span into *this
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BOOST_MYSQL_DECL
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row_impl(const field_view* fields, std::size_t size);
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// Copies the given span into *this, used by row/rows in assignment from view
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BOOST_MYSQL_DECL
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void assign(const field_view* fields, std::size_t size);
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// Adds new default constructed fields to provide storage to deserialization
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span<field_view> add_fields(std::size_t num_fields)
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{
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return ::boost::mysql::detail::add_fields(fields_, num_fields);
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}
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// Saves strings in the [first, first+num_fields) range into the string buffer, used by execute
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BOOST_MYSQL_DECL
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void copy_strings_as_offsets(std::size_t first, std::size_t num_fields);
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// Restores any offsets into string views, used by execute
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BOOST_MYSQL_DECL
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void offsets_to_string_views();
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const std::vector<field_view>& fields() const noexcept { return fields_; }
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void clear() noexcept
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{
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fields_.clear();
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string_buffer_.clear();
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}
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private:
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std::vector<field_view> fields_;
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std::vector<unsigned char> string_buffer_;
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};
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} // namespace detail
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} // namespace mysql
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} // namespace boost
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#ifdef BOOST_MYSQL_HEADER_ONLY
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#include <boost/mysql/impl/row_impl.ipp>
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#endif
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#endif
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