98 lines
2.7 KiB
C++
98 lines
2.7 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_FIELD_IMPL_HPP
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#define BOOST_MYSQL_DETAIL_FIELD_IMPL_HPP
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#include <boost/mysql/bad_field_access.hpp>
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#include <boost/mysql/blob.hpp>
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#include <boost/mysql/date.hpp>
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#include <boost/mysql/datetime.hpp>
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#include <boost/mysql/field_kind.hpp>
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#include <boost/mysql/time.hpp>
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#include <boost/mp11/algorithm.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/variant2/variant.hpp>
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#include <string>
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#include <type_traits>
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namespace boost {
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namespace mysql {
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namespace detail {
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// Breaks a circular dependency between field_view and field
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struct field_impl
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{
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using null_t = boost::variant2::monostate;
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using variant_type = boost::variant2::variant<
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null_t, // Any of the below when the value is NULL
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std::int64_t, // signed TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT
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std::uint64_t, // unsigned TINYINT, SMALLINT, MEDIUMINT, INT, BIGINT, YEAR, BIT
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std::string, // CHAR, VARCHAR, TEXT (all sizes), , ENUM,
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// SET, DECIMAL
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blob, // BINARY, VARBINARY, BLOB (all sizes), GEOMETRY
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float, // FLOAT
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double, // DOUBLE
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date, // DATE
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datetime, // DATETIME, TIMESTAMP
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time // TIME
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>;
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variant_type data;
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field_impl() = default;
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template <typename... Args>
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field_impl(Args&&... args) noexcept(std::is_nothrow_constructible<variant_type, Args...>::value)
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: data(std::forward<Args>(args)...)
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{
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}
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field_kind kind() const noexcept { return static_cast<field_kind>(data.index()); }
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template <typename T>
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const T& as() const
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{
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const T* res = boost::variant2::get_if<T>(&data);
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if (!res)
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BOOST_THROW_EXCEPTION(bad_field_access());
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return *res;
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}
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template <typename T>
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T& as()
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{
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T* res = boost::variant2::get_if<T>(&data);
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if (!res)
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BOOST_THROW_EXCEPTION(bad_field_access());
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return *res;
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}
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template <typename T>
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const T& get() const noexcept
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{
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constexpr auto I = mp11::mp_find<variant_type, T>::value;
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return boost::variant2::unsafe_get<I>(data);
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}
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template <typename T>
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T& get() noexcept
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{
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constexpr auto I = mp11::mp_find<variant_type, T>::value;
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return boost::variant2::unsafe_get<I>(data);
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}
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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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#endif
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