update boost

linx64/include/boost/mysql/impl/internal/protocol/static_buffer.hpp

@@ -0,0 +1,46 @@
+//
+// Copyright (c) 2019-2023 Ruben Perez Hidalgo (rubenperez038 at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BOOST_MYSQL_IMPL_INTERNAL_PROTOCOL_STATIC_BUFFER_HPP
+#define BOOST_MYSQL_IMPL_INTERNAL_PROTOCOL_STATIC_BUFFER_HPP
+
+// A very simplified variable-length buffer with fixed max-size
+
+#include <boost/assert.hpp>
+#include <boost/core/span.hpp>
+
+#include <array>
+#include <cstring>
+
+namespace boost {
+namespace mysql {
+namespace detail {
+
+template <std::size_t max_size>
+class static_buffer
+{
+    std::array<std::uint8_t, max_size> buffer_{};
+    std::size_t size_{};
+
+public:
+    static_buffer() noexcept = default;
+    span<const std::uint8_t> to_span() const noexcept { return {buffer_.data(), size_}; }
+    void append(const void* data, std::size_t data_size) noexcept
+    {
+        std::size_t new_size = size_ + data_size;
+        BOOST_ASSERT(new_size <= max_size);
+        std::memcpy(buffer_.data() + size_, data, data_size);
+        size_ = new_size;
+    }
+    void clear() noexcept { size_ = 0; }
+};
+
+}  // namespace detail
+}  // namespace mysql
+}  // namespace boost
+
+#endif