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// // Copyright (c) 2019-2025 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_ROWS_VIEW_HPP #define BOOST_MYSQL_ROWS_VIEW_HPP #include #include #include #include #include #include #include #include #include namespace boost { namespace mysql { /** * \brief A non-owning read-only reference to a sequence of rows. * \details * Models a non-owning matrix-like container. Indexing a `rows_view` object (by using iterators, * \ref rows_view::at or \ref rows_view::operator[]) returns a \ref row_view object, representing a * single row. All rows in the collection are the same size (as given by \ref num_columns). * \n * A `rows_view` object points to memory owned by an external entity (like `string_view` does). The * validity of a `rows_view` object depends on how it was obtained: * \n * \li If it was constructed from a \ref rows object (by calling \ref rows::operator rows_view()), * the view acts as a reference to the `rows`' allocated memory, and is valid as long as * references to that `rows` elements are valid. * \li If it was obtained by calling \ref connection::read_some_rows it's valid until the * `connection` performs the next network call or is destroyed. * \n * \ref row_view's and \ref field_view's obtained by using a `rows_view` object are valid as long as * the underlying storage that `*this` points to is valid. Destroying `*this` doesn't invalidate * such references. * \n * Calling any member function on an invalid view results in undefined behavior. * \n * Instances of this class are usually created by the library, not by the user. */ class rows_view { public: #ifdef BOOST_MYSQL_DOXYGEN /** * \brief A random access iterator to an element. * \details The exact type of the iterator is unspecified. */ using iterator = __see_below__; #else using iterator = detail::rows_iterator; #endif /// \copydoc iterator using const_iterator = iterator; /// A type that can hold elements in this collection with value semantics. using value_type = row; /// The reference type. using reference = row_view; /// \copydoc reference using const_reference = row_view; /// An unsigned integer type to represent sizes. using size_type = std::size_t; /// A signed integer type used to represent differences. using difference_type = std::ptrdiff_t; /** * \brief Construct an empty (but valid) view. * \par Exception safety * No-throw guarantee. */ rows_view() = default; /** * \brief Returns an iterator to the first element in the collection. * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ const_iterator begin() const noexcept { return iterator(fields_, num_columns_, 0); } /** * \brief Returns an iterator to one-past-the-last element in the collection. * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ const_iterator end() const noexcept { return iterator(fields_, num_columns_, size()); } /** * \brief Returns the i-th row or throws an exception. * \par Exception safety * Strong guranatee. Throws on invalid input. * \throws std::out_of_range `i >= this->size()` * * \par Complexity * Constant. */ row_view at(std::size_t i) const { if (i >= size()) BOOST_THROW_EXCEPTION(std::out_of_range("rows_view::at")); return detail::row_slice(fields_, num_columns_, i); } /** * \brief Returns the i-th row (unchecked access). * \par Preconditions * `i < this->size()` * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ row_view operator[](std::size_t i) const noexcept { BOOST_ASSERT(i < size()); return detail::row_slice(fields_, num_columns_, i); } /** * \brief Returns the first row. * \par Preconditions * `this->size() > 0` * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ row_view front() const noexcept { return (*this)[0]; } /** * \brief Returns the last row. * \par Preconditions * `this->size() > 0` * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ row_view back() const noexcept { return (*this)[size() - 1]; } /** * \brief Returns true if there are no rows in the collection (i.e. `this->size() == 0`) * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ bool empty() const noexcept { return num_fields_ == 0; } /** * \brief Returns the number of rows in the collection. * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ std::size_t size() const noexcept { return (num_columns_ == 0) ? 0 : (num_fields_ / num_columns_); } /** * \brief Returns the number of elements each row in the collection has. * \details For every \ref row_view object r obtained from this collection, * `r.size() == this->num_columns()`. * * \par Exception safety * No-throw guarantee. * * \par Complexity * Constant. */ std::size_t num_columns() const noexcept { return num_columns_; } /** * \brief Equality operator. * \details The containers are considered equal if they have the same number of rows and * they all compare equal, as defined by \ref row_view::operator==. * * \par Exception safety * No-throw guarantee. * * \par Complexity * Linear on `this->size() * this->num_columns()`. */ bool operator==(const rows_view& rhs) const noexcept { if (num_fields_ != rhs.num_fields_ || num_columns_ != rhs.num_columns_) return false; for (std::size_t i = 0; i < num_fields_; ++i) { if (fields_[i] != rhs.fields_[i]) return false; } return true; } /** * \brief Inequality operator. * * \par Exception safety * No-throw guarantee. * * \par Complexity * Linear on `this->size() * this->num_columns()`. */ inline bool operator!=(const rows_view& rhs) const noexcept { return !(*this == rhs); } private: const field_view* fields_{}; std::size_t num_fields_{}; std::size_t num_columns_{}; rows_view(const field_view* fields, std::size_t num_fields, std::size_t num_columns) noexcept : fields_(fields), num_fields_(num_fields), num_columns_(num_columns) { BOOST_ASSERT(fields != nullptr || num_fields == 0); // fields null => num_fields 0 BOOST_ASSERT(num_fields == 0 || num_columns != 0); // num_fields != 0 => num_columns != 0 BOOST_ASSERT(num_columns == 0 || (num_fields % num_columns == 0)); } #ifndef BOOST_MYSQL_DOXYGEN friend struct detail::access; friend class rows; #endif }; } // namespace mysql } // namespace boost #endif