rows_view

A non-owning read-only reference to a sequence of rows.

Synopsis

Defined in header <boost/mysql/rows_view.hpp>

class rows_view

Types

Name	Description
const_iterator	A random access iterator to an element.
const_reference	The reference type.
difference_type	A signed integer type used to represent differences.
iterator	A random access iterator to an element.
reference	The reference type.
size_type	An unsigned integer type to represent sizes.
value_type	A type that can hold elements in this collection with value semantics.

Member Functions

Name	Description
at	Returns the i-th row or throws an exception.
back	Returns the last row.
begin	Returns an iterator to the first element in the collection.
empty	Returns true if there are no rows in the collection (i.e. `this->size() == 0`)
end	Returns an iterator to one-past-the-last element in the collection.
front	Returns the first row.
num_columns	Returns the number of elements each row in the collection has.
operator[]	Returns the i-th row (unchecked access).
operator==	Equality operator.
operator!=	Inequality operator.
rows_view [constructor]	Construct an empty (but valid) view.
size	Returns the number of rows in the collection.

Models a non-owning matrix-like container. Indexing a rows_view object (by using iterators, rows_view::at or rows_view::operator[]) returns a row_view object, representing a single row. All rows in the collection are the same size (as given by num_columns).

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:

If it was constructed from a rows object (by calling 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.
If it was obtained by calling connection::read_some_rows it's valid until the connection performs the next network call or is destroyed.

row_view's and 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.

Calling any member function on an invalid view results in undefined behavior.

Instances of this class are usually created by the library, not by the user.

Boost C++ Libraries

rows_view

Synopsis

Types

Member Functions

Description