View Template Library

concatenation_view<container, const_tag, iter_tag, base>


Category: adaptors	Component type: type

Description

The concatenation_view template represents individual objects that come from a flattening of a container of containers.

The properties of the order of elements are the same as those provided by the underlying container, as is the validity of more than one active iterators at any one time.

concatenation_views are mutable if and only if the const_tag template parameter is mutable_view_tag. Note that changing elements of the container may result in invalidated iterators and may change the size of the view. Thus, use mutable views only if you really know what you are doing.

A concatenation_view owns its referenced container, if its base template parameter is aggregated_ownership, it merely references its container, if the base template parameter is referenced_ownership.

This view is used as a last step to extract the elements for set_union_view, set_difference_view, set_intersection_view, and set_symmetrical_difference_view, where it flattens the output of equal_range_view.

Template parameters

Parameter	Description	Default
`container`	The view's container type: the type of container referenced by this view
`const_tag`	The view's const tag: either `const_view_tag` or `mutable_view_tag`	`const_view_tag`
`iterator_tag`	The view's directional iterator category	One of `container::value_type::iterator::category, container::iterator::category` and `bidirectional_iterator_tag`, whichever is the lessest.
`base`	The view's ownership type: the base class that determines if the view references or owns the container	`referenced_ownership`

Definition

Defined in the header concatenation_view.hpp.

Model of

Single Container View

Type requirements

Container satisfies	View satisfies
Container	Container [1]
Forward Container	Forward Container [1]

Members

Member	Where defined	Description
`value_type`	Container	The type T of the elements accessed through the view.
`domain_type`	Single View	The type of the referenced container.
`pointer`	Container	Pointer to T.
`reference`	Container	Reference to T.
`const_reference`	Container	Const reference to T.
`size_type`	Container	An unsigned integral type.
`difference_type`	Container	A signed integral type.
`iterator`	Container	Iterator used to iterate through the view.
`const_iterator`	Container	Const iterator used to iterate through the view.
`reverse_iterator`	Reversible Container	Iterator used to iterate backwards through the view.
`const_reverse_iterator`	Reversible Container	Const iterator used to iterate backwards through the view.
`iterator begin()`	Container	Returns an iterator pointing to the begin of the view.
`iterator end()`	Container	Returns an iterator pointing to the end of the view.
`const_iterator begin() const`	Container	Returns a const_iterator pointing to the begin of the view.
`const_iterator end() const`	Container	Returns a const_iterator pointing to the end of the view.
`reverse_iterator rbegin()`	Reversible Container	Valid for reversible container's only. Returns a `reverse_iterator` pointing to the beginning of the reversed view.
`reverse_iterator rend()`	Reversible Container	Valid for reversible container's only. Returns a `reverse_iterator` pointing to the end of the reversed view.
`const_reverse_iterator rbegin() const`	Reversible Container	Valid for reversible container's only. Returns a `const_reverse_iterator` pointing to the beginning of the reversed view.
`const_reverse_iterator rend() const`	Reversible Container	Valid for reversible container's only. Returns a `const_reverse_iterator` pointing to the end of the reversed view.
`size_type size() const`	Container	Returns the size of the view. [1]
`size_type max_size() const`	Container	Returns the largest possible size of the view.
`bool empty() const`	Container	true if the view's size is 0.
`concatenation_view()`	Default Constructible	Creates an empty view.
`concatenation_view(container_t&)`	Assignable	Creates a view of given container.
`void swap(concatenation_view&)`	Container	Swaps the two views. Iterators are invalidated by this operation. For referencing views, the containers themselves are not swapped.
`bool operator==(const concatenation_view&, const concatenation_view&)`	Forward Container	Tests two views for equality. This is a global function, not a member function. Views may be equal even if their referenced containers are not.
`bool operator<(const concatenation_view&, const concatenation_view&)`	Forward Container	Lexicographical comparison. This is a global function, not a member function.

Notes

[1] A concatenation_view satisfies all the requirements of container, except for size() and iterator increment/decrement not guaranteeing constant complexity.