View Template Library

unique_view<Container, Equal_fn, Const_tag, Iter_tag, Base>


Category: adaptors	Component type: type

Description

The unique_view template is a tranform_view of a equal_range_view presenting the unique values of a container. The properties of any unique_view instance depend on the properties of the container template parameter. The interface of unique_view adapts itself [1] to the referenced container, Container provides a Container interface, a unique_view referencing Forward Containers provides a Forward Container interface while a Random Access Container provides a Random Access Conatiner interface.

The unique_view presents the unique values, depending on the equal_fn template parameter.

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.

A unique_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.

Template parameters

Parameter	Description	Default
`container`	The view's container type: the type of container referenced by this view
`equal_fn`	The view's comparison function. Compares the contents of two iterators for equality.	`std::equal_to<container::value_type>`
`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	`container::iterator::category or bidirectional_iterator_tag whichever is the lesser.`
`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 unique_view.hpp.

Model of

Single Container View

Type requirements

Members

Member	Where defined	Description
`value_type`	Container	The type `T` of the elements accessed through the container.
`domain_type`	Single View	The type of the referenced container.
`pointer`	Container	Pointer to `T`.
`reference`	Container	Container::reference
`const_reference`	Container	Contianer::const_reference
`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 a container.
`const_reverse_iterator`	Reversible Container	Const iterator used to iterate backwards through a container.
`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 container.
`reverse_iterator rend()`	Reversible Container	Valid for reversible container's only. Returns a `reverse_iterator` pointing to the end of the reversed container.
`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 container.
`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 container.
`size_type size() const`	Container	Returns the size of the view.
`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.
`unique_view()`	Default Constructible	Creates an empty view.
`unique_view(container_t&, const equal_fn_t& = std::equal_to)`	view	Creates a view of given container.
`void swap(unique_view&)`	Container	Swaps the two views. Iterators are invalidated by this operation. For referencing views, the containers themselves are not swapped.
`bool operator==(const unique_view&, const unique_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 unique_view&, const unique_view&)`	Forward Container	Lexicographical comparison. This is a global function, not a member function.

Notes

[1]