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flattened2d

[tls.flattened2d]

The class template flattened2d is an adaptor that provides a flattened view of a container of containers.

// Defined in header <oneapi/tbb/enumerable_thread_specific.h>

namespace oneapi {
namespace tbb {

    template<typename Container>
    class flattened2d {
    public:
        // Basic types
        using size_type = /* implementation-defined */;
        using difference_type = /* implementation-defined */;
        using allocator_type = /* implementation-defined */;
        using value_type = /* implementation-defined */;
        using reference = /* implementation-defined */;
        using const_reference = /* implementation-defined */;
        using pointer = /* implementation-defined */;
        using const_pointer = /* implementation-defined */;

        using iterator = /* implementation-defined */;
        using const_iterator = /* implementation-defined */;

        explicit flattened2d( const Container& c );

        flattened2d( const Container& c,
                     typename Container::const_iterator first,
                     typename Container::const_iterator last );

        iterator begin();
        iterator end();
        const_iterator begin() const;
        const_iterator end() const;

        size_type size() const;
    };

    template <typename Container>
    flattened2d<Container> flatten2d(const Container &c);

    template <typename Container>
    flattened2d<Container> flatten2d(
        const Container &c,
        const typename Container::const_iterator first,
        const typename Container::const_iterator last);

} // namespace tbb
} // namespace oneapi

Requirements:

  • A Container type must meet the container requirements from the [container.requirements.general] ISO C++ section.

Iterating from begin() to end() visits all of the elements in the inner containers. The class template supports forward iterators only.

The utility function flatten2d creates a flattened2d object from a specified container.

Member functions

explicit flattened2d(const Container &c)

Constructs a flattened2d representing the sequence of elements in the inner containers contained by outer container c.

Safety: these operations must not be invoked concurrently on the same flattened2d.

flattened2d(const Container &c, typename Container::const_iterator first, typename Container::const_iterator last)

Constructs a flattened2d representing the sequence of elements in the inner containers in the half-open interval [first, last) of a container c.

Safety: these operations must not be invoked concurrently on the same flattened2d.

size_type size() const

Returns the sum of the sizes of the inner containers that are viewable in the flattened2d.

Safety: These operations may be invoked concurrently on the same flattened2d.

iterator begin()

Returns iterator pointing to the beginning of the set of local copies.

iterator end()

Returns iterator pointing to the end of the set of local copies.

const_iterator begin() const

Returns const_iterator pointing to the beginning of the set of local copies.

const_iterator end() const

Returns const_iterator pointing to the end of the set of local copies.

Non-member functions

template<typename Container>
flattened2d<Container> flatten2d(const Container &c, const typename Container::const_iterator b, const typename Container::const_iterator e)

Constructs and returns a flattened2d object that provides iterators that traverse the elements in the containers within the half-open range [b, e) of a container c.

template<typename Container>
flattened2d(const Container &c)

Constructs and returns a flattened2d that provides iterators that traverse the elements in all of the containers within a container c.

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