Ranges
======

.. cpp:namespace:: hysj

Fold
----

:cpp:include:`#include<hysj/ranges/fold.hpp>`

Stolen from `P2322R0 <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2322r0.html>`_.

.. cpp:function:: unspecified ranges::fold(auto &&r,auto init,auto op,auto proj)

   | Fold range.
   |

Borrowable Filter
^^^^^^^^^^^^^^^^^

:cpp:include:`#include<hysj/ranges/borrowable_filter.hpp>`

Borrowable :cppref:`std::views::filter <ranges/filter_view>`.

.. cpp:function:: unspecified views::bfilter(auto &&d,auto p)

   |

Borrowable Transform
^^^^^^^^^^^^^^^^^^^^

:cpp:include:`#include<hysj/ranges/borrowable_transform.hpp>`

Borrowable :cppref:`std::views::transform <ranges/transform_view>`.

.. cpp:function:: unspecified views::btransform(auto &&d,auto &&f)
		  
   |
   
Borrowable Join
^^^^^^^^^^^^^^^

:cpp:include:`#include<hysj/ranges/borrowable_join.hpp>`

Borrowable :cppref:`std::views::join <ranges/join_view>`.

.. cpp:function:: unspecified views::bjoin(auto &&outer)

   |

Common Concat
-------------

:cpp:include:`#include<hysj/ranges/common_concat.hpp>`

.. cpp:function:: unspecified views::common_concat(auto &&...inner)

   | Concatenates a sequence of views of the same type. Propagates borrowability.
   | 

Enumerate
---------

:cpp:include:`#include<hysj/ranges/enumerate.hpp>`

Stolen from `P2164R1 <http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2164r4.pdf>`_.

Linear Span
-----------

:cpp:include:`#include<hysj/ranges/linear_span.hpp>`

Reversible and strideable :cppref:`std::span <container/span>`.

.. cpp:function:: unspecified views::span(auto &&range,auto stride,auto eetent)

   | Constructs a linear span.
   |

Utility
-------

:cpp:include:`#include<hysj/ranges/utility.hpp>`
     
.. cpp:var:: unspecified ranges::to_vector(auto range,auto projection)
	     unspecified ranges::to_map(auto range,auto projection)

   | Project :cpp:expr:`range` into :cppref:`std::vector <containers/vector>` or :cppref:`std::map <containers/map>`.
   |

.. cpp:function:: unspecified views::indices(std::integral auto N)
		  unspecified views::indices(std::ranges::range auto R)

   | Creates view of indices :math:`[0,N)`. 
   |

.. cpp:function:: unspecified views::one(x)

   | Analogue to :cppref:`std::views::all <ranges/all_view>` for single values. Creates a span for lvalue-references, and a :cppref:`std::views::single <ranges/single_view>` for rvalue-references.
   |