Ranges

Range and iterator tools, mostly backported from the standard library. More...

Classes
struct	iota_view< I >
	A very simple emulation of std::ranges::iota_view from C++20. More...
struct	mdcolex< T, D >
	A variation of mdspan with reversed indices (distinguished by ()). More...
struct	mdspan< T, D >
	A small, approximate subset of mdspan from C++23. More...
struct	span< T >
	A workalike for std::span from C++20 (only dynamic-extent, without ranges support). More...
struct	substring_view< R >
	A view of part of a range. More...
struct	transform_view< C, F >
	A very simple emulation of std::ranges::transform_view from C++20. More...

Functions
template<class R, class T = std::remove_reference_t<decltype(*std::begin(std::declval<R>()))>>
constexpr auto	binary_index (R &&r, const T &t)
	Find the index of a value in a sorted range.
template<class R, class A, class B>
bool	ckd_mul (R *result, A a, B b)
	A simple implementation of ckd_mul from C++26.
template<class R, class F>
constexpr auto	partition_point (R &&r, F &&f)
	A subset of std::ranges::partition_point from C++20.
template<class B, class R>
constexpr auto	permutation_view (B b, R r)
	A view of a (partial) permutation of a range.
template<class R>
constexpr auto	stride_view (R &&r, typename std::iterator_traits< decltype(std::begin(std::declval< R >()))>::difference_type n, decltype(n) o=0)
	A simple emulation of std::stride_view from C++23 for random-access underlying ranges.
template<class T>
auto	to_vector (span< T > s)
	Copy a span into a std::vector.
template<class S, class D, class F>
constexpr void	transform (S &&s, D d, F &&f)
	A simple subset of std::ranges::transform from C++20.

Detailed Description

Range and iterator tools, mostly backported from the standard library.

Function Documentation

to_vector()

template<class T>

auto to_vector

(

span< T >

s

)

Copy a span into a std::vector.

stride_view()

template<class R>

auto stride_view ( R && r, typename std::iterator_traits< decltype(std::begin(std::declval< R >()))>::difference_type n, decltype(n) o = 0 )

constexpr

A simple emulation of std::stride_view from C++23 for random-access underlying ranges.

Parameters

o	initial offset (not part of C++23)

transform()

template<class S, class D, class F>

void transform ( S && s, D d, F && f )

constexpr

A simple subset of std::ranges::transform from C++20.

This function is supported for GPU execution.

Parameters

s	source range
d	destination iterator

partition_point()

template<class R, class F>

auto partition_point ( R && r, F && f )

constexpr

A subset of std::ranges::partition_point from C++20.

This function is supported for GPU execution.

Parameters

r	random-access range

Returns

an iterator to the first element for which f returns false

binary_index()

template<class R, class T = std::remove_reference_t<decltype(*std::begin(std::declval<R>()))>>

auto binary_index ( R && r, const T & t )

constexpr

Find the index of a value in a sorted range.

This function is supported for GPU execution.

Parameters

r	random-access range

permutation_view()

template<class B, class R>

auto permutation_view ( B b, R r )

constexpr

A view of a (partial) permutation of a range.

Elements need not be sorted (though see also binary_index) and may be repeated (with caution for the resulting aliasing).

This function is supported for GPU execution.

Parameters

b	random-access starting iterator
r	range of offsets from b

Returns

view of selected elements, random access iff R is

ckd_mul()

template<class R, class A, class B>

bool ckd_mul	(	R *	result,
		A	a,
		B	b )

A simple implementation of ckd_mul from C++26.

Parameters

result	address to store the multiplication result
a	unsigned integer value
b	unsigned integer value

Returns

false if *result was assigned a valid multiplication result, true otherwise.