dxx::utils Namespace Reference

The main namespace of the dxx::utils module. More...

Namespaces
namespace	heap
	The namespace for heap-allocated replacements for some standard library classes.

Classes
struct	As
class	Defer
	Class for deferring operations until the end of lifetime. More...
class	FileDescriptor
	RAII file descriptor. Wraps an integer file descriptor and defers closing it to the desctructor. More...

Concepts
concept	pointer
	Concept over std::is_pointer_v.
concept	reference
	Concept over std::is_reference_v.
concept	const_vrp
	A const value, a pointer to const, or a reference to const.
concept	mut_vrp
	Inverse of const_vrp.
concept	is_a
	Checks if the type is an instance of a template.
concept	either_of
	Checks if a type is the same as at least one of the provided arguments.
concept	neither_of
	Checks if a type is neither of provided arguments.
concept	declares
	Checks if the type was used to declare a certain value.

Functions
template<typename Integer>
constexpr auto	range (const Integer &to)
	Python-like range function ([ 0, to )).
template<typename From, std::convertible_to< From > To>
constexpr auto	range (const From &from, const To &to)
	Python-like range function ([ from, to )).
template<typename From, std::convertible_to< From > To, std::convertible_to< From > Step>
constexpr auto	range (const From &from, const To &to, const Step &step)
	Python-like range function ([ from, to ) with step step).

Variables
template<typename T, typename... Ts>
constexpr std::optional< std::size_t >	find_type_in = FindTypeIn<0, T, Ts...>::value
	Find the type T in the list of types Ts, return its index if present, otherwise is std::nullopt.
template<template< typename... > typename Range>
constexpr As< Range >	as {}
	An adaptor-like shortcut to invoking an std::from_range constructor for a class template.

Detailed Description

The main namespace of the dxx::utils module.

Function Documentation

range() [1/3]

template<typename From, std::convertible_to< From > To>

auto dxx::utils::range ( const From & from, const To & to )

inlinenodiscardconstexprexport

Python-like range function ([ from, to )).

Returns

An appropriate std::views::iota view

range() [2/3]

template<typename From, std::convertible_to< From > To, std::convertible_to< From > Step>

auto dxx::utils::range ( const From & from, const To & to, const Step & step )

inlinenodiscardconstexprexport

Python-like range function ([ from, to ) with step step).

Returns

An std::views::iota range transformed to have step step

range() [3/3]

template<typename Integer>

auto dxx::utils::range ( const Integer & to )

inlinenodiscardconstexprexport

Python-like range function ([ 0, to )).

Returns

An appropriate std::views::iota view

Variable Documentation

as

template<template< typename... > typename Range>

As<Range> dxx::utils::as {}

inlineconstexprexport

An adaptor-like shortcut to invoking an std::from_range constructor for a class template.

Does not work with regular types - use std::ranges::to or the constructor directly

E.g

auto v = range(10) | as<std::vector>;

is the same as

std::vector v{ std::from_range, range(10) };

or

std::vector<int> v{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };