xentara::utils::filesystem::StandardPathIterator Class Reference

An iterator that traverses all directories in a standard system search path. More...

#include <filesystem/StandardPathIterator.hpp>

Public Types
using	value_type = std::filesystem::path
	The value type.
using	difference_type = std::ptrdiff_t
	Dummy type for non-existend difference type.
using	pointer = const std::filesystem::path *
	A pointer to a value.
using	reference = const std::filesystem::path &
	A reference to a value.
using	iterator_concept = std::input_iterator_tag
	The iterator concept.
using	iterator_category = iterator_concept
	The iterator category, for use in pre-C++20 code.

Public Member Functions
constexpr	StandardPathIterator () noexcept=default
	Default constructor.
	StandardPathIterator (StandardPath type)
	Constructor for a certain type of search path.
constexpr	StandardPathIterator (std::default_sentinel_t) noexcept
	Constructor for a sentinel.
auto	operator== (const StandardPathIterator &rhs) const noexcept -> bool
	Equality operator.
auto	operator== (std::default_sentinel_t) const noexcept -> bool
	Comparison with a sentinel.
auto	operator* () const noexcept -> const std::filesystem::path &
	Accesses the current directory.
auto	operator-> () const noexcept -> const std::filesystem::path *
	Accesses the current directory.
auto	operator++ () -> StandardPathIterator &
	Fetches the next directory in the search path.

Related Symbols
(Note that these are not member symbols.)
auto	begin (StandardPathIterator iterator) -> StandardPathIterator
	Gets a begin iterator for a standard path iterator.
auto	end (StandardPathIterator) -> std::default_sentinel_t
	Gets an end iterator for a standard path iterator.

Detailed Description

An iterator that traverses all directories in a standard system search path.

This is an iterator object that can be used to iterate of all of the standard locations for a certain type of file. Standard path iterators are input iterators and can be used in algorithms that take an input iterator. Standard path iterators also supply freestanding [begin()](xentara::utils::windows::wmi::begin(StandardPathIterator)) and [end()](xentara::utils::windows::wmi::end(StandardPathIterator)) functions, so they can be used in range-based for loops:

auto iterateOverPaths(xentara::utils::filesystem::StandardPathIterator iterator) -> auto
{
    for (auto &&path : iterator)
    {
        ...
    }
}

Genarally, however, it is easier to use an xentara::utils::filesystem::StandardPath enum value in the for loop directly:

for (auto &&path : xentara::utils::filesystem::StandardPath::Data)
{
    ...
}

See also

StandardPath

Member Typedef Documentation

difference_type

using xentara::utils::filesystem::StandardPathIterator::difference_type = std::ptrdiff_t

Dummy type for non-existend difference type.

iterator_category

using xentara::utils::filesystem::StandardPathIterator::iterator_category = iterator_concept

The iterator category, for use in pre-C++20 code.

iterator_concept

using xentara::utils::filesystem::StandardPathIterator::iterator_concept = std::input_iterator_tag

The iterator concept.

pointer

using xentara::utils::filesystem::StandardPathIterator::pointer = const std::filesystem::path *

A pointer to a value.

reference

using xentara::utils::filesystem::StandardPathIterator::reference = const std::filesystem::path &

A reference to a value.

value_type

using xentara::utils::filesystem::StandardPathIterator::value_type = std::filesystem::path

The value type.

Constructor & Destructor Documentation

StandardPathIterator() [1/3]

constexpr xentara::utils::filesystem::StandardPathIterator::StandardPathIterator ( )

constexprdefaultnoexcept

Default constructor.

This constructor constructs a dummy itertor that does not iterate over any files.

Default constructed iterator compare equal to exhaused iterator, so they can be used as sentinels in algorithms that require the iterator and sentinel to be of the same type.

StandardPathIterator() [2/3]

xentara::utils::filesystem::StandardPathIterator::StandardPathIterator

(

StandardPath

type

)

Constructor for a certain type of search path.

This constructor constructs an iterator pointing to the first directory in the given search path.

StandardPathIterator() [3/3]

constexpr xentara::utils::filesystem::StandardPathIterator::StandardPathIterator ( std::default_sentinel_t  )

constexprnoexcept

Constructor for a sentinel.

This constructor constructs an object that compares equal to exhaused iterators, so it can be used as a sentinel in algorithms that require the iterator and sentinel to be of the same type.

This constructor is identical to the default constructor.

Member Function Documentation

operator*()

auto xentara::utils::filesystem::StandardPathIterator::operator* ( ) const -> const std::filesystem::path &

noexcept

Accesses the current directory.

Precondition

Must not be called on an exhaused iterator

operator++()

auto xentara::utils::filesystem::StandardPathIterator::operator++

(

)

-> StandardPathIterator &

Fetches the next directory in the search path.

Precondition

Must not be called on an exhaused iterator

operator->()

auto xentara::utils::filesystem::StandardPathIterator::operator-> ( ) const -> const std::filesystem::path *

noexcept

Accesses the current directory.

Precondition

Must not be called on an exhaused iterator

operator==() [1/2]

auto xentara::utils::filesystem::StandardPathIterator::operator== ( const StandardPathIterator &  rhs ) const -> bool

noexcept

Equality operator.

A iterator only compares equal to itself, except exhaused iterators, that compare equal to all other exhaused iterators, including default constructed iterators. This allows using default constructed iterators as sentinels in algorithms that require the iterator and sentinel to be of the same type.

operator==() [2/2]

auto xentara::utils::filesystem::StandardPathIterator::operator== ( std::default_sentinel_t  ) const -> bool

noexcept

Comparison with a sentinel.

Returns

Returns true if the iterator is exhaused, or false if it contains a valid directory.

Friends And Related Symbol Documentation

begin()

auto begin ( StandardPathIterator  iterator ) -> StandardPathIterator

related

Gets a begin iterator for a standard path iterator.

This function enables the use of StandardPathIterator in range-based for loops

Parameters

iterator

The iterator to iterate over

Returns

Simply returns a copy of the iterator

end()

auto end ( StandardPathIterator  ) -> std::default_sentinel_t

related

Gets an end iterator for a standard path iterator.

This function enables the use of StandardPathIterator in range-based for loops

Returns

The global default sentinel