DereferenceIterator< BaseIterator > Class Template Reference

#include <genesis/utils/containers/deref_iterator.hpp>

Inherits BaseIterator.

Detailed Description

template<class BaseIterator>
class genesis::utils::DereferenceIterator< BaseIterator >

Iterator class that exposes elements in a container of pointers.

This class can be used as an iterator into a container of pointers, in order to avoid double dereferencing of the elements:

std::vector<std::unique_ptr<T>> foo;
for( auto& it : foo ){
    auto const baz = (*it)->bar;
}

This is cumbersome. By using this class, the double dereferencing is not needed. See Tree class for an exemplary usage of this technique.

Inspired by https://jonasdevlieghere.com/containers-of-unique-pointers/

Definition at line 60 of file deref_iterator.hpp.

Public Member Functions
	DereferenceIterator (BaseIterator const &other)
reference	operator* () const
pointer	operator-> () const
reference	operator[] (difference_type n) const

Public Types
using	difference_type = typename BaseIterator::difference_type
using	pointer = value_type *
using	reference = value_type &
using	value_type = typename BaseIterator::value_type::element_type

Constructor & Destructor Documentation

DereferenceIterator()

DereferenceIterator ( BaseIterator const &  other )

inline

Definition at line 70 of file deref_iterator.hpp.

Member Function Documentation

operator*()

reference operator* ( ) const

inline

Definition at line 74 of file deref_iterator.hpp.

operator->()

pointer operator-> ( ) const

inline

Definition at line 79 of file deref_iterator.hpp.

operator[]()

reference operator[] ( difference_type  n ) const

inline

Definition at line 84 of file deref_iterator.hpp.

Member Typedef Documentation

difference_type

using difference_type = typename BaseIterator::difference_type

Definition at line 65 of file deref_iterator.hpp.

pointer

using pointer = value_type *

Definition at line 67 of file deref_iterator.hpp.

reference

using reference = value_type &

Definition at line 68 of file deref_iterator.hpp.

value_type

using value_type = typename BaseIterator::value_type::element_type

Definition at line 64 of file deref_iterator.hpp.

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The documentation for this class was generated from the following file:

• deref_iterator.hpp