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< title > Forward Traversal Concept</ title >
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< h1 class = "title" > Forward Traversal Concept</ h1 >
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<!-- Copyright David Abrahams 2006. Distributed under the Boost -->
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< p > A class or built-in type < tt class = "docutils literal" >< span class = "pre" > X</ span ></ tt > models the < em > Forward Traversal</ em >
concept if, in addition to < tt class = "docutils literal" >< span class = "pre" > X</ span ></ tt > meeting the requirements of Default
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Constructible and Single Pass Iterator, the following expressions are
valid and respect the stated semantics.</ p >
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< tr >< th class = "head" colspan = "3" > Forward Traversal Iterator Requirements (in addition to Default Constructible and Single Pass Iterator)</ th >
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</ tr >
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< tr >< th class = "head" > Expression</ th >
< th class = "head" > Return Type</ th >
< th class = "head" > Assertion/Note</ th >
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</ tr >
</ thead >
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< tr >< td >< tt class = "docutils literal" >< span class = "pre" > X</ span > < span class = "pre" > u;</ span ></ tt ></ td >
< td >< tt class = "docutils literal" >< span class = "pre" > X& </ span ></ tt ></ td >
< td > note: < tt class = "docutils literal" >< span class = "pre" > u</ span ></ tt > may have a
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singular value.</ td >
</ tr >
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< tr >< td >< tt class = "docutils literal" >< span class = "pre" > ++r</ span ></ tt ></ td >
< td >< tt class = "docutils literal" >< span class = "pre" > X& </ span ></ tt ></ td >
< td >< tt class = "docutils literal" >< span class = "pre" > r</ span > < span class = "pre" > ==</ span > < span class = "pre" > s</ span ></ tt > and < tt class = "docutils literal" >< span class = "pre" > r</ span ></ tt > is
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dereferenceable implies
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< tt class = "docutils literal" >< span class = "pre" > ++r</ span > < span class = "pre" > ==</ span > < span class = "pre" > ++s.</ span ></ tt ></ td >
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</ tr >
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< tr >< td >< tt class = "docutils literal" >< span class = "pre" > iterator_traits< X> ::difference_type</ span ></ tt ></ td >
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< td > A signed integral type representing
the distance between iterators</ td >
< td > </ td >
</ tr >
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< tr >< td >< tt class = "docutils literal" >< span class = "pre" > iterator_traversal< X> ::type</ span ></ tt ></ td >
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< td > Convertible to
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< tt class = "docutils literal" >< span class = "pre" > forward_traversal_tag</ span ></ tt ></ td >
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< td > </ td >
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