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