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< a name = "range.style_guide" > < / a > < a class = "link" href = "style_guide.html" title = "Terminology and style guidelines" > Terminology and style guidelines< / a >
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< p >
The use of a consistent terminology is as important for < a class = "link" href = "concepts.html" title = "Range Concepts" > Ranges< / a >
and range-based algorithms as it is for iterators and iterator-based algorithms.
If a conventional set of names are adopted, we can avoid misunderstandings
and write generic function prototypes that are < span class = "bold" > < strong > < span class = "emphasis" > < em > self-documenting< / em > < / span > < / strong > < / span > .
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< p >
Since ranges are characterized by a specific underlying iterator type, we get
a type of range for each type of iterator. Hence we can speak of the following
types of ranges:
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< span class = "bold" > < strong > < span class = "emphasis" > < em > Value access< / em > < / span > < / strong > < / span > category:
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< div class = "itemizedlist" > < ul class = "itemizedlist" type = "circle" >
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< li class = "listitem" >
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Readable Range
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Writeable Range
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Swappable Range
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Lvalue Range
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< / li >
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< span class = "bold" > < strong > < span class = "emphasis" > < em > Traversal< / em > < / span > < / strong > < / span > category:
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< a class = "link" href = "concepts/single_pass_range.html" title = "Single Pass Range" > Single Pass Range< / a >
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< a class = "link" href = "concepts/forward_range.html" title = "Forward Range" > Forward Range< / a >
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< li class = "listitem" >
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< a class = "link" href = "concepts/bidirectional_range.html" title = "Bidirectional Range" > Bidirectional Range< / a >
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< li class = "listitem" >
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< a class = "link" href = "concepts/random_access_range.html" title = "Random Access Range" > Random Access Range< / a >
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Notice how we have used the categories from the < a href = "../../../../../libs/iterator/doc/new-iter-concepts.html" target = "_top" > new
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style iterators< / a > .
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< p >
Notice that an iterator (and therefore an range) has one < span class = "bold" > < strong > < span class = "emphasis" > < em > traversal< / em > < / span > < / strong > < / span >
property and one or more properties from the < span class = "bold" > < strong > < span class = "emphasis" > < em > value
access< / em > < / span > < / strong > < / span > category. So in reality we will mostly talk about
mixtures such as
< / p >
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Random Access Readable Writeable Range
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< li class = "listitem" >
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Forward Lvalue Range
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< p >
By convention, we should always specify the < span class = "bold" > < strong > < span class = "emphasis" > < em > traversal< / em > < / span > < / strong > < / span >
property first as done above. This seems reasonable since there will only be
one < span class = "bold" > < strong > < span class = "emphasis" > < em > traversal< / em > < / span > < / strong > < / span > property,
but perhaps many < span class = "bold" > < strong > < span class = "emphasis" > < em > value access< / em > < / span > < / strong > < / span >
properties.
< / p >
< p >
It might, however, be reasonable to specify only one category if the other
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category does not matter. For example, the < a class = "link" href = "reference/utilities/iterator_range.html" title = "Class iterator_range" > < code class = "computeroutput" > < span class = "identifier" > iterator_range< / span > < / code > < / a > can be constructed
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from a Forward Range. This means that we do not care about what < span class = "bold" > < strong > < span class = "emphasis" > < em > value
access< / em > < / span > < / strong > < / span > properties the Range has. Similarly, a Readable
Range will be one that has the lowest possible < span class = "bold" > < strong > < span class = "emphasis" > < em > traversal< / em > < / span > < / strong > < / span >
property (Single Pass).
< / p >
< p >
As another example, consider how we specify the interface of < code class = "computeroutput" > < span class = "identifier" > std< / span > < span class = "special" > ::< / span > < span class = "identifier" > sort< / span > < span class = "special" > ()< / span > < / code > . Algorithms are usually more cumbersome to
specify the interface of since both < span class = "bold" > < strong > < span class = "emphasis" > < em > traversal< / em > < / span > < / strong > < / span >
and < span class = "bold" > < strong > < span class = "emphasis" > < em > value access< / em > < / span > < / strong > < / span > properties
must be exactly defined. The iterator-based version looks like this:
< / p >
< p >
< / p >
< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > RandomAccessTraversalReadableWritableIterator< / span > < span class = "special" > > < / span >
< span class = "keyword" > void< / span > < span class = "identifier" > sort< / span > < span class = "special" > (< / span > < span class = "identifier" > RandomAccessTraversalReadableWritableIterator< / span > < span class = "identifier" > first< / span > < span class = "special" > ,< / span >
< span class = "identifier" > RandomAccessTraversalReadableWritableIterator< / span > < span class = "identifier" > last< / span > < span class = "special" > );< / span >
< / pre >
< p >
< / p >
< p >
For ranges the interface becomes
< / p >
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< / p >
< pre class = "programlisting" > < span class = "keyword" > template< / span > < span class = "special" > < < / span > < span class = "keyword" > class< / span > < span class = "identifier" > RandomAccessReadableWritableRange< / span > < span class = "special" > > < / span >
< span class = "keyword" > void< / span > < span class = "identifier" > sort< / span > < span class = "special" > (< / span > < span class = "identifier" > RandomAccessReadableWritableRange< / span > < span class = "special" > & < / span > < span class = "identifier" > r< / span > < span class = "special" > );< / span >
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< td align = "right" > < div class = "copyright-footer" > Copyright © 2003 -2010 Thorsten Ottosen, Neil Groves< p >
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at < a href = "http://www.boost.org/LICENSE_1_0.txt" target = "_top" > http://www.boost.org/LICENSE_1_0.txt< / a > )
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