2004-11-28 03:35:12 +00:00
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2004-11-28 03:35:12 +00:00
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< title > The MPL Reference Manual: empty_sequence</ title >
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< table class = "header" >< tr class = "header" >< td class = "header-group navigation-bar" >< span class = "navigation-group" >< a href = "./views.html" class = "navigation-link" > Prev</ a > < a href = "./filter-view.html" class = "navigation-link" > Next</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" > Back < a href = "./filter-view.html" class = "navigation-link" > Along</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./views.html" class = "navigation-link" > Up</ a > < a href = "../refmanual.html" class = "navigation-link" > Home</ a ></ span >< span class = "navigation-group-separator" > | </ span >< span class = "navigation-group" >< a href = "./refmanual_toc.html" class = "navigation-link" > Full TOC</ a ></ span ></ td >
< td class = "header-group page-location" >< a href = "../refmanual.html" class = "navigation-link" > Front Page</ a > / < a href = "./sequences.html" class = "navigation-link" > Sequences</ a > / < a href = "./views.html" class = "navigation-link" > Views</ a > / < a href = "./empty-sequence.html" class = "navigation-link" > empty_sequence</ a ></ td >
</ tr ></ table >< div class = "header-separator" ></ div >
< div class = "section" id = "empty-sequence" >
< h1 >< a class = "toc-backref" href = "./views.html#id345" name = "empty-sequence" > empty_sequence</ a ></ h1 >
< div class = "section" id = "empty-synopsis" >
< h3 >< a class = "subsection-title" href = "#synopsis" name = "synopsis" > Synopsis</ a ></ h3 >
< pre class = "literal-block" >
struct < a href = "./empty-sequence.html" class = "identifier" > empty_sequence</ a >
{
// < em > unspecified</ em >
// < em > ...</ em >
};
</ pre >
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< div class = "section" id = "empty-description" >
< h3 >< a class = "subsection-title" href = "#description" name = "description" > Description</ a ></ h3 >
< p > Represents a sequence containing no elements.</ p >
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< h3 >< a class = "subsection-title" href = "#header" name = "header" > Header</ a ></ h3 >
< pre class = "literal-block" >
#include < < a href = "../../../../boost/mpl/empty_sequence.hpp" class = "header" > boost/mpl/empty_sequence.hpp</ a > >
</ pre >
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< div class = "section" id = "empty-expression-semantics" >
< h3 >< a class = "subsection-title" href = "#expression-semantics" name = "expression-semantics" > Expression semantics</ a ></ h3 >
< p > The semantics of an expression are defined only
where they differ from, or are not defined in < a class = "reference" href = "./random-access-sequence.html" > Random Access Sequence</ a > .</ p >
< p > In the following table, < tt class = "literal" >< span class = "pre" > s</ span ></ tt > is an instance of < tt class = "literal" >< span class = "pre" >< a href = "./empty-sequence.html" class = "identifier" > empty_sequence</ a ></ span ></ tt > .</ p >
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< col width = "66%" />
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< thead valign = "bottom" >
< tr >< th > Expression</ th >
< th > Semantics</ th >
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< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./empty-sequence.html" class = "identifier" > empty_sequence</ a ></ span ></ tt ></ td >
< td > An empty < a class = "reference" href = "./random-access-sequence.html" > Random Access Sequence</ a > .</ td >
</ tr >
< tr >< td >< tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s> ::type</ span ></ tt ></ td >
< td >< tt class = "literal" >< span class = "pre" >< a href = "./size.html" class = "identifier" > size</ a > < s> ::value</ span > < span class = "pre" > ==</ span > < span class = "pre" > 0</ span ></ tt > ; see < a class = "reference" href = "./random-access-sequence.html" > Random Access Sequence</ a > .</ td >
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< div class = "section" id = "empty-example" >
< h3 >< a class = "subsection-title" href = "#example" name = "example" > Example</ a ></ h3 >
< pre class = "literal-block" >
typedef < a href = "./begin.html" class = "identifier" > begin</ a > < < a href = "./empty-sequence.html" class = "identifier" > empty_sequence</ a > > ::type first;
typedef < a href = "./end.html" class = "identifier" > end</ a > < < a href = "./empty-sequence.html" class = "identifier" > empty_sequence</ a > > ::type last;
< a href = "./assert.html" class = "identifier" > BOOST_MPL_ASSERT</ a > (( is_same< first,last> ));
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./size.html" class = "identifier" > size</ a > < < a href = "./empty-sequence.html" class = "identifier" > empty_sequence</ a > > ::value, ==, 0 );
typedef < a href = "./transform-view.html" class = "identifier" > transform_view</ a > <
< a href = "./empty-sequence.html" class = "identifier" > empty_sequence</ a >
, add_pointer< _>
> empty_view;
< a href = "./assert-relation.html" class = "identifier" > BOOST_MPL_ASSERT_RELATION</ a > ( < a href = "./size.html" class = "identifier" > size</ a > < < a href = "./empty-sequence.html" class = "identifier" > empty_sequence</ a > > ::value, ==, 0 );
</ pre >
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< div class = "section" id = "empty-see-also" >
< h3 >< a class = "subsection-title" href = "#see-also" name = "see-also" > See also</ a ></ h3 >
< p >< a class = "reference" href = "./sequences.html" > Sequences</ a > , < a class = "reference" href = "./views.html" > Views</ a > , < a class = "refentry reference" href = "./vector.html" >< tt class = "refentry literal" >< span class = "pre" > vector</ span ></ tt ></ a > , < a class = "refentry reference" href = "./list.html" >< tt class = "refentry literal" >< span class = "pre" > list</ span ></ tt ></ a > , < a class = "refentry reference" href = "./single-view.html" >< tt class = "refentry literal" >< span class = "pre" > single_view</ span ></ tt ></ a ></ p >
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