...one of the most highly
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— Herb Sutter and Andrei
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Front Page / Sequences / Intrinsic Metafunctions / back |
Returns the last element in the sequence.
#include <boost/mpl/back.hpp>
Parameter | Requirement | Description |
---|---|---|
Sequence | Bidirectional Sequence | A sequence to be examined. |
For any Bidirectional Sequence s:
typedef back<s>::type t;
Return type: | A type. |
---|---|
Precondition: | empty<s>::value == false. |
Semantics: | Equivalent to typedef deref< prior< end<s>::type >::type >::type t; |
Amortized constant time.
typedef range_c<int,0,1> range1; typedef range_c<int,0,10> range2; typedef range_c<int,-10,0> range3; BOOST_MPL_ASSERT_RELATION( back<range1>::value, ==, 0 ); BOOST_MPL_ASSERT_RELATION( back<range2>::value, ==, 9 ); BOOST_MPL_ASSERT_RELATION( back<range3>::value, ==, -1 );