...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Returns the last element in the sequence.
template <typename Sequence> typenameresult_of::back
<Sequence>::type back(Sequence& seq); template <typename Sequence> typenameresult_of::back
<Sequence const>::type back(Sequence const& seq);
Parameter 
Requirement 
Description 


Model of Bidirectional Sequence 
The sequence we wish to investigate. 
back(seq);
Return type: Returns a reference to
the last element in the sequence seq
if seq
is mutable and
e =
o
, where e
is the last element in the sequence, is a valid expression. Else, returns
a type convertible to the last element in the sequence.
Precondition: empty
(seq) == false
Semantics: Returns the last element in the sequence.
#include <boost/fusion/sequence/intrinsic/back.hpp> #include <boost/fusion/include/back.hpp>
vector
<int, int, int> v(1, 2, 3);
assert(back(v) == 3);