Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Moves an iterator 1 position backwards.
template<
typename I
>
typename result_of::prior<I>::type prior(I const& i);
Table 1.3. Parameters
|
Parameter |
Requirement |
Description |
|---|---|---|
|
|
Model of Bidirectional Iterator |
Operation's argument |
prior(i);
Return type: A model of the same iterator
concept as i.
Semantics: Returns an iterator to the
element prior to i.
#include <boost/fusion/iterator/prior.hpp> #include <boost/fusion/include/prior.hpp>
typedefvector<int,int> vec; vec v(1,2); assert(deref(next(begin(v))) == 2); assert(deref(prior(next(begin(v)))) == 1);