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Returns the previous iterator in the sequence. [Note: prior has a number of overloaded meanings, depending on the type of its argument. For instance, if X is an Integral Constant, prior<X> returns an decremented Integral Constant of the same type. The following specification is iterator-specific. Please refer to the corresponding concept's documentation for the details of the alternative semantics — end note].
#include <boost/mpl/next_prior.hpp>
| Parameter | Requirement | Description | 
|---|---|---|
| Iterator | Bidirectional Iterator. | An iterator to decrement. | 
For any Bidirectional Iterators iter:
typedef prior<iter>::type j;
| Return type: | |
|---|---|
| Precondition: | iter is decrementable. | 
| Semantics: | j is an iterator pointing to the previous element in the sequence. If iter is a user-defined iterator, the library-provided default implementation is equivalent to typedef iter::prior j; | 
Amortized constant time.