# std::reverse_iterator<Iter>::reverse_iterator

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< cpp‎ | iterator‎ | reverse iterator

| (1) |
reverse_iterator(); |  | (until C++17)
constexpr reverse_iterator(); |  | (since C++17)
| (2) |
explicit reverse_iterator( iterator_type x ); |  | (until C++17)
constexpr explicit reverse_iterator( iterator_type x ); |  | (since C++17)
| (3) |
template< class U > reverse_iterator( const reverse_iterator<U>& other ); |  | (until C++17)
template< class U > constexpr reverse_iterator( const reverse_iterator<U>& other ); |  | (since C++17)

Constructs a new iterator adaptor.

1) Default constructor. The underlying iterator is value-initialized. Operations on the resulting iterator have defined behavior if and only if the corresponding operations on a value-initialized `Iter` also have defined behavior.
2) The underlying iterator is initialized with x.
3) The underlying iterator is initialized with that of other. This overload participates in overload resolution only if `U` is not the same type as `Iter` and std::convertible_to<const U&, Iter> is modeled (since C++20).

### Parameters

x | - | iterator to adapt
other | - | iterator adaptor to copy

### Example

| This section is incomplete Reason: no example

### Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR | Applied to | Behavior as published | Correct behavior
--- | --- | --- | ---
LWG 235 | C++98 | the effect of the default constructor was not specified | specified
LWG 1012 | C++98 | the underlying iterator was default-initialized | it is value-initialized
LWG 3435 | C++20 | the converting constructor from another `reverse_iterator` was not constrained | constrained

### See also

operator= | assigns another iterator adaptor (public member function)
make_reverse_iterator (C++14) | creates a std::reverse_iterator of type inferred from the argument (function template)

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