---
name: "ACE_Message_Queue_Reverse_Iterator"
section: "3"
platform: "linux"
package: "libace-doc"
version: "5.0.7-4"
release: "Debian 2.2 (Potato)"
platforms: ["linux"]
url: "https://new.carta.tech/ACE_Message_Queue_Reverse_Iterator"
---

# ACE\_Message\_Queue\_Reverse\_Iterator(3)

Reverse Iterator for the ACE\_Message\_Queue.

## NAME

ACE\_Message\_Queue\_Reverse\_Iterator -  Reverse Iterator for the ACE\_Message\_Queue.

## SYNOPSIS

```
#include <ace/Message_Queue_T.h>
template<ACE_SYNCH_DECL>
class ACE_Message_Queue_Reverse_Iterator
{
  public:
    ACE_Message_Queue_Reverse_Iterator (
        ACE_Message_Queue <ACE_SYNCH_USE> &queue
        );
    int next (ACE_Message_Block *&entry);
    int done (void) const;
    int advance (void);
    void dump (void) const;
    ACE_ALLOC_HOOK_DECLARE;
  private:
    ACE_Message_Queue <ACE_SYNCH_USE> &queue_;
    ACE_Message_Block *curr_;
};
```

## Initialization method.

```
ACE_Message_Queue_Reverse_Iterator (
    ACE_Message_Queue <ACE_SYNCH_USE> &queue
    );
```

## Iteration methods.

```
int next (ACE_Message_Block *&entry);
```

Pass back the entry that hasn't been seen in the queue. Returns 0 when all items have been seen, else 1.

```
int done (void) const;
```

Returns 1 when all items have been seen, else 0.

```
int advance (void);
```

Move forward by one element in the queue.  Returns 0 when all the items in the set have been seen, else 1.

```
void dump (void) const;
```

Dump the state of an object.

```
ACE_ALLOC_HOOK_DECLARE;
```

Declare the dynamic allocation hooks.

## AUTHOR

Doug Schmidt

## LIBRARY

ace