---
name: "__gnu_debug__Safe_sequence_base"
section: "3"
platform: "linux"
package: "libstdc++6-4.2-doc"
version: "4.2.4-6"
release: "Debian 5.0 (Lenny)"
platforms: ["linux"]
url: "https://new.carta.tech/__gnu_debug__Safe_sequence_base"
---

# \_\_gnu\_debug\_\_Safe\_sequence\_base(3)

## NAME

\_\_gnu\_debug::\_Safe\_sequence\_base -

## SYNOPSIS

Inherited by **\_\_gnu\_debug::\_Safe\_sequence\< \_Sequence \>**, **\_\_gnu\_debug::\_Safe\_sequence\< \_\_gnu\_cxx::\_\_debug::hash\_map\< \_Value, \_Tp, \_HashFcn, \_EqualKey, \_Alloc \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< \_\_gnu\_cxx::\_\_debug::hash\_multimap\< \_Value, \_Tp, \_HashFcn, \_EqualKey, \_Alloc \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< \_\_gnu\_cxx::\_\_debug::hash\_multiset\< \_Value, \_HashFcn, \_EqualKey, \_Alloc \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< \_\_gnu\_cxx::\_\_debug::hash\_set\< \_Value, \_HashFcn, \_EqualKey, \_Alloc \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< \_\_gnu\_debug::basic\_string\< \_CharT, \_Traits, \_Allocator \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< std::deque\< \_Tp, \_Allocator \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< std::list\< \_Tp, \_Allocator \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< std::map\< \_Key, \_Tp, \_Compare, \_Allocator \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< std::multimap\< \_Key, \_Tp, \_Compare, \_Allocator \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< std::multiset\< \_Key, \_Compare, \_Allocator \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< std::set\< \_Key, \_Compare, \_Allocator \> \>**, **\_\_gnu\_debug::\_Safe\_sequence\< std::vector\< \_Tp, \_Allocator \> \>**, and std::\_\_debug::bitset\< \_Nb \>.

## Detailed Description

The \_Safe\_sequence\_base class provides basic support for tracking iterators into a sequence. Sequences that track iterators must derived from \_Safe\_sequence\_base publicly, so that safe iterators (which inherit **\_Safe\_iterator\_base**) can attach to them. This class contains two linked lists of iterators, one for constant iterators and one for mutable iterators, and a version number that allows very fast invalidation of all iterators that reference the container.

This class must ensure that no operation on it may throw an exception, otherwise 'safe' sequences may fail to provide the exception-safety guarantees required by the C++ standard.

Definition at line 164 of file safe\_base.h.

### Public Member Functions

void **\_M\_invalidate\_all** () const \

### Public Attributes

**\_Safe\_iterator\_base** \* **\_M\_const\_iterators**\
 **\_Safe\_iterator\_base** \* **\_M\_iterators**\
 unsigned int **\_M\_version**\

### Protected Member Functions

void **\_M\_detach\_all** ()\
 void **\_M\_detach\_singular** ()\
 \_\_gnu\_cxx::\_\_mutex & **\_M\_get\_mutex** ()\
 void **\_M\_revalidate\_singular** ()\
 void **\_M\_swap** (**\_Safe\_sequence\_base** &\_\_x)\
 **~\_Safe\_sequence\_base** ()\

## Constructor & Destructor Documentation

### \_\_gnu\_debug::\_Safe\_sequence\_base::~\_Safe\_sequence\_base ()` [inline, protected]`

Notify all iterators that reference this sequence that the sequence is being destroyed.

Definition at line 184 of file safe\_base.h.

References \_M\_detach\_all().

## Member Function Documentation

### void \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_detach\_all ()` [protected]`

Detach all iterators, leaving them singular.

Referenced by ~\_Safe\_sequence\_base().

### void \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_detach\_singular ()` [protected]`

Detach all singular iterators.

**Postcondition:**

for all iterators i attached to this sequence, i-\>\_M\_version == \_M\_version.

### \_\_gnu\_cxx::\_\_mutex& \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_get\_mutex ()` [protected]`

For use in **\_Safe\_sequence**.

Referenced by \_\_gnu\_debug::\_Safe\_sequence\< \_Sequence \>::\_M\_invalidate\_if(), and \_\_gnu\_debug::\_Safe\_sequence\< \_Sequence \>::\_M\_transfer\_iter().

### void \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_invalidate\_all () const` [inline]`

Invalidates all iterators.

Definition at line 220 of file safe\_base.h.

References \_M\_version.

### void \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_revalidate\_singular ()` [protected]`

Revalidates all attached singular iterators. This method may be used to validate iterators that were invalidated before (but for some reasion, such as an exception, need to become valid again).

### void \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_swap (\_Safe\_sequence\_base & \_\_x)` [protected]`

Swap this sequence with the given sequence. This operation also swaps ownership of the iterators, so that when the operation is complete all iterators that originally referenced one container now reference the other container.

## Member Data Documentation

### \_Safe\_iterator\_base\* \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_const\_iterators

The list of constant iterators that reference this container.

Definition at line 171 of file safe\_base.h.

Referenced by \_\_gnu\_debug::\_Safe\_sequence\< \_Sequence \>::\_M\_invalidate\_if(), \_\_gnu\_debug::\_Safe\_iterator\< \_Iterator, \_Sequence \>::\_M\_invalidate\_single(), and \_\_gnu\_debug::\_Safe\_sequence\< \_Sequence \>::\_M\_transfer\_iter().

### \_Safe\_iterator\_base\* \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_iterators

The list of mutable iterators that reference this container.

Definition at line 168 of file safe\_base.h.

Referenced by \_\_gnu\_debug::\_Safe\_sequence\< \_Sequence \>::\_M\_invalidate\_if(), \_\_gnu\_debug::\_Safe\_iterator\< \_Iterator, \_Sequence \>::\_M\_invalidate\_single(), and \_\_gnu\_debug::\_Safe\_sequence\< \_Sequence \>::\_M\_transfer\_iter().

### unsigned int \_\_gnu\_debug::\_Safe\_sequence\_base::\_M\_version` [mutable]`

The container version number. This number may never be 0.

Definition at line 174 of file safe\_base.h.

Referenced by \_M\_invalidate\_all().

## Author

Generated automatically by Doxygen for libstdc++ from the source code.