Open Babel: OBMolAtomBFSIter Class Reference

Public Member Functions

# OBMolAtomBFSIter Class Reference

Iterate over all atoms in an OBMol in a breadth-first search (BFS) More...

`#include <openbabel/obiter.h>`

List of all members.

## Public Member Functions
| OBMolAtomBFSIter ()
| OBMolAtomBFSIter (OBMol *mol, int StartIndex=1)
| OBMolAtomBFSIter (OBMol &mol, int StartIndex=1)
| OBMolAtomBFSIter (const OBMolAtomBFSIter &ai)
| ~OBMolAtomBFSIter ()
OBMolAtomBFSIter & | operator= (const OBMolAtomBFSIter &ai)
| operator bool () const
OBMolAtomBFSIter & | operator++ ()
OBMolAtomBFSIter | operator++ (int)
OBAtom * | operator-> () const
OBAtom & | operator* () const
int | CurrentDepth () const

## Detailed Description

Iterate over all atoms in an OBMol in a breadth-first search (BFS)

Since:
  version 2.1

To facilitate iteration through all atoms in a molecule, without resorting to atom indexes (which will change in the future), a variety of iterator methods are provided.

This class provides a breadth-first search ordering of atoms. When one connected component is exhausted, the iterator will start at another until all atoms are visited. No guarantee is made as to the ordering of iteration through connected components.

The iterator maintains an internal queue and list of visited atoms. As such it may not be appropriate for memory-constrained situations when iterating through large molecules.

Use of this iterator has been made significantly easier by a series of macros in the obiter.h header file:

          \#define FOR_BFS_OF_MOL(a,m)     for( OBMolAtomBFSIter     a(m); a; ++a )

Here is an example:

          #include <openbabel/obiter.h>
          #include <openbabel/mol.h>

          OBMol mol;
          FOR_BFS_OF_MOL(a, mol)
          {
             // The variable a behaves like OBAtom* when used with -> and * but
             // but needs to be explicitly converted when appearing as a parameter
             // in a function call - use &*a

          }

## Constructor & Destructor Documentation

OBMolAtomBFSIter | ( | ) | `[inline]`

OBMolAtomBFSIter | ( | OBMol * | mol,
|  | int | StartIndex = `1`
| ) |  |

OBMolAtomBFSIter | ( | OBMol & | mol,
|  | int | StartIndex = `1`
| ) |  |

OBMolAtomBFSIter | ( | const OBMolAtomBFSIter & | ai ) |

~OBMolAtomBFSIter | ( | ) | `[inline]`

## Member Function Documentation

OBMolAtomBFSIter & operator= | ( | const OBMolAtomBFSIter & | ai ) |

operator bool | ( | ) | const`[inline]`

Returns:
  Whether the iterator can still advance (i.e., visit more atoms)

OBMolAtomBFSIter & operator++ | ( | ) |

Preincrement -- advance to the next atom in the BFS list and return.

Referenced by OBMolAtomBFSIter::operator++().

OBMolAtomBFSIter operator++ | ( | int | ) |

Postincrement -- return the current atom and advance to the next atom.

OBAtom* operator-> | ( | ) | const`[inline]`

Returns:
  a pointer to the current atom

OBAtom& operator* | ( | ) | const`[inline]`

Returns:
  a reference to the current atom

int CurrentDepth | ( | ) | const

Returns:
  the current depth of the iterator

Since:
  version 2.2

The documentation for this class was generated from the following files:

- obiter.h
- obiter.cpp

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