|  | reflex::Ranges< T > Class Template Reference updated Thu Jun 19 2025 by Robert van Engelen |

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reflex::Ranges< T > Class Template Reference

RE/flex Ranges template class. More...

`#include <ranges.h>`

Inheritance diagram for reflex::Ranges< T >:
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Collaboration diagram for reflex::Ranges< T >:
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## Public Types
typedef T | bound_type
| Type of the bounds. More...
typedef std::set< std::pair< T, T >, range_compare< T > > | container_type
| Synonym type defining the base class container std::set. More...
typedef container_type::value_type | value_type
| Synonym type defining the base class container std::set::value_type. More...
typedef container_type::key_compare | key_compare
| Synonym type defining the key/value comparison std::set::key_compare. More...
typedef container_type::value_compare | value_compare
typedef container_type::iterator | iterator
| Synonym type defining the base class container std::set::iterator. More...
typedef container_type::const_iterator | const_iterator
| Synonym type defining the base class container std::set::iterator. More...

## Public Member Functions
| Ranges ()
| Construct an empty range. More...
| Ranges (const value_type &r)
| Construct a copy of a range [lo,hi]. More...
| Ranges (const bound_type &lo, const bound_type &hi)
| Construct a range [lo,hi]. More...
| Ranges (const bound_type &val)
| Construct a singleton range [val,val]. More...
std::pair< iterator, bool > | insert (const value_type &r)
| Update ranges to include range [lo,hi] by merging overlapping ranges into one range. More...
std::pair< iterator, bool > | insert (const bound_type &lo, const bound_type &hi)
| Update ranges to include range [lo,hi] by merging overlapping ranges into one range. More...
std::pair< iterator, bool > | insert (const bound_type &val)
| Update ranges to include the range [val,val]. More...
const_iterator | find (const bound_type &lo, const bound_type &hi) const
| Find the first range [lo',hi'] that overlaps the given range [lo,hi], i.e. lo <= hi' and lo' <= hi. More...
const_iterator | find (const bound_type &val) const
| Find the range [lo',hi'] that includes the given value val, i.e. lo' <= val <= hi'. More...
Ranges & | operator|= (const Ranges &rs)
| Update ranges to insert the given range set, where this method has lower complexity than iterating insert() for each range in rs. More...
Ranges & | operator+= (const Ranges &rs)
| Update ranges to insert the ranges of the given range set, same as Ranges::operator|=(rs). More...
Ranges & | operator&= (const Ranges &rs)
| Update ranges to intersect the ranges with the given range set. More...
Ranges | operator| (const Ranges &rs) const
| Returns the union of two range sets. More...
Ranges | operator+ (const Ranges &rs) const
| Returns the union of two range sets, same as Ranges::operator|(rs). More...
Ranges | operator& (const Ranges &rs) const
| Returns the intersection of two range sets. More...
bool | operator< (const Ranges &rs) const
| True if this range set is lexicographically less than range set rs. More...
bool | operator> (const Ranges &rs) const
| True if this range set is lexicographically greater than range set rs. More...
bool | operator<= (const Ranges &rs) const
| True if this range set is lexicographically less or equal to range set rs. More...
bool | operator>= (const Ranges &rs) const
| True if this range set is lexicographically greater or equal to range set rs. More...
bool | any () const
| Return true if this set of ranges contains at least one range, i.e. is not empty. More...
bool | intersects (const Ranges &rs) const
| Return true if this set of ranges intersects with ranges rs, i.e. this set has at least one range [lo',hi'] that overlaps with a range [lo,hi] in rs such that lo <= hi' and lo' <= hi. More...
bool | contains (const Ranges &rs) const
| Return true if this set of ranges contains all ranges in rs, i.e. rs is a subset of this set which means that for each range [lo,hi] in rs, there is a range [lo',hi'] such that lo' <= lo and hi <= hi'. More...
bound_type | lo () const
| Return the lowest value in the set of ranges (the set cannot be empty) More...
bound_type | hi () const
| Return the highest value in the set of ranges (the set cannot be empty) More...

## Detailed Description

### template<typename T>
class reflex::Ranges< T >

RE/flex Ranges template class.

The `std::set` container is the base class of this Ranges class. Value ranges [lo,hi] are stored in the underlying `std::set` container as a pair of bounds `std::pair(lo, hi)`.

Ranges in the set are mutually disjoint (i.e. non-overlapping). This property is maintained by the `reflex::Ranges` methods.

The `Ranges::value_type` is `std::pair<bound_type,bound_type>` with `Ranges::bound_type` the template parameter type `T`.

The `reflexx::Ranges` class introduces several new methods in addition to the inherited `std::set` methods:

- `std::pair<iterator,bool> insert(const bound_type& lo, const bound_type& hi)` updates ranges to include the range [lo,hi]. Returns an iterator to the range that contains [lo,hi] and a flag indicating that ranges was updated (true) or if the new range was subsumed by current ranges (false).
- `std::pair<iterator,bool> insert(const bound_type& val)` updates ranges to include the value [val,val]. Returns an iterator to the range that contains val and a flag indicating that ranges was updated (true) or if the new range was subsumed by current ranges (false).
- `const_iterator find(const bound_type& lo, const bound_type& hi) const` searches for the first range that overlaps with [lo,hi]. Returns an iterator to the range found or the end iterator.
- `const_iterator find(const bound_type& val) const` searches for the range that includes the given value. Returns an iterator to the range found or the end iterator.
- `Ranges& operator|=(const Ranges& rs)` inserts ranges rs. Returns reference to this object.
- `Ranges& operator+=(const Ranges& rs)` same as above.
- `Ranges& operator&=(const Ranges& rs)` update ranges to intersect with ranges rs. Returns reference to this object.
- `Ranges operator|(const Ranges& rs) const` returns union of ranges.
- `Ranges operator+(const Ranges& rs) const` same as above.
- `Ranges operator&(const Ranges& rs) const` returns intersection of ranges.
- `bool any() const` returns true if this set of ranges contains at least one range, i.e. is not empty.
- `bool intersects(const Ranges& rs) const` returns true if this set of ranges intersects ranges rs, i.e. has at least one range that overlaps with ranges rs.
- `bool contains(const Ranges& rs) const` returns true if this set of ranges contains all ranges rs, i.e. ranges rs is a subset.
- `bound_type lo()` returns the lowest value in the set of ranges.
- `bound_type hi()` returns the highest value in the set of ranges.

Warning
  Using `std::set::insert()` instead of `Ranges::insert()` may result in overlapping ranges rather than merging ranges to produce disjoint non-overlapping ranges.

Example:

reflex::Ranges<float> intervals;
intervals.insert(1.0, 2.0); // insert 1.0..2.0
intervals.insert(2.0, 3.0); // insert 2.0..3.0
intervals.insert(-1.0, 0.0); // insert -1.0..0.0
std::cout << "Set of " << intervals.size() << " intervals:" << std::endl;
for (reflex::Ranges<float>::const_iterator i = intervals.begin(); i != intervals.end(); ++i)
std::cout << "[" << i->first << "," << i->second << "]" << std::endl;
if (intervals.find(2.5) != intervals.end())
std::cout << "2.5 is in intervals" << std::endl;
for (reflex::Ranges<float>::const_iterator i = intervals.find(0.0, 1.0); i != intervals.end() && i->first <= 1.0; ++i)
std::cout << "[" << i->first << "," << i->second << "] overlaps with [0.0,1.0]" << std::endl;
if (intervals.intersects(reflex::Ranges<float>(2.5, 10.0)))
std::cout << "intersects [2.5,10.0]" << std::endl;
if (intervals.contains(reflex::Ranges<float>(1.0, 2.5)))
std::cout << "contains [1.0,2.5]" << std::endl;

Output:

    Set of 2 intervals:
    [-1,0]
    [1,3]
    2.5 is in intervals
    [-1,0] overlaps with [0.0,1.0]
    [1,3] overlaps with [0.0,1.0]
    intersects [2.5,10.0]
    contains [1.0,2.5]

## Member Typedef Documentation

template<typename T>

typedef T reflex::Ranges< T >::bound_type

Type of the bounds.

template<typename T>

typedef container_type::const_iterator reflex::Ranges< T >::const_iterator

Synonym type defining the base class container std::set::iterator.

template<typename T>

typedef std::set< std::pair<T,T>,range_compare<T> > reflex::Ranges< T >::container_type

Synonym type defining the base class container std::set.

template<typename T>

typedef container_type::iterator reflex::Ranges< T >::iterator

Synonym type defining the base class container std::set::iterator.

template<typename T>

typedef container_type::key_compare reflex::Ranges< T >::key_compare

Synonym type defining the key/value comparison std::set::key_compare.

template<typename T>

typedef container_type::value_compare reflex::Ranges< T >::value_compare

template<typename T>

typedef container_type::value_type reflex::Ranges< T >::value_type

Synonym type defining the base class container std::set::value_type.

## Constructor & Destructor Documentation

template<typename T>

reflex::Ranges< T >::Ranges | ( |  | ) |
| inline

Construct an empty range.

template<typename T>

reflex::Ranges< T >::Ranges | ( | const value_type & | r | ) |
| inline

Construct a copy of a range [lo,hi].

template<typename T>

reflex::Ranges< T >::Ranges | ( | const bound_type & | lo,
|  | const bound_type & | hi
| ) |  |
| inline

Construct a range [lo,hi].

Parameters

  lo | lower bound
  hi | upper bound

template<typename T>

reflex::Ranges< T >::Ranges | ( | const bound_type & | val | ) |
| inline

Construct a singleton range [val,val].

Parameters

  val | value

## Member Function Documentation

template<typename T>

bool reflex::Ranges< T >::any | ( |  | ) | const
| inline

Return true if this set of ranges contains at least one range, i.e. is not empty.

Returns
  true if non empty, false if empty.

template<typename T>

bool reflex::Ranges< T >::contains | ( | const Ranges< T > & | rs | ) | const
| inline

Return true if this set of ranges contains all ranges in rs, i.e. rs is a subset of this set which means that for each range [lo,hi] in rs, there is a range [lo',hi'] such that lo' <= lo and hi <= hi'.

Returns
  true if this set contains rs.

Parameters

  rs | ranges

template<typename T>

const_iterator reflex::Ranges< T >::find | ( | const bound_type & | lo,
|  | const bound_type & | hi
| ) |  | const
| inline

Find the first range [lo',hi'] that overlaps the given range [lo,hi], i.e. lo <= hi' and lo' <= hi.

Returns
  iterator to the first range that overlaps the given range, or the end iterator.

Parameters

  lo | lower bound
  hi | upper bound

template<typename T>

const_iterator reflex::Ranges< T >::find | ( | const bound_type & | val | ) | const
| inline

Find the range [lo',hi'] that includes the given value val, i.e. lo' <= val <= hi'.

Returns
  iterator to the range that includes the value, or the end iterator.

Parameters

  val | value to search for

template<typename T>

bound_type reflex::Ranges< T >::hi | ( |  | ) | const
| inline

Return the highest value in the set of ranges (the set cannot be empty)

Returns
  highest value

template<typename T>

std::pair<iterator,bool> reflex::Ranges< T >::insert | ( | const value_type & | r | ) |
| inline

Update ranges to include range [lo,hi] by merging overlapping ranges into one range.

Returns
  a pair of an iterator to the range and a flag indicating whether the range was inserted as new.

Parameters

  r | range

template<typename T>

std::pair<iterator,bool> reflex::Ranges< T >::insert | ( | const bound_type & | lo,
|  | const bound_type & | hi
| ) |  |
| inline

Update ranges to include range [lo,hi] by merging overlapping ranges into one range.

Returns
  a pair of an iterator to the range and a flag indicating whether the range was inserted as new.

Parameters

  lo | lower bound
  hi | upper bound

template<typename T>

std::pair<iterator,bool> reflex::Ranges< T >::insert | ( | const bound_type & | val | ) |
| inline

Update ranges to include the range [val,val].

Returns
  a pair of an iterator to the range and a flag indicating whether the range was inserted as new.

Parameters

  val | value to insert

template<typename T>

bool reflex::Ranges< T >::intersects | ( | const Ranges< T > & | rs | ) | const
| inline

Return true if this set of ranges intersects with ranges rs, i.e. this set has at least one range [lo',hi'] that overlaps with a range [lo,hi] in rs such that lo <= hi' and lo' <= hi.

Returns
  true if this set intersects rs.

Parameters

  rs | ranges

template<typename T>

bound_type reflex::Ranges< T >::lo | ( |  | ) | const
| inline

Return the lowest value in the set of ranges (the set cannot be empty)

Returns
  lowest value

template<typename T>

Ranges reflex::Ranges< T >::operator& | ( | const Ranges< T > & | rs | ) | const
| inline

Returns the intersection of two range sets.

Returns
  the intersection of this range set and rs.

Parameters

  rs | range set to intersect

template<typename T>

Ranges& reflex::Ranges< T >::operator&= | ( | const Ranges< T > & | rs | ) |
| inline

Update ranges to intersect the ranges with the given range set.

Returns
  reference to this object.

Parameters

  rs | ranges to intersect

template<typename T>

Ranges reflex::Ranges< T >::operator+ | ( | const Ranges< T > & | rs | ) | const
| inline

Returns the union of two range sets, same as Ranges::operator|(rs).

Returns
  the union of this set and rs.

Parameters

  rs | ranges to merge

template<typename T>

Ranges& reflex::Ranges< T >::operator+= | ( | const Ranges< T > & | rs | ) |
| inline

Update ranges to insert the ranges of the given range set, same as Ranges::operator|=(rs).

Returns
  reference to this object.

Parameters

  rs | ranges to insert

template<typename T>

bool reflex::Ranges< T >::operator< | ( | const Ranges< T > & | rs | ) | const
| inline

True if this range set is lexicographically less than range set rs.

Returns
  true if this range set is less than rs.

Parameters

  rs | ranges

template<typename T>

bool reflex::Ranges< T >::operator<= | ( | const Ranges< T > & | rs | ) | const
| inline

True if this range set is lexicographically less or equal to range set rs.

Returns
  true if this rnage set is less or equal to rs.

Parameters

  rs | ranges

template<typename T>

bool reflex::Ranges< T >::operator> | ( | const Ranges< T > & | rs | ) | const
| inline

True if this range set is lexicographically greater than range set rs.

Returns
  true if this range set is greater than rs.

Parameters

  rs | ranges

template<typename T>

bool reflex::Ranges< T >::operator>= | ( | const Ranges< T > & | rs | ) | const
| inline

True if this range set is lexicographically greater or equal to range set rs.

Returns
  true if this is greater or equal to rs.

Parameters

  rs | ranges

template<typename T>

Ranges reflex::Ranges< T >::operator| | ( | const Ranges< T > & | rs | ) | const
| inline

Returns the union of two range sets.

Returns
  the union of this set and rs.

Parameters

  rs | ranges to merge

template<typename T>

Ranges& reflex::Ranges< T >::operator|= | ( | const Ranges< T > & | rs | ) |
| inline

Update ranges to insert the given range set, where this method has lower complexity than iterating insert() for each range in rs.

Returns
  reference to this object.

Parameters

  rs | ranges to insert

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

- ranges.h