Set

class ampl::Set : public ampl::BasicEntity<SetInstance>

Represents an AMPL set.

In case of not indexed sets, this class exposes iterators for accessing its elements. The members of the set are tuples, represented by objects of class ampl::Tuple.

All these methods throw an std::logic_error if called for an indexed set.

In case of indexed sets, you can gain access to the instances (of class ampl::SetInstance) using the methods Set::get(), using the operator Set::operator[]() or via Set::instances(), which returns an InstanceRange providing iterators.

Data can be assigned to the set using the methods Set::setValues (for non-indexed sets only) or using ampl::setData and an object of class ampl::DataFrame.

Instance access

Methods to access the instances which are part of this Entity

inline SetInstance get() const

Get the instance corresponding to a scalar entity.

Throws

  • runtime_error – if the entity has been deleted in the underlying AMPL interpreter

  • logic_error – if the entity is not scalar

Returns

The corresponding instance.

inline SetInstance get(TupleRef index) const

Get the instance with the specified index.

Parameters

index – The tuple specifying the index

Throws

  • out_of_range – if an instance with the specified index does not exist

  • out_of_range – if the entity has been deleted in the underlying AMPL interpreter

  • ampl::UnsupportedOperationException – if the entity is scalar

Returns

The corresponding instance

inline SetInstance get(VariantRef v1) const

Get the instance with the specified index.

inline SetInstance get(VariantRef v1, VariantRef v2) const

Get the instance with the specified index.

inline SetInstance get(VariantRef v1, VariantRef v2, VariantRef v3) const

Get the instance with the specified index.

inline SetInstance get(VariantRef v1, VariantRef v2, VariantRef v3, VariantRef v4) const

Get the instance with the specified index.

Parameters

  • v1 – The VariantRef specifying the first element of the indexing tuple

  • v2 – The VariantRef specifying the second element of the indexing tuple

  • v3 – The VariantRef specifying the third element of the indexing tuple

  • v4 – The VariantRef specifying the fourth element of the indexing tuple

Throws

  • out_of_range – if an instance with the specified index does not exist

  • runtime_error – if the entity has been deleted in the underlying AMPL interpreter

  • ampl::UnsupportedOperationException – if the entity is scalar

Returns

The corresponding instance

inline SetInstance operator[](TupleRef index) const
inline SetInstance operator[](VariantRef v1) const

Public Types

typedef SetInstance::MemberRange MemberRange

Class to access the members of this set (valid only for non-indexed sets)

typedef internal::CountedIterator<internal::EntityWrapper<SetInstance>> iterator

Iterator for entities, represented by an iterator pointing to elements of type std::pair<TupleRef, InstanceClass>

Public Functions

inline InstanceRange instances() const

Get the InstanceRange used to iterate over all the instances in a Set.

inline std::size_t arity() const

The arity of s, or number of components in each member of this set.

inline DataFrame getValues() const

Get values of this set in a DataFrame.

Valid only for non indexed sets.

See

SetInstance::getValues()

inline MemberRange members() const

Get of this Set.

Valid only for non indexed sets.

See

SetInstance::members()

inline std::size_t size() const

Get the number of tuples in this set.

Valid only for non indexed sets.

inline bool contains(TupleRef t) const

Check wether this set instance contains the specified Tuple.

Valid only for non indexed sets.

Parameters

t – Tuple to be found

inline void setValues(internal::Args objects, std::size_t n)

Set values.

Valid only for non indexed sets.

See

SetInstance::setValues()

inline void setValues(const Tuple objects[], std::size_t n)

Set values.

Valid only for non indexed sets.

See

SetInstance::setValues()

inline void setValues(DataFrame data)

Set values.

Valid only for non indexed sets.

See

SetInstance::setValues()

inline iterator begin() const

Get an iterator pointing to the first instance in this entity.

inline iterator end() const

Get an iterator pointing after the last instance in this entity.

inline iterator find(TupleRef t) const

Searches the current entity for an instance with the specified index.

Returns

an iterator to the wanted entity if found, otherwise an iterator to BasicEntity::end.

inline StringArray getIndexingSets() const

Get the AMPL string representation of the sets on which this entity is indexed.

The obtained vector can be modified without any effect to the entity.

Returns

The string representation of the indexing sets for this entity or an empty array if the entity is scalar

inline std::size_t indexarity() const

Get the indexarity of this entity (sum of the dimensions of the indexing sets).

This value indicates the arity of the Tuple to be passed to the method BasicEntity::get() in order to access an instance of this entity. See the following AMPL examples 

var x;               # indexarity = 0
var y {1..2};        # indexarity = 1
var z {1..2,3..4};   # indexarity = 2
var zz {{(1, 2)}};   # indexarity = 2

Returns

The sum of the dimensions of the indexing sets or 0 if the entity is not indexed

inline bool isScalar() const

Check whether this entity is scalar.

Equivalent to testing whether indexarity() is equal to zero.

Returns

True if the entity is scalar (not indexed over any set)

inline std::string name() const

Get the name of this entity.

inline std::size_t numInstances() const

Get the number of instances in this entity.

inline std::string toString() const

Returns a string representation of this entity (its declaration)

inline StringArray xref() const

Get the names of all entities which depend on this one.

Returns

An array with the names of all entities which depend on this one.

class InstanceRange

Class used to iterate over all the instances of a Set. For example, supposing an indexed set set A{1..2}; is defined in an AMPL object named ampl:

ampl::Set A = ampl.getSet("A");
for (ampl::SetInstance s: A.instances())
  std::cout << s.name() << "\n";

Public Types

typedef Set::iterator iterator

Iterator over instances of an indexed set.

Public Functions

inline iterator begin() const

Get an iterator pointing to the first instance in this set.

inline iterator end() const

Get an iterator pointing after the last instance in this entity.

inline iterator find(TupleRef t) const

Searches the current entity for an instance with the specified index.

Returns

an iterator to the SetInstance if found, otherwise InstanceRange::end.

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