# Parma_Polyhedra_Library::PIP_Tree_Node::Artificial_Parameter Class Reference

Artificial parameters in PIP solution trees. More...

`#include <ppl.hh>`

Inherits Parma_Polyhedra_Library::Linear_Expression.

List of all members.

## Public Member Functions
| Artificial_Parameter ()
| Default constructor: builds a zero artificial parameter.
| Artificial_Parameter (const Linear_Expression &expr, Coefficient_traits::const_reference den)
| Constructor.
| Artificial_Parameter (const Artificial_Parameter &y)
| Copy constructor.
Coefficient_traits::const_reference | denominator () const
| Returns the normalized (i.e., positive) denominator.
void | swap (Artificial_Parameter &y)
| Swaps `*this` with `y`.
bool | operator== (const Artificial_Parameter &y) const
| Returns `true` if and only if `*this` and `y` are equal.
bool | operator!= (const Artificial_Parameter &y) const
| Returns `true` if and only if `*this` and `y` are different.
void | ascii_dump () const
| Writes to `std::cerr` an ASCII representation of `*this`.
void | ascii_dump (std::ostream &s) const
| Writes to `s` an ASCII representation of `*this`.
void | print () const
| Prints `*this` to `std::cerr` using `operator<<`.
bool | ascii_load (std::istream &s)
| Loads from `s` an ASCII representation (as produced by ascii_dump(std::ostream&) const) and sets `*this` accordingly. Returns `true` if successful, `false` otherwise.
memory_size_type | total_memory_in_bytes () const
| Returns the total size in bytes of the memory occupied by `*this`.
memory_size_type | external_memory_in_bytes () const
| Returns the size in bytes of the memory managed by `*this`.
bool | OK () const
| Returns `true` if and only if the parameter is well-formed.
## Related Functions
(Note that these are not member functions.)
std::ostream & | operator<< (std::ostream &os, const PIP_Tree_Node::Artificial_Parameter &x)
| Output operator.

## Detailed Description

Artificial parameters in PIP solution trees.

These parameters are built from a linear expression combining other parameters (constant term included) divided by a positive integer denominator. Coefficients at variables indices corresponding to PIP problem variables are always zero.

## Constructor & Destructor Documentation

Parma_Polyhedra_Library::PIP_Tree_Node::Artificial_Parameter::Artificial_Parameter | ( | const Linear_Expression & | expr,
|  | Coefficient_traits::const_reference | den |
| ) |  |  |

Constructor.

Builds artificial parameter .

Parameters:

  | expr | The expression that, after normalization, will form the numerator of the artificial parameter.
  | den | The integer constant thatm after normalization, will form the denominator of the artificial parameter.

Exceptions:

  | std::invalid_argument | Thrown if `den` is zero.

Normalization will ensure that the denominator is positive.

## Member Function Documentation

bool Parma_Polyhedra_Library::PIP_Tree_Node::Artificial_Parameter::operator== | ( | const Artificial_Parameter & | y | ) | const

Returns `true` if and only if `*this` and `y` are equal.

Note that two artificial parameters having different space dimensions are considered to be different.

## Friends And Related Function Documentation

std::ostream & operator<< | ( | std::ostream & | os,
|  | const PIP_Tree_Node::Artificial_Parameter & | x |
| ) |  |  | `[related]`

Output operator.

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

- ppl.hh