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# node Class Reference

`#include <node.hpp>`

List of all members.

## Public Member Functions
| node ()
| node (double number)
| node (std::string const &identifier)
| node (node identifier, node number)
| node (char op, node operand)
| node (node left, char op, node right)
| node (node const &n)
| ~node ()
node & | operator= (node const &n)
void | print (std::ostream &stream, int indent=0) const
double | evaluate () const
std::string | to_string () const
## Static Private Member Functions
static node_impl * | make_binary_operator (node, char, node)
| Factory function to make the binary operator nodes.
## Private Attributes
node_impl * | pimpl_

## Detailed Description

Wrapper class for all parse-tree nodes. The actual parse tree nodes derive from node_impl. This class uses the pimpl idiom to make it easier to work with node objects.

Definition at line 15 of file node.hpp.

## Constructor & Destructor Documentation

node::node | ( |  | ) |

Construct a node of type void.

Definition at line 20 of file node.cpp.

    00021 : pimpl_(new node_void())
    00022 {}

node::node | ( | double | number | ) |

Construct a numeric node.

Parameters:

  | number | The number

Definition at line 30 of file node.cpp.

    00031 : pimpl_(new node_number(number))
    00032 {}

node::node | ( | std::string const & | identifier | ) |

Construct an identifier node.

Parameters:

  | identifier | The name of the identifier

Definition at line 34 of file node.cpp.

    00035 : pimpl_(new node_identifier(identifier))
    00036 {}

node::node | ( | node | identifier,
|  | node | number |
| ) |  |  |

Construct an assignment node.

Parameters:

  | identifier | The name of the variable that is the target of the assignment
  | number | the node for the expression to assign to the variable

Definition at line 38 of file node.cpp.

    00039 : pimpl_(new node_assign(identifier, number))
    00040 {}

node::node | ( | char | op,
|  | node | operand |
| ) |  |  |

Construct a unary operator node.

Parameters:

  | op | The operator character, e.g., `'-'`
  | operand | The operand node

Definition at line 42 of file node.cpp.

    00043 : pimpl_(new node_negate(operand))
    00044 {}

node::node | ( | node | left,
|  | char | op,
|  | node | right |
| ) |  |  |

Construct a binary operator node.

Parameters:

  | left | The left-hand parse-tree
  | op | The operator character, e.g., `'*'`
  | right | The right-hand operand

Definition at line 46 of file node.cpp.

    00047 : pimpl_(make_binary_operator(left, op, right))
    00048 {}

node::node | ( | node const & | n | ) |

Copy constructor. Increments the reference count.

Parameters:

  | n | The node to copy

Definition at line 24 of file node.cpp.

References node_impl::add_ref(), and pimpl_.

    00025 : pimpl_(n.pimpl_)
    00026 {
    00027   pimpl_->add_ref();
    00028 }

node::~node | ( |  | ) |

Destructor. Decrements the reference count.

Definition at line 50 of file node.cpp.

References node_impl::del_ref(), and pimpl_.

    00051 {
    00052   pimpl_->del_ref();
    00053 }

## Member Function Documentation

node & node::operator= | ( | node const & | n | ) |

Copy assignment operator decrements the reference count.

Parameters:

  | n | the source of the assignment

Definition at line 55 of file node.cpp.

References node_impl::add_ref(), node_impl::del_ref(), and pimpl_.

    00056 {
    00057   n.pimpl_->add_ref();
    00058   pimpl_->del_ref();
    00059   pimpl_ = n.pimpl_;
    00060
    00061   return *this;
    00062 }

void node::print | ( | std::ostream & | stream,
|  | int | indent = `0` |
| ) |  |  | const

Print a tree. For debugging, print a visual representation of the parse tree. Each level increments the `indent` to make the tree structure evident.

Parameters:

  | stream | The output stream
  | indent | The indentation.

Definition at line 64 of file node.cpp.

References pimpl_, and node_impl::print().

Referenced by node_divide::print_node(), node_multiply::print_node(), node_subtract::print_node(), node_add::print_node(), node_negate::print_node(), and node_assign::print_node().

    00066 {
    00067   pimpl_->print(stream, indent);
    00068 }

double node::evaluate | ( |  | ) | const

Evaluate a parse tree. Evaluate and tree and return the result.

Definition at line 70 of file node.cpp.

References node_impl::evaluate(), and pimpl_.

Referenced by BOOST_AUTO_TEST_CASE(), node_binary::evaluate_left(), node_unary::evaluate_operand(), node_binary::evaluate_right(), node_assign::evaluate_value(), and parse_loop().

    00072 {
    00073   return pimpl_->evaluate();
    00074 }

std::string node::to_string | ( |  | ) | const

Return a string representation. For an identifier node, return the identifier. For all other nodes, return a string representation of the evaluated value.

Definition at line 76 of file node.cpp.

References pimpl_, and node_impl::to_string().

Referenced by BOOST_AUTO_TEST_CASE(), and node_assign::get_identifier().

    00078 {
    00079   return pimpl_->to_string();
    00080 }

node_impl * node::make_binary_operator | ( | node | left,
|  | char | op,
|  | node | right |
| ) |  |  | `[static, private]`

Factory function to make the binary operator nodes.

Definition at line 6 of file node.cpp.

    00007 {
    00008   if (op == '+')
    00009     return new node_add(left, right);
    00010   else if (op == '-')
    00011     return new node_subtract(left, right);
    00012   else if (op == '*')
    00013     return new node_multiply(left, right);
    00014   else if (op == '/')
    00015     return new node_divide(left, right);
    00016   else
    00017     throw std::logic_error("fatal error in make_binary_opreator: unknown operator: " + op);
    00018 }

## Member Data Documentation

node_impl* node::pimpl_`[private]`

Definition at line 79 of file node.hpp.

Referenced by evaluate(), node(), operator=(), print(), to_string(), and ~node().

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

- node.hpp
- node.cpp