node_impl Class Reference

#include <node_impl.hpp>

Inheritance diagram for node_impl:

List of all members.

Public Member Functions
	node_impl ()
virtual	~node_impl ()
void	print (std::ostream &stream, int indent) const
number	evaluate () const
std::string	to_string () const
identifier_list const &	get_parameters () const
void	add_ref ()
void	del_ref ()
void	save (std::ostream &stream) const
Static Public Member Functions
static node_impl *	read_node (std::istream &stream)
Private Member Functions
	node_impl (node_impl const &n)
	not implemented
node_impl &	operator= (node_impl const &n)
	not implemented
virtual void	print_node (std::ostream &stream, int indent) const =0
virtual number	evaluate_node () const =0
virtual std::string	evaluate_string () const
virtual identifier_list const &	evaluate_parameters () const
virtual void	save_node (std::ostream &stream) const =0
Private Attributes
std::size_t	refcount_

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Detailed Description

Base class for all parse tree nodes. The node classes all derive from node_impl. Each derived class overrides print_node(), for debugging and evalute_node() to evaluate the node. A few classes also override evaluate_string(), but most classes can inherit the node_impl::evaluate_string implementation, which prints the result of calling evaluate().

This class primarily manages the reference count.

Definition at line 19 of file node_impl.hpp.

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Constructor & Destructor Documentation

node_impl::node_impl

(

)

Definition at line 11 of file node_impl.cpp.

: refcount_(1)
{}

node_impl::~node_impl

(

)

[virtual]

Definition at line 15 of file node_impl.cpp.

{}

node_impl::node_impl

(

node_impl const &

n

)

[private]

not implemented

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Member Function Documentation

void node_impl::print	(	std::ostream &	stream,
		int	indent
	)			const

Definition at line 18 of file node_impl.cpp.

References print_node().

Referenced by node::print().

{
  print_node(stream, indent);
}

number node_impl::evaluate

(

)

const

Definition at line 24 of file node_impl.cpp.

References evaluate_node().

Referenced by node::evaluate(), and evaluate_string().

{
  return evaluate_node();
}

std::string node_impl::to_string

(

)

const

Definition at line 30 of file node_impl.cpp.

References evaluate_string().

Referenced by node::to_string().

{
  return evaluate_string();
}

identifier_list const & node_impl::get_parameters

(

)

const

Definition at line 41 of file node_impl.cpp.

References evaluate_parameters().

Referenced by node::get_parameters().

{
  return evaluate_parameters();
}

void node_impl::add_ref

(

)

Definition at line 36 of file node_impl.cpp.

References refcount_.

Referenced by node::node(), and node::operator=().

{
  ++refcount_;
}

void node_impl::del_ref

(

)

Definition at line 47 of file node_impl.cpp.

References refcount_.

Referenced by node::operator=(), and node::~node().

{
  --refcount_;
  if (refcount_ == 0)
    delete this;
}

void node_impl::save

(

std::ostream &

stream

)

const

Definition at line 69 of file node_impl.cpp.

References save_node().

Referenced by node::save().

{
  save_node(stream);
}

node_impl * node_impl::read_node

(

std::istream &

stream

)

[static]

Read the node type from a library file, then create the proper kind of node.

Definition at line 76 of file node_impl.cpp.

{
  std::string type;
  if (not (stream >> type))
    return 0;
  if (type == "void")
    return new node_void(stream);
  if (type == "number")
    return new node_number(stream);
  if (type == "identifier")
    return new node_identifier(stream);
  if (type == "function")
    return new node_function(stream);
  if (type == "call")
    return new node_function_call(stream);
  if (type == "negate")
    return new node_negate(stream);
  if (type == "add")
    return new node_add(stream);
  if (type == "subtract")
    return new node_subtract(stream);
  if (type == "multiply")
    return new node_multiply(stream);
  if (type == "divide")
    return new node_divide(stream);

  throw calc_error("unknown node type: " + type);
}

node_impl& node_impl::operator=

(

node_impl const &

n

)

[private]

not implemented

virtual void node_impl::print_node	(	std::ostream &	stream,
		int	indent
	)			const [private, pure virtual]

Implemented in node_void, node_number, node_identifier, node_function, node_function_call, node_unary, node_binary, node_negate, node_add, node_subtract, node_multiply, and node_divide.

Referenced by print().

virtual number node_impl::evaluate_node

(

)

const [private, pure virtual]

Implemented in node_void, node_number, node_identifier, node_function, node_function_call, node_unary, node_binary, node_negate, node_add, node_subtract, node_multiply, and node_divide.

Referenced by evaluate().

std::string node_impl::evaluate_string

(

)

const [private, virtual]

Reimplemented in node_void, and node_identifier.

Definition at line 54 of file node_impl.cpp.

References evaluate().

Referenced by to_string().

{
  std::ostringstream stream;
  stream << evaluate();
  return stream.str();
}

identifier_list const & node_impl::evaluate_parameters

(

)

const [private, virtual]

Reimplemented in node_function.

Definition at line 62 of file node_impl.cpp.

Referenced by get_parameters().

{
  static identifier_list const empty;
  return empty;
}

virtual void node_impl::save_node

(

std::ostream &

stream

)

const [private, pure virtual]

Implemented in node_void, node_number, node_identifier, node_function, node_function_call, node_unary, node_binary, node_negate, node_add, node_subtract, node_multiply, and node_divide.

Referenced by save().

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Member Data Documentation

std::size_t node_impl::refcount_ [private]

Definition at line 49 of file node_impl.hpp.

Referenced by add_ref(), and del_ref().

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

• node_impl.hpp
• node_impl.cpp

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