number_impl Class Reference

#include <number_impl.hpp>

Inheritance diagram for number_impl:

List of all members.

Public Member Functions
	number_impl ()
virtual	~number_impl ()
void	print (std::ostream &stream) const
std::string	to_string () const
void	save (std::ostream &stream) const
bool	equals (number_impl const &rhs) const
bool	less (number_impl const &rhs) const
number_impl *	add (number_impl const &rhs)
number_impl *	subtract (number_impl const &rhs)
number_impl *	multiply (number_impl const &rhs)
number_impl *	divide (number_impl const &rhs)
void	add_ref ()
void	del_ref ()
number_impl *	promote (number_impl &rhs) const
virtual number_impl *	promote_to_void ()
virtual number_impl *	promote_to_long ()
virtual number_impl *	promote_to_rational ()
virtual number_impl *	promote_to_double ()
Static Public Member Functions
static number_impl *	read_library (std::istream &stream)
Private Member Functions
	number_impl (number_impl const &n)
	not implemented
number_impl &	operator= (number_impl const &n)
	not implemented
virtual std::string	do_to_string () const =0
virtual void	do_save (std::ostream &stream) const =0
virtual bool	do_equals (number_impl const &rhs) const =0
virtual bool	do_less (number_impl const &rhs) const =0
virtual number_impl *	do_add (number_impl const &rhs)=0
virtual number_impl *	do_subtract (number_impl const &rhs)=0
virtual number_impl *	do_multiply (number_impl const &rhs)=0
virtual number_impl *	do_divide (number_impl const &rhs)=0
virtual number_impl *	do_promote (number_impl &rhs) const =0
Private Attributes
std::size_t	refcount_

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Detailed Description

Definition at line 9 of file number_impl.hpp.

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Constructor & Destructor Documentation

number_impl::number_impl

(

)

[inline]

Definition at line 12 of file number_impl.hpp.

: refcount_(1) {}

number_impl::~number_impl

(

)

[virtual]

Definition at line 8 of file number_impl.cpp.

{}

number_impl::number_impl

(

number_impl const &

n

)

[private]

not implemented

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Member Function Documentation

void number_impl::print

(

std::ostream &

stream

)

const

Print in a human-readable form.

Definition at line 55 of file number_impl.cpp.

References to_string().

Referenced by number::print().

{
  stream << to_string();
}

std::string number_impl::to_string

(

)

const

Convert to a string.

Definition at line 61 of file number_impl.cpp.

References do_to_string().

Referenced by print(), and number::to_string().

{
  return do_to_string();
}

void number_impl::save

(

std::ostream &

stream

)

const

Save a number to a library file.

Definition at line 23 of file number_impl.cpp.

References do_save().

Referenced by number::save().

{
  do_save(stream);
}

number_impl * number_impl::read_library

(

std::istream &

stream

)

[static]

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

Definition at line 29 of file number_impl.cpp.

{
  std::string type;
  if (not (stream >> type))
    throw calc_error("malformed library, missing number type");

  if (type == "void")
    return new number_void();

  if (type == "long") {
    long x;
    if (not (stream >> x))
      throw calc_error("malformed library, missing long value");
    return new number_long(x);
  }

  if (type == "double") {
    double x;
    if (not (stream >> x))
      throw calc_error("malformed library, missing double value");
    return new number_long(x);
  }

  throw calc_error("malformed library, unknown number type: " + type);
}

bool number_impl::equals

(

number_impl const &

rhs

)

const

Definition at line 73 of file number_impl.cpp.

References do_equals().

Referenced by number::equals().

{
  return do_equals(rhs);
}

bool number_impl::less

(

number_impl const &

rhs

)

const

Definition at line 79 of file number_impl.cpp.

References do_less().

Referenced by number::less().

{
  return do_less(rhs);
}

number_impl * number_impl::add

(

number_impl const &

rhs

)

Definition at line 85 of file number_impl.cpp.

References do_add().

Referenced by number::operator+().

{
  return do_add(rhs);
}

number_impl * number_impl::subtract

(

number_impl const &

rhs

)

Definition at line 90 of file number_impl.cpp.

References do_subtract().

Referenced by number::operator-().

{
  return do_subtract(rhs);
}

number_impl * number_impl::multiply

(

number_impl const &

rhs

)

Definition at line 95 of file number_impl.cpp.

References do_multiply().

Referenced by number::operator *().

{
  return do_multiply(rhs);
}

number_impl * number_impl::divide

(

number_impl const &

rhs

)

Definition at line 100 of file number_impl.cpp.

References do_divide().

Referenced by number::operator/().

{
  return do_divide(rhs);
}

void number_impl::add_ref

(

)

Definition at line 11 of file number_impl.cpp.

References refcount_.

Referenced by number_void::do_add(), number_void::do_divide(), number_void::do_multiply(), number_void::do_subtract(), number::number(), number::operator=(), promote_to_double(), promote_to_long(), promote_to_rational(), and promote_to_void().

{
  ++refcount_;
}

void number_impl::del_ref

(

)

Definition at line 16 of file number_impl.cpp.

References refcount_.

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

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

number_impl * number_impl::promote

(

number_impl &

rhs

)

const

Promote rhs to match the type of this number. This function uses double-dispatch, so this number calls a virtual promote_to_*() function that notifies rhs of the desired type. If the desired type is "larger" than the type of rhs, the promote_to_*() function returns a new number_impl of the desired type. Otherwise, the function returns rhs.

Parameters:

rhs

The right-hand operand of an arithmetic expression.

Definition at line 67 of file number_impl.cpp.

References do_promote().

Referenced by number::coerce().

{
  return do_promote(rhs);
}

number_impl * number_impl::promote_to_void

(

)

[virtual]

Reimplemented in number_long, number_rational, and number_double.

Definition at line 109 of file number_impl.cpp.

References add_ref().

Referenced by number_void::do_promote().

{
  add_ref();
  return this;
}

number_impl * number_impl::promote_to_long

(

)

[virtual]

Definition at line 115 of file number_impl.cpp.

References add_ref().

Referenced by number_long::do_promote().

{
  add_ref();
  return this;
}

number_impl * number_impl::promote_to_rational

(

)

[virtual]

Reimplemented in number_long.

Definition at line 121 of file number_impl.cpp.

References add_ref().

Referenced by number_rational::do_promote().

{
  add_ref();
  return this;
}

number_impl * number_impl::promote_to_double

(

)

[virtual]

Reimplemented in number_long, and number_rational.

Definition at line 127 of file number_impl.cpp.

References add_ref().

Referenced by number_double::do_promote().

{
  add_ref();
  return this;
}

number_impl& number_impl::operator=

(

number_impl const &

n

)

[private]

not implemented

virtual std::string number_impl::do_to_string

(

)

const [private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by to_string().

virtual void number_impl::do_save

(

std::ostream &

stream

)

const [private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by save().

virtual bool number_impl::do_equals

(

number_impl const &

rhs

)

const [private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by equals().

virtual bool number_impl::do_less

(

number_impl const &

rhs

)

const [private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by less().

virtual number_impl* number_impl::do_add

(

number_impl const &

rhs

)

[private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by add().

virtual number_impl* number_impl::do_subtract

(

number_impl const &

rhs

)

[private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by subtract().

virtual number_impl* number_impl::do_multiply

(

number_impl const &

rhs

)

[private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by multiply().

virtual number_impl* number_impl::do_divide

(

number_impl const &

rhs

)

[private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by divide().

virtual number_impl* number_impl::do_promote

(

number_impl &

rhs

)

const [private, pure virtual]

Implemented in number_void, number_long, number_rational, and number_double.

Referenced by promote().

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Member Data Documentation

std::size_t number_impl::refcount_ [private]

Definition at line 70 of file number_impl.hpp.

Referenced by add_ref(), and del_ref().

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

• number_impl.hpp
• number_impl.cpp

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