00001 #ifndef NUMBER_IMPL_HPP_ 00002 #define NUMBER_IMPL_HPP_ 00003 00004 #include <iosfwd> 00005 #include <string> 00006 00007 #include "rational.hpp" 00008 00009 class number_impl 00010 { 00011 public: 00012 number_impl() : refcount_(1) {} 00013 virtual ~number_impl(); 00014 00016 void print(std::ostream& stream) const; 00018 std::string to_string() const; 00019 00021 void save(std::ostream& stream) const; 00023 static number_impl* read_library(std::istream& stream); 00024 00025 bool equals(number_impl const& rhs) const; 00026 bool less(number_impl const& rhs) const; 00027 00028 number_impl* add(number_impl const& rhs); 00029 number_impl* subtract(number_impl const& rhs); 00030 number_impl* multiply(number_impl const& rhs); 00031 number_impl* divide(number_impl const& rhs); 00032 00033 void add_ref(); 00034 void del_ref(); 00035 00046 number_impl* promote(number_impl& rhs) const; 00047 00048 virtual number_impl* promote_to_void(); 00049 virtual number_impl* promote_to_long(); 00050 virtual number_impl* promote_to_rational(); 00051 virtual number_impl* promote_to_double(); 00052 00053 private: 00054 number_impl(number_impl const& n); 00055 number_impl& operator=(number_impl const& n); 00056 00057 virtual std::string do_to_string() const = 0; 00058 virtual void do_save(std::ostream& stream) const = 0; 00059 00060 virtual bool do_equals(number_impl const& rhs) const = 0; 00061 virtual bool do_less(number_impl const& rhs) const = 0; 00062 00063 virtual number_impl* do_add(number_impl const& rhs) = 0; 00064 virtual number_impl* do_subtract(number_impl const& rhs) = 0; 00065 virtual number_impl* do_multiply(number_impl const& rhs) = 0; 00066 virtual number_impl* do_divide(number_impl const& rhs) = 0; 00067 00068 virtual number_impl* do_promote(number_impl& rhs) const = 0; 00069 00070 std::size_t refcount_; 00071 }; 00072 00077 class number_void : public number_impl { 00078 public: 00079 number_void() : number_impl() {} 00080 private: 00081 virtual std::string do_to_string() const; 00082 virtual void do_save(std::ostream& stream) const; 00083 virtual bool do_equals(number_impl const& rhs) const; 00084 virtual bool do_less(number_impl const& rhs) const; 00085 virtual number_impl* do_add(number_impl const& rhs); 00086 virtual number_impl* do_subtract(number_impl const& rhs); 00087 virtual number_impl* do_multiply(number_impl const& rhs); 00088 virtual number_impl* do_divide(number_impl const& rhs); 00089 virtual number_impl* do_promote(number_impl& rhs) const; 00090 }; 00091 00095 class number_long : public number_impl { 00096 public: 00097 number_long(long value) : number_impl(), value_(value) {} 00098 long value() const { return value_; } 00099 virtual number_impl* promote_to_void(); 00100 virtual number_impl* promote_to_rational(); 00101 virtual number_impl* promote_to_double(); 00102 private: 00103 virtual std::string do_to_string() const; 00104 virtual void do_save(std::ostream& stream) const; 00105 virtual bool do_equals(number_impl const& rhs) const; 00106 virtual bool do_less(number_impl const& rhs) const; 00107 virtual number_impl* do_add(number_impl const& rhs); 00108 virtual number_impl* do_subtract(number_impl const& rhs); 00109 virtual number_impl* do_multiply(number_impl const& rhs); 00110 virtual number_impl* do_divide(number_impl const& rhs); 00111 virtual number_impl* do_promote(number_impl& rhs) const; 00112 00113 long value_; 00114 }; 00115 00119 class number_rational: public number_impl { 00120 public: 00121 number_rational(rational<long> value) : number_impl(), value_(value) {} 00122 number_rational(long num) : number_impl(), value_(num) {} 00123 number_rational(long num, long den) : number_impl(), value_(num, den) {} 00124 rational<long> value() const { return value_; } 00125 virtual number_impl* promote_to_void(); 00126 virtual number_impl* promote_to_double(); 00127 private: 00128 virtual std::string do_to_string() const; 00129 virtual void do_save(std::ostream& stream) const; 00130 virtual bool do_equals(number_impl const& rhs) const; 00131 virtual bool do_less(number_impl const& rhs) const; 00132 virtual number_impl* do_add(number_impl const& rhs); 00133 virtual number_impl* do_subtract(number_impl const& rhs); 00134 virtual number_impl* do_multiply(number_impl const& rhs); 00135 virtual number_impl* do_divide(number_impl const& rhs); 00136 virtual number_impl* do_promote(number_impl& rhs) const; 00137 00138 rational<long> value_; 00139 }; 00140 00144 class number_double : public number_impl { 00145 public: 00146 number_double(double value) : number_impl(), value_(value) {} 00147 double value() const { return value_; } 00148 virtual number_impl* promote_to_void(); 00149 private: 00150 virtual std::string do_to_string() const; 00151 virtual void do_save(std::ostream& stream) const; 00152 virtual bool do_equals(number_impl const& rhs) const; 00153 virtual bool do_less(number_impl const& rhs) const; 00154 virtual number_impl* do_add(number_impl const& rhs); 00155 virtual number_impl* do_subtract(number_impl const& rhs); 00156 virtual number_impl* do_multiply(number_impl const& rhs); 00157 virtual number_impl* do_divide(number_impl const& rhs); 00158 virtual number_impl* do_promote(number_impl& rhs) const; 00159 00160 double value_; 00161 }; 00162 00163 #endif
1.5.3