Template Class Calculator

Class Documentation

template<typename T_type = double>
class calc_defs::Calculator

This class implement the expression evaluator

Public Types

typedef T_type value_type
typedef value_type *pointer
typedef const value_type *const_pointer
typedef value_type &reference
typedef const value_type &const_reference
typedef Calculator<value_type> CALCULATOR
typedef value_type (*Func1)(value_type)
typedef value_type (*Func2)(value_type, value_type)
typedef map<string, Func1> map_fun1
typedef map<string, Func2> map_fun2
typedef map<string, value_type> map_real
typedef map_fun1::iterator map_fun1_iterator
typedef map_fun1::const_iterator map_fun1_const_iterator
typedef map_fun2::iterator map_fun2_iterator
typedef map_fun2::const_iterator map_fun2_const_iterator
typedef map_real::iterator map_real_iterator
typedef map_real::const_iterator map_real_const_iterator

Public Functions

inline Calculator(void)
inline ~Calculator(void)
inline void init(void)
bool parse(char const *str)

This method do a parsing of an input string

Parameters

str – the input string to be parsed

Returns

true if no error parsing errors are found

inline bool parse(string const &str)
void parse_file(char const *name, bool show_err = false, ostream &stream = cerr)

This method do a parsing of a whole file

Parameters

  • name – the name of the input file

  • show_err – true if you wand message on error parsing

  • stream – stream for the error messages

inline void parse_file(string const &name, bool show_err = false, ostream &stream = cerr)
void report_error(ostream &s)

Print the last error found, noe if no error are found

Parameters

s – the object stream of output

inline const_reference get_value() const

\eturn the value of the last evaluated expression

void set(string const &name, value_type val)

Set or define a variable

Parameters

  • name – the name of the variable

  • val – the value to be stored

inline void set(char const *name, value_type val)
inline bool drop(string const &name)

Look if a variable exists and remove from the list

Parameters

name – the name of the variable

Returns

true if the variable exists and is dropped

inline bool drop(char const *name)
inline bool exist(string const &name) const

Look if a variable exists

Parameters

name – the name of the variable

Returns

true if the variable exists

inline bool exist(char const name[]) const
value_type get(string const &name, bool &ok)
Parameters

  • name – the name of the variable

  • ok – true if the variable exists

Returns

the value of the variable

inline value_type get(char const *name, bool &ok)
void print(ostream &s) const

Print internal status of the parser: the list of the variables constants and functions

Parameters

s – the object stream of output

inline void set_unary_fun(char const *f_name, Func1 f_ptr)

Add unary function to the parser

Parameters

  • f_name – function name

  • f_ptr – pointer to the function routine

inline void set_unary_fun(string const &f_name, Func1 f_ptr)
inline void set_binary_fun(char const *f_name, Func2 f_ptr)

Add binary function to the parser

Parameters

  • f_name – function name

  • f_ptr – pointer to the function routine

inline void set_binary_fun(string const &f_name, Func2 f_ptr)
inline bool no_error() const
Returns

true if no error found

inline map_real const &variables_map() const
Returns

a reference of the variables map.

inline void variables_merge(map_real const &ee_vars)
Returns

a reference of the variables map.