142 lines
4.5 KiB
C++
142 lines
4.5 KiB
C++
/*
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* Copyright (C) 2005 Maarten Keijzer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef FUNCTION_DEF_H_
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#define FUNCTION_DEF_H_
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#include <string>
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#include <vector>
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#include <memory>
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#include "Sym.h"
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#include "Interval.h"
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class FunDef {
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public:
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virtual ~FunDef() {}
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// (possibly) lazy evaluation function, default implementation calls 'eager' eval
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virtual double eval(const SymVec& args, const std::vector<double>& inputs) const;
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// eager evaluation function
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virtual double eval(const std::vector<double>& args, const std::vector<double>& inputs) const = 0;
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// interval evaluation
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virtual Interval eval(const std::vector<Interval>& args, const std::vector<Interval>& inputs) const = 0;
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// prints 'c' like code
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virtual std::string c_print(const std::vector<std::string>& names, const std::vector<std::string>& names) const = 0;
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virtual unsigned min_arity() const = 0;
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virtual bool has_varargs() const { return false; } // sum, prod, min, max are variable arity
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virtual std::string name() const = 0;
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protected:
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};
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extern std::vector<const FunDef*> get_defined_functions();
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extern const FunDef& get_element(token_t token);
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/** Single case evaluation */
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extern double eval(const Sym& sym, const std::vector<double>& inputs);
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/** Static analysis through interval arithmetic */
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extern Interval eval(const Sym& sym, const std::vector<Interval>& inputs);
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/** Pretty printers, second version allows setting of variable names */
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extern std::string c_print(const Sym& sym);
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/** Pretty printers, allows setting of variable names */
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extern std::string c_print(const Sym& sym, const std::vector<std::string>& var_names);
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/** Pretty printer streamer */
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inline std::ostream& operator<<(std::ostream& os, Sym sym) { return os << c_print(sym); }
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/** Create constant with this value, memory is managed. If reference count drops to zero value is deleted. */
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extern Sym SymConst(double value);
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/** Get out the values for all constants in the expression */
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std::vector<double> get_constants(Sym sym);
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/** Set the values for all constants in the expression. Vector needs to be the same size as the one get_constants returns
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* The argument isn't touched, it will return a new sym with the constants set. */
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Sym set_constants(Sym sym, const std::vector<double>& constants);
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/** check if a token is constant (for instance Sym sym; is_constant(sym.token()); ) */
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extern bool is_constant(token_t token);
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/** Create variable */
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extern Sym SymVar(unsigned idx);
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/** simplifies a sym (sym_operations.cpp) */
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extern Sym simplify(Sym sym);
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/** differentiates a sym to a token (sym_operations.cpp) */
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extern Sym differentiate(Sym sym, token_t var_token);
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/* Add function to the language table (and take a guess at the arity) */
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class LanguageTable;
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extern void add_function_to_table(LanguageTable& table, token_t token);
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// token names
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extern const token_t sum_token;
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extern const token_t prod_token;
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extern const token_t inv_token;
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extern const token_t min_token;
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extern const token_t pow_token;
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extern const token_t ifltz_token;
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#define HEADERFUNC(name) extern const token_t name##_token;\
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inline Sym name(Sym arg) { return Sym(name##_token, arg); }
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/* This defines the tokens: sin_token, cos_token, etc. */
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HEADERFUNC(sin);
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HEADERFUNC(cos);
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HEADERFUNC(tan);
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HEADERFUNC(asin);
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HEADERFUNC(acos);
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HEADERFUNC(atan);
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HEADERFUNC(sinh);
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HEADERFUNC(cosh);
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HEADERFUNC(tanh);
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HEADERFUNC(asinh);
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HEADERFUNC(acosh);
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HEADERFUNC(atanh);
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HEADERFUNC(exp);
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HEADERFUNC(log);
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HEADERFUNC(sqr);
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HEADERFUNC(sqrt);
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extern std::string get_prototypes();
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// reading and writing in internal format
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extern std::string write_raw(const Sym& sym);
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extern void write_raw(ostream& os, const Sym& sym);
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extern Sym read_raw(std::string str);
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extern Sym read_raw(std::istream& is);
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extern void read_raw(std::istream& is, Sym& sym);
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#include "SymOps.h"
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#endif
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