error.h

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#ifndef THEORETICA_ERROR_H
#define THEORETICA_ERROR_H
 
#if defined(THEORETICA_THROW_EXCEPTIONS) || defined(THEORETICA_ONLY_EXCEPTIONS)
 
#include <exception>
 
#ifndef THEORETICA_NO_PRINT
#include <sstream>
#endif
 
#endif
 
#include <string>
#include <cerrno>
#include <limits>
#include "./constants.h"
 
 
namespace theoretica {
 
 
    enum class MathError : int {
        None = 0x00,                
        DivByZero = 0x01,           
        OutOfDomain = 0x02,         
        OutOfRange = 0x04,          
        ImpossibleOperation = 0x08, 
        NoConvergence = 0x10,       
        InvalidArgument = 0x20      
    };
 
 
    inline int to_errno(MathError err) {
        switch(err) {
            case MathError::None: return 0; break;
            case MathError::DivByZero: return ERANGE; break;
            case MathError::OutOfDomain: return EDOM; break;
            case MathError::OutOfRange: return ERANGE; break;
            case MathError::ImpossibleOperation: return EDOM; break;
            case MathError::NoConvergence: return ERANGE; break;
            case MathError::InvalidArgument: return EINVAL; break;
            default: return 0; break;
        }
    }
 
 
    inline const char* to_cstring(MathError err) {
        switch (err) {
            case MathError::None: return "No error"; break;
            case MathError::DivByZero: return "Division by zero"; break;
            case MathError::OutOfDomain:
                return "An argument was out of the domain of the called function"; break;
            case MathError::ImpossibleOperation:
                return "A mathematically impossible operation was requested"; break;
            case MathError::NoConvergence: return "The algorithm did not converge"; break;
            case MathError::InvalidArgument: return "Invalid argument size or value"; break;
            default: return "Unknown error"; break;
        }
    }
 
 
    inline std::string to_string(MathError err) {
        return to_cstring(err);
    }
 
 
    inline TH_CONSTEXPR real nan() {
        return std::numeric_limits<real>::quiet_NaN();
    }
 
 
    template<typename T>
    inline bool is_nan(const T& x) {
        return !(x == x);
    }
 
 
    inline TH_CONSTEXPR real inf() {
        return std::numeric_limits<real>::infinity();
    }
 
 
    inline bool is_inf(real x) {
        return (x == inf()) || (x == -inf());
    }
 
 
#if defined(THEORETICA_THROW_EXCEPTIONS) || defined(THEORETICA_ONLY_EXCEPTIONS)
 
    class math_exception : std::exception {
 
    private:
        MathError err;
        std::string func_name;
        std::string file_name;
        unsigned int code_line;
        real val;
 
    public:
    
        math_exception(MathError a_err, const std::string& a_func_name,
            const std::string& a_file_name, unsigned int a_code_line, real a_val)
                : err(a_err), func_name(a_func_name), file_name(a_file_name),
                    code_line(a_code_line), val(a_val) {}
 
        ~math_exception() = default;
 
 
        inline const char* what() const noexcept {
            return to_cstring(err);
        }
 
 
        inline MathError err_code() const {
            return err;
        }
 
 
        inline std::string get_function_name() const {
            return func_name;
        }
 
 
        inline std::string get_file_name() const {
            return file_name;
        }
 
 
        inline unsigned int get_line_number() const {
            return code_line;
        }
 
 
        inline real get_value() const {
            return val;
        }
        
 
#ifndef THEORETICA_NO_PRINT
 
        inline std::string to_string() const {
 
            std::stringstream err_str;
 
            err_str << file_name << "(" << code_line << "):";
            err_str << func_name << "(" << val << "): ";
            err_str << to_string(err);
 
            return err_str.str();
        }
 
 
        inline operator std::string() {
            return to_string();
        }
 
 
        inline friend std::ostream& operator<<(std::ostream& out, const math_exception& obj) {
            return out << obj.to_string();
        }
 
#endif
 
    };
 
#endif
 
}
 
 
 
 
// Only throw exceptions, without modifying errno
#ifdef THEORETICA_ONLY_EXCEPTIONS
 
#define TH_MATH_ERROR(F_NAME, VALUE, EXCEPTION) \
    { throw theoretica::math_exception(EXCEPTION, F_NAME, __FILE__, __LINE__, VALUE); }
 
// Throw exceptions and modify errno
#elif defined(THEORETICA_THROW_EXCEPTIONS)
 
#define TH_MATH_ERROR(F_NAME, VALUE, EXCEPTION) \
    { errno = theoretica::to_errno(EXCEPTION); \
    throw math_exception(EXCEPTION, F_NAME, __FILE__, __LINE__, VALUE); }
 
// Modify errno only by default
#else
 
#define TH_MATH_ERROR(F_NAME, VALUE, EXCEPTION) \
    { errno = theoretica::to_errno(EXCEPTION); }
 
#endif
 
 
// Output the value of an expression with additional information,
// for debugging purposes.
#define TH_DEBUG(VARIABLE) { \
    std::cout << __FILE__ << ":" << __LINE__ << ": " \
    << #VARIABLE << " = " << VARIABLE << std::endl; }
 
 
#endif