ssgx_decimal_t.h

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#ifndef SAFEHERON_SGX_TRUSTED_DECIMAL_H
#define SAFEHERON_SGX_TRUSTED_DECIMAL_H
 
#include <string>
 
struct mpd_context_t;
struct mpd_t;
 
namespace ssgx {
 
namespace decimal_t {
 
enum class RoundType {
    RoundUp = 0,        /* round away from 0               */
    RoundDown = 1,      /* round toward 0 (truncate)       */
    RoundCeiling = 2,   /* round toward +infinity          */
    RoundFloor = 3,     /* round toward -infinity          */
    RoundHalfUp = 4,   /* 0.5 is rounded up               */
    RoundHalfDown = 5, /* 0.5 is rounded down             */
    RoundHalfEven = 6, /* 0.5 is rounded to even          */
    Round05Up = 7,      /* round zero or five away from 0  */
    RoundTrunc = 8      /* truncate, but set infinity      */
};
 
class Precision {
  public:
    Precision(RoundType round_type, int scale);
    ~Precision();
 
  public:
    friend class BigDecimal;
 
  private:
    [[nodiscard]] mpd_context_t* Get() const;
    mpd_context_t* ptr_ctx_;
    int scale_;
};
 
class BigDecimal {
  public:
    explicit BigDecimal();
 
    explicit BigDecimal(const char* str);
 
    BigDecimal(const BigDecimal& num);
 
    BigDecimal& operator=(const BigDecimal& num);
 
    BigDecimal(BigDecimal&& num) noexcept;
 
    BigDecimal& operator=(BigDecimal&& num) noexcept;
 
    virtual ~BigDecimal();
 
    [[nodiscard]] BigDecimal Add(const BigDecimal& num) const;
    [[nodiscard]] BigDecimal Add(const BigDecimal& num, const Precision& prec) const;
 
    [[nodiscard]] BigDecimal Sub(const BigDecimal& num) const;
    [[nodiscard]] BigDecimal Sub(const BigDecimal& num, const Precision& prec) const;
 
    [[nodiscard]] BigDecimal Multiply(const BigDecimal& num) const;
    [[nodiscard]] BigDecimal Multiply(const BigDecimal& num, const Precision& prec) const;
 
    [[nodiscard]] BigDecimal Div(const BigDecimal& num) const;
    [[nodiscard]] BigDecimal Div(const BigDecimal& num, const Precision& prec) const;
 
    bool operator==(const BigDecimal& num) const;
 
    bool operator!=(const BigDecimal& num) const;
 
    bool operator>(const BigDecimal& num) const;
 
    bool operator<(const BigDecimal& num) const;
 
    bool operator>=(const BigDecimal& num) const;
 
    bool operator<=(const BigDecimal& num) const;
 
    [[nodiscard]] BigDecimal SetScale(int scale, RoundType round_type = RoundType::RoundHalfUp) const;
 
    [[nodiscard]] BigDecimal Neg() const;
 
    static bool IsValidDecimal(const char* expr);
 
    [[nodiscard]] std::string ToStr() const;
 
    [[nodiscard]] std::string ToStr(int scale, RoundType round_type) const;
 
  private:
    int Compare(const BigDecimal& num) const;
    static void SetDefaultContext(mpd_context_t* ptr_ctx);
 
  private:
    mpd_t* ptr_data_;
};
 
} // namespace decimal_t
} // namespace ssgx
 
#endif // SAFEHERON_SGX_TRUSTED_DECIMAL_H