wrapping_integers.hh

Go to the documentation of this file.

#ifndef SPONGE_LIBSPONGE_WRAPPING_INTEGERS_HH
#define SPONGE_LIBSPONGE_WRAPPING_INTEGERS_HH
 
#include <cstdint>
#include <ostream>
 
class WrappingInt32 {
  private:
    uint32_t _raw_value;  
 
  public:
    explicit WrappingInt32(uint32_t raw_value) : _raw_value(raw_value) {}
 
    uint32_t raw_value() const { return _raw_value; }  
};
 
WrappingInt32 wrap(uint64_t n, WrappingInt32 isn);
 
uint64_t unwrap(WrappingInt32 n, WrappingInt32 isn, uint64_t checkpoint);
 
 
inline int32_t operator-(WrappingInt32 a, WrappingInt32 b) { return a.raw_value() - b.raw_value(); }
 
inline bool operator==(WrappingInt32 a, WrappingInt32 b) { return a.raw_value() == b.raw_value(); }
 
inline bool operator!=(WrappingInt32 a, WrappingInt32 b) { return !(a == b); }
 
inline std::ostream &operator<<(std::ostream &os, WrappingInt32 a) { return os << a.raw_value(); }
 
inline WrappingInt32 operator+(WrappingInt32 a, uint32_t b) { return WrappingInt32{a.raw_value() + b}; }
 
inline WrappingInt32 operator-(WrappingInt32 a, uint32_t b) { return a + -b; }
 
#endif  // SPONGE_LIBSPONGE_WRAPPING_INTEGERS_HH