Fixed.cpp

[詳解]

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   Fixed.cpp                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: kamitsui <kamitsui@student.42tokyo.jp>     +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/04/28 17:17:36 by kamitsui          #+#    #+#             */
/*   Updated: 2025/05/06 17:10:39 by kamitsui         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "Fixed.hpp"
#include <cmath>
#include <iostream>
#include <limits>
 
const int Fixed::fractionalBits; // Definition of the static member
 
Fixed::Fixed() : fixedPointValue(0) {}
 
Fixed::Fixed(const int raw) : fixedPointValue(raw << fractionalBits) {}
 
Fixed::Fixed(const float raw) : fixedPointValue(static_cast<int>(roundf(raw * (1 << fractionalBits)))) {}
 
Fixed::Fixed(const Fixed &other) : fixedPointValue(other.fixedPointValue) {}
 
Fixed &Fixed::operator=(const Fixed &other) {
    if (this != &other) {
        this->fixedPointValue = other.fixedPointValue;
    }
    return *this;
}
 
Fixed::~Fixed() {}
 
int Fixed::getRawBits(void) const { return this->fixedPointValue; }
 
void Fixed::setRawBits(int const raw) { this->fixedPointValue = raw; }
 
float Fixed::toFloat(void) const { return static_cast<float>(this->fixedPointValue) / (1 << fractionalBits); }
 
int Fixed::toInt(void) const { return this->fixedPointValue >> fractionalBits; }
 
std::ostream &operator<<(std::ostream &o, const Fixed &fixed) {
    o << fixed.toFloat();
    return o;
}
 
// Comparison operators
bool Fixed::operator>(const Fixed &other) const { return this->fixedPointValue > other.fixedPointValue; }
 
bool Fixed::operator<(const Fixed &other) const { return this->fixedPointValue < other.fixedPointValue; }
 
bool Fixed::operator>=(const Fixed &other) const { return this->fixedPointValue >= other.fixedPointValue; }
 
bool Fixed::operator<=(const Fixed &other) const { return this->fixedPointValue <= other.fixedPointValue; }
 
bool Fixed::operator==(const Fixed &other) const { return this->fixedPointValue == other.fixedPointValue; }
 
bool Fixed::operator!=(const Fixed &other) const { return this->fixedPointValue != other.fixedPointValue; }
 
// Arithmetic operators
Fixed Fixed::operator+(const Fixed &other) const { return Fixed(this->toFloat() + other.toFloat()); }
 
Fixed Fixed::operator-(const Fixed &other) const { return Fixed(this->toFloat() - other.toFloat()); }
 
Fixed Fixed::operator*(const Fixed &other) const { return Fixed(this->toFloat() * other.toFloat()); }
 
Fixed Fixed::operator/(const Fixed &other) const {
    if (other.fixedPointValue == 0) {
        std::cerr << "Division by zero is undefined. Returning maximum float." << std::endl;
        return Fixed(std::numeric_limits<float>::max());
    }
    return Fixed(this->toFloat() / other.toFloat());
}
 
// Increment/decrement operators
Fixed &Fixed::operator++() { // Pre-increment
    this->fixedPointValue += (1 << fractionalBits);
    return *this;
}
 
Fixed Fixed::operator++(int) { // Post-increment
    Fixed temp = *this;
    this->fixedPointValue += (1 << fractionalBits);
    return temp;
}
 
Fixed &Fixed::operator--() { // Pre-decrement
    this->fixedPointValue -= (1 << fractionalBits);
    return *this;
}
 
Fixed Fixed::operator--(int) { // Post-decrement
    Fixed temp = *this;
    this->fixedPointValue -= (1 << fractionalBits);
    return temp;
}
 
// Min/Max functions
Fixed &Fixed::min(Fixed &a, Fixed &b) { return (a < b) ? a : b; }
 
const Fixed &Fixed::min(const Fixed &a, const Fixed &b) { return (a < b) ? a : b; }
 
Fixed &Fixed::max(Fixed &a, Fixed &b) { return (a > b) ? a : b; }
 
const Fixed &Fixed::max(const Fixed &a, const Fixed &b) { return (a > b) ? a : b; }