BigInt/include/constructors/constructors.hpp at 2bc7e68e20c8d5941097bbdcd535dc2403a4219b · faheel/BigInt · GitHub

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/*
    ===========================================================================
    Constructors
    ===========================================================================
*/

#ifndef BIG_INT_CONSTRUCTORS_HPP
#define BIG_INT_CONSTRUCTORS_HPP

#include "BigInt.hpp"
#include "functions/utility.hpp"


/*
    Default constructor
    -------------------
*/

BigInt::BigInt() {
    magnitude = { 0 };
    is_negative = false;
}


/*
    Copy constructor
    ----------------
*/

BigInt::BigInt(const BigInt& num) {
    magnitude = num.magnitude;
    is_negative = num.is_negative;
}


/*
    Integer to BigInt
    -----------------
*/

BigInt::BigInt(const long long& num) {
    magnitude = { (unsigned long long) llabs(num) };
    is_negative = num < 0;
}


/*
    String to BigInt
    ----------------
*/

BigInt::BigInt(const std::string& num) {
    if (num[0] == '+' or num[0] == '-') {     // check for sign
        std::string num_magnitude = num.substr(1);
        if (is_valid_number(num_magnitude)) {
            magnitude = convert_to_base_64(num_magnitude);
            is_negative = num[0] == '-';
        }
        else {
            throw std::invalid_argument("Expected an integer, got \'" + num + "\'");
        }
    }
    else {      // if no sign is specified
        if (is_valid_number(num)) {
            std::string num_magnitude(num);
            magnitude = convert_to_base_64(num_magnitude);
            is_negative = false;    // positive by default
        }
        else {
            throw std::invalid_argument("Expected an integer, got \'" + num + "\'");
        }
    }
}

#endif  // BIG_INT_CONSTRUCTORS_HPP