hex.cc

/** @arg what: any number
 * @return: string number represented as hex */
template <typename T, std::endian endianess = std::endian::native>
std::string HEX__1(const T& value, size_t value_size = sizeof(T))
{
    using namespace std;
    uint8_t *buffer = (uint8_t*)(&value);
    char converted[value_size * 2 + 1];
    if (endianess == std::endian::big)
        for(size_t i = 0; i < value_size; ++i) {
            sprintf(&converted[i*2], "%02X", buffer[i]);
        }
    else
        for(size_t i = 0; i < value_size; ++i) {
            sprintf(&converted[i*2], "%02X", buffer[value_size-1-i]);
        }
    return converted;
}


void main1 () {
    using namespace std;
    {
        uint8_t a = 0x10;
        cout<<HEX__1(a)<<endl;
        if (HEX__1(a) != "10") throw std::runtime_error("");
    }{
        int32_t a = -128;
        cout<<HEX__1(a)<<endl;
        if (HEX__1(a) != "FFFFFF80") throw std::runtime_error("");
    }{
        uint64_t a = 0x0000000000000102;
        cout<<HEX__1(a)<<endl;
        if (HEX__1(a) != "0000000000000102") throw std::runtime_error("");
    }{
        double a = 1;
        cout<<HEX__1(a)<<endl;
        if (HEX__1(a) != "3FF0000000000000") throw std::runtime_error("");
    }
    cout<<"------------------"<<endl;
    {
        uint64_t a = 0;
        cout<<HEX__1(a)<<endl;
        if (HEX__1(a) != "0000000000000000") throw std::runtime_error("");
    }
}


int main() {
    main1();
    return 0;
}