CODEWITHSUNDEEP
c++stdstring
Boaz
Boaz

Reputation: 5084

converting from std::string to uint8

referring to the beautiful solutions provided here, Convert string to int with bool/fail in C++,

I would like to cast a std::string to a 8 bit number (unsigned or signed) The problem is that because 8 bit number is represented as a char so it is parsed wrong
(trying to parse anything above 1 digits - like 10 - fails)

Any ideas?

Upvotes: 0

Views: 9008

Answers (2)

Shawnone
Shawnone

Reputation: 860

Use template specialization:

template <typename T>
void Convert(const std::string& source, T& target)
{
    target = boost::lexical_cast<T>(source);
}

template <>
void Convert(const std::string& source, int8_t& target)
{
    int value = boost::lexical_cast<int>(source);

    if(value < std::numeric_limits<int8_t>::min() || value > std::numeric_limits<int8_t>::max())
    {
        //handle error
    }
    else
    {
        target = (int8_t)value;
    }
}

Upvotes: 4

swegi
swegi

Reputation: 4112

Parse the number as int and then cast it to uint8_t. You may perform bound checks as well.

Upvotes: 1

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