Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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Examples

The following example treats command line arguments as a sequence of numeric data:

int main(int argc, char * argv[])
{
    using boost::lexical_cast;
    using boost::bad_lexical_cast;

    std::vector<short> args;

    while(*++argv)
    {
        try
        {
            args.push_back(lexical_cast<short>(*argv));
        }
        catch(bad_lexical_cast &)
        {
            args.push_back(0);
        }
    }
    ...
}

The following example uses numeric data in a string expression:

void log_message(const std::string &);

void log_errno(int yoko)
{
    log_message("Error " + boost::lexical_cast<std::string>(yoko) + ": " + strerror(yoko));
}

Following example converts some number and puts it to file:

int i;
FILE* file;
...
typedef boost::array<char, 50> buf_t; // You can use std::array if your compiler supports it
buf_t buffer = boost::lexical_cast<buf_t>(i); // No dynamic memory allocation
puts(buffer.begin(), file);

Following example takes part of the string and converts it to int:

int convert_strings_part(const std::string& s, std::size_t pos, std::size_t n)
{
    return boost::lexical_cast<int>(s.data() + pos, n);
}


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