Re: Cast operation or string conversion?

From:

Victor Bazarov <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Wed, 09 Jul 2008 16:41:59 -0400

Message-ID:

<g537qo$p69$1@news.datemas.de>

Giuseppe:G: wrote:

Hi Victor, thanks. Please find my replies below.

Victor Bazarov wrote:

A pair of size_t objects is *most likely* bigger than an unsigned int.
You cannot dynamic_cast anything except pointers to polymorphic
classes. That means the approach you're describing is not going to work.

I would say convert your tuple into a string using hexadecimal or some
other notation and pass the pointer to that string to your 'observe'
function.

Would you be so kind to show me a practical example on how I achieve this?

Something like

     #include <string>
     #include <sstream>
     #include <limits>
     #include <iomanip>
     #include <iostream>
     #include <ostream>

     std::string to_string(std::size_t one, std::size_t two)
     {
         std::ostringstream os;
         std::streamsize size = std::numeric_limits<size_t>::digits / 4;
         os << std::hex << std::setw(size) << std::setfill('0') << one;
         os << std::hex << std::setw(size) << std::setfill('0') << two;
         return os.str();
     }

     int main()
     {
        std::size_t one = 0x123, two = 0xabc;
        std::cout << to_string(one, two) << std::endl;
     }

[..]

V
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