[boost] Re: static sized strings

From: John Nagle (nagle_at_[hidden])
Date: 2004-05-17 13:06:07

   With no base class for all fixed_string types, though,
there's no way to pass fixed_string objects around, short
of templating every function that uses them.

   A base class seems to be needed.  Otherwise, there's
no direct replacement for "char *" arguments.

   Here's a simple test program.  It should be possible
to do the common operations done here.  That doesn't
seem possible with the latest version in the Boost
sandbox.

                        John Nagle
                        Animats

====

static void printstring(const char_string_base& str)
{
        printf("Printing from a function: %s\n",str.c_str());
}

static void editstring(char_string_base& str,float val)
{	sprintf(str,"F = %f\n",val);	}

int maindunn()
{
        //	String test
        char_string<80> s1;
        char_string<10> s2;
        s1.copy("This is a test");
        printf("Hello: %s\n",s1.c_str());
        sprintf(s1,"N=%d\n",100);
        s2.copy(s1);
        printf("Printing with printf directly: %s",s2.c_str());
        editstring(s2,100);	// This overflows the string.
        printstring(s2);	
}

                        John Nagle

Reece Dunn wrote:

> John Nagle wrote:
> 
>>  That's an older version, though; the strings have
>> no length field, and you said you were putting one in.
>> Should I do that?
> 
> 
> I have been busy with other things. I have finally gotten around to 
> updating the code, which now includes:
> *  internal length tracking
> *  null-termination as a given (i.e. it will no longer work in data 
> structure headers for signature checking, etc.)
> *  safe_strings.hpp uses your strategy of putting the C-string functions 
> in the global namespace (I would have liked a better approach to this).
> 
>   #include <boost/fixed_string/safe_strings.hpp>
>   // ...
>   boost::char_string< 15 >    cstr;
>   strcpy( cstr, "Meine Grosse Welt!" );
>   std::cout << cstr << '\n';
> 
>   sprintf( cstr, "Hello %d Worlds!", 10 );
>   std::cout << cstr << '\n';
> 
> Results in:
>   Meine Grosse W
>   Hello 10 World
> 
> Regards,
> Reece
> 
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