Re: A couple of questions about strings

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2 total messages Started by Beman Dawes Fri, 22 Mar 1996 02:04

#3769

Author: Beman Dawes
Date: Fri, 22 Mar 1996 02:04

26 lines
1687 bytes

 
>I'm probably beating a dead horse here, but I had a couple of
>questions about the strings class (at least, the one in the April WP).
>Specifically, there are two design decisions that I don't understand.
>
>a) Why does basic_string::copy() not also copy an ending '\0'? If
>there's some sort of good reason, why wasn't a function added that did
>this (perhaps basic_string::copy_null() or something)? I must say, it
>is very inconvenient to copy a string to a C-style array of chars with
>the current string class.

There is such a function - it is called c_str().

>b) I don't see any reason why basic_string::copy() is not a const
>function. Any particular reason for that one?

copy() is const in the current WP.


--Beman Dawes
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Re: A couple of questions about strings

#3817

Author: Rich Paul
Date: Tue, 26 Mar 1996 18:58

24 lines
1687 bytes

Beman Dawes wrote:
> 
> 
> >a) Why does basic_string::copy() not also copy an ending '\0'? If
> >there's some sort of good reason, why wasn't a function added that did
> >this (perhaps basic_string::copy_null() or something)? I must say, it
> >is very inconvenient to copy a string to a C-style array of chars with
> >the current string class.
> 
> There is such a function - it is called c_str().

well, to be equivilent, it would really be:

strncpy ( buffer, string::c_str(), x );
buffer[x] = 0;	// only if strlen(buffer > x), but it's not safe
		// to check that way, since strlening a non-termed 						
		// char[] is a bad thing
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