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Re: String and std::string
- From: Pavel Tsekov <ptsekov at gmx dot net>
- To: Alex Tibbles <alex_tibbles at yahoo dot co dot uk>
- Cc: cygwin-apps at cygwin dot com
- Date: Fri, 21 Mar 2003 13:48:22 +0100 (CET)
- Subject: Re: String and std::string
On Fri, 21 Mar 2003, Alex Tibbles wrote:
> > I don't care whether you use std::string, or
> > String++ for any new code,
> > as long as:
> > 1) You don't leak memory (std::string will leak if
> > you use c_str())
> > IIRC.
> I've been unable to confirm this. I tried the attached
> program (compiled with gcc -lstdc++ stringleak.cpp)
> and got the following results from top:
> PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM
> 648 alex 14 0 556 556 416 R 56.2 0.2
> TIME COMMAND
> 3:02 a.out
> Am I correct in concluding that std::string::c_str()
> does not leak? I'm interested as I use c_str() a fair
> amount for interfacing C++ with C (I believe that was
> what it was designed for, but I'm only guessing).
There is no need to prove that - it doesn't leak according to the
standard. Of course there may have been some faulty implementations
that actually leak.
>From the "C++ Programming Language" by Bjarne Stroustrup:
"The data() function writes the characters of the string into an array
and returns a pointer to that array. The array is owned by the string, and
the user should not try to delete it."
c_str() is similiar .