std::string::push_back vs. std::string::operator+=

[Matthias Käppler]

Hi,

I just browsed libstdc++6-doc and stumbled over a string operation I haven't
noticed before: string::push_ba ck.
If for example I want to append single characters to an std::string, which
one would be better, or is there any difference at all:

mystr.push_back ( c );

or

mystr += c;

Any ideas? I used to use the latter one.

Regards,
Matthias

[Rob Williscroft]

Re: std::string::pu sh_back vs. std::string::op erator+=

Matthias Käppler wrote in news:cntj5d$ooa $03$1@news.t-online.com in
comp.lang.c++:
[color=blue]
> Hi,
>
> I just browsed libstdc++6-doc and stumbled over a string operation I
> haven't noticed before: string::push_ba ck.[/color]

push_back() is there so that std::string conforms as "Back
Insertion Sequence".

Because its there you can use std::back_inser ter with std::string
for example. Or any other generic algorithm that requires a back
insertion sequence.
[color=blue]
> If for example I want to append single characters to an std::string,
> which one would be better, or is there any difference at all:
>
> mystr.push_back ( c );
>
> or
>
> mystr += c;
>
> Any ideas? I used to use the latter one.
>[/color]

Whichever you want, they both do the same thing.

Rob.
--

http://www.victim-prime.dsl.pipex.com/

[Jonathan Mcdougall]

Re: std::string::pu sh_back vs. std::string::op erator+=

> I just browsed libstdc++6-doc and stumbled over a string operation I haven't[color=blue]
> noticed before: string::push_ba ck.
> If for example I want to append single characters to an std::string, which
> one would be better, or is there any difference at all:
>
> mystr.push_back ( c );
>
> or
>
> mystr += c;
>[/color]

They behave the same way but logically they do different things.
push_back() is there because std::string is a container and operator +=
it there because it's a string. The same thing with size() and length().

Jonathan