[C++] Czy to jest lagalne?

Article View: pl.comp.lang.c

Article #309551

#309551

From: Wojciech Muła
Date: Thu, 28 Dec 2017 11:11

34 lines
1500 bytes

Normalne kompilatory (GCC 7/clang 5) nie protestują.
Czy ten kod jest legalny? Chodzi o castowanie w capture().

--start--
#include <string>

class Item {

protected:
	std::string a;
};

class Builder: public Item {
	
public:
	void set() {
		a = "foo";
	}
	
	Item&& capture() {
		return std::move(*this);
	}
};

int main() {

    Builder b;
    b.set();

    Item a = b.capture();
}
--stop--

w.

Technical Details

Message-ID: <f928db02-1940-40f1-95e9-241cc8966ed7@googlegroups.com>

Path:

mbox-mo1.pugleaf.net!news-archive.icm.edu.pl!news.icm.edu.pl!fu-berlin.de!m31no2974331qtf.0!news-out.google.com!t48ni1024qtc.1!nntp.google.com!m31no2974328qtf.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail

Show Full Headers

Complete Article Headers

X-Received: by 10.55.18.90 with SMTP id c87mr22371941qkh.43.1514459494121;        Thu, 28 Dec 2017 03:11:34 -0800 (PST)
X-Received: by 10.31.165.202 with SMTP id o193mr2873899vke.9.1514459493819; Thu, 28 Dec 2017 03:11:33 -0800 (PST)
Path: mbox-mo1.pugleaf.net!news-archive.icm.edu.pl!news.icm.edu.pl!fu-berlin.de!m31no2974331qtf.0!news-out.google.com!t48ni1024qtc.1!nntp.google.com!m31no2974328qtf.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: pl.comp.lang.c
Date: Thu, 28 Dec 2017 03:11:33 -0800 (PST)
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=131.228.32.167; posting-account=VFwkXwoAAADdT4-lLKRZrMYkTjizGoyn
NNTP-Posting-Host: 131.228.32.167
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <f928db02-1940-40f1-95e9-241cc8966ed7@googlegroups.com>
Subject: [C++] Czy to jest lagalne?
From: Wojciech Muła <wojciech_mula@poczta.onet.pl>
Injection-Date: Thu, 28 Dec 2017 11:11:34 +0000
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit