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Subject: Re: [boost] [operators] The future of Boost.Operators
From: Jeffrey Lee Hellrung, Jr. (jeffrey.hellrung_at_[hidden])
Date: 2013-04-25 14:40:13

On Thu, Apr 25, 2013 at 11:03 AM, Marc Glisse <marc.glisse_at_[hidden]> wrote:

> On Thu, 25 Apr 2013, Jeffrey Lee Hellrung, Jr. wrote:
> T& a = b + c;
>>>> you'll get a compiler error with (A) or (B) and a runtime error with
>>>> (C).
>>> Er, no. That might be true with Microsoft's compiler and its extra
>>> "features", but regular compilers will complain:
>>> error: invalid initialization of non-const reference of type 'T&' from an
>>> rvalue of type 'T'
>> Are you sure we're talking about the same thing? This looks like the kind
>> of error that (A) or (B) would produce; would not (C) say something like
>> invalid initialization of non-const reference of type 'T&' from type 'T&&'
>> ???
>> I swear I just tried a T& y = static_cast<T&&>(x) on gcc and finding it
>> compiled fine.
> I just tried to compile this program with g++ -std=c++0x -Wall -c
> for versions of gcc: 4.4, 4.6, 4.7, and 4.9 and they all rejected it with
> pretty much the same error message. I don't understand what the difference
> can be with your tests :-(
> struct A{};
> void f(){
> A a;
> A&r=static_cast<A&&>(a);
> }
> And for the record, clang++'s error message:
> error: non-const lvalue reference to type 'A' cannot bind to a temporary
> of type 'A'

Yeah I probably tried it too quickly and screwed something up; I get errors
now. Thanks for setting me straight!

- Jeff

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