Re: [boost] Movable but not copyable bug?

Subject: Re: [boost] Movable but not copyable bug?
From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2014-08-25 18:23:23

El 25/08/2014 23:23, Peter Dimov escribió:
> Ion Gaztañaga wrote:
>
>> Maybe you should design your code in C++11 and port it to Boost.Move,
>> you might get better compiler help.
>
> His code compiles in C++11, as is.
>
>> If this copy constructor is instantiated, and in many compilers
>>
>>    Bar<Foo> b(( Bar<Foo>() ));
>>
>> requires the copy constructor, then you get a compilation error. Just
>> try this equivalent (but more inefficient) code:
>>
>>    Bar<Foo> a;
>>    Bar<Foo> b(a);
>
> This is not equivalent. a is an lvalue here. In the above code,
> Bar<Foo>() is an rvalue. It should use the move constructor, not the
> copy constructor.

Yes, but he is compiling in C++03, that's why he's getting:

error: passing ‘const Foo’ as ‘this’ argument of ‘Foo::operator 
boost::rv<Foo>&()’ discards qualifiers [-fpermissive]

In C++03 both will require the copy constructor (I think).

Best,

Ion