Re: C++11: copy- and move-constructors

[Oleg Smolsky <oleg@xxxxxxxxxxx>]

On 2012-08-14 08:06, Marc Glisse wrote:
> On Tue, 14 Aug 2012, Oleg Smolsky wrote:
>
> > Hey all, I've just attempted to move my project from g++ v4.6.3 to 
> > v4.7.1 and hit an issue when using move semantics.
>
> [...]
>
> How about including a minimal testcase with your post?
That's very easy - in 42 lines :) Please see the attachment.

Oleg.

#include <memory>

namespace
{
    template <class Type>
    class LockGuard
    {
    public:
        LockGuard(Type &) {
        }
        // LockGuard(const LockGuard &) = delete;

        LockGuard(LockGuard &&) {
        }

    private:
        LockGuard(const LockGuard &);
    };

    struct Lock
    {
        LockGuard<Lock> Hold() {
            return LockGuard<Lock>(*this);
        }
    };

    struct Data
    {
    } _data;

    Lock _lock;

    std::pair<Data *, LockGuard<Lock>> lock_me() {
        return std::make_pair(&_data, _lock.Hold());
    }
}

int main(int argc, char *argv[])
{
    auto x = lock_me();
    return 0;
}