Re: [Boost-users] [Move] unique_ptr with boost vector container (C++98)

Subject: Re: [Boost-users] [Move] unique_ptr with boost vector container (C++98)
From: Gene Kang (gene.kang_at_[hidden])
Date: 2017-05-29 06:03:11

Thanks Ion for the clarification and workaround.

> On May 28, 2017, at 4:02 PM, Ion Gaztañaga via Boost-users <boost-users_at_[hidden]> wrote:
> 
> On 27/05/2017 21:43, Gene Kang via Boost-users wrote:
>> 
>> I’m using boost::movelib::unique_ptr with a polymorphic container of
>> type boost::container::vector and getting a compiler error that I
>> can’t seem to figure out (see code sample and attached compiler
>> output).  Note, this error occurs when compiling without C++11
>> support w/ x86-64 gcc 4.9.3.  When compiling w/ C++11 support (e.g.
>> -std=c++11) the code compiles fine.  Any ideas ? Thanks in advance
>> for any help on this.
> 
> Move emulation in C++98 does not support automatic conversions from derived to base classes.
> 
> Try converting to FooAPtr first:
> 
> #include <boost/move/unique_ptr.hpp>
> #include <boost/container/vector.hpp>
> 
> class FooA
> {
> public:
>    FooA() {}
> 
>    virtual ~FooA() {}
> 
>    virtual void execute() {}
> };
> 
> class FooB : public FooA
> {
> public:
>    FooB() {}
> 
>    virtual void execute() {}
> };
> 
> int main()
> {
>    typedef boost::movelib::unique_ptr<FooA> FooAPtr;
>    typedef boost::movelib::unique_ptr<FooB> FooBPtr;
> 
>    boost::container::vector<FooAPtr> fooVector;
> 
>    FooBPtr fooBPtr(new FooB);
>    FooAPtr fooAPtr(boost::move(fooBPtr));
> 
>    fooVector.push_back(boost::move(fooAPtr));
> 
>    return 0;
> }
> 
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