[Boost-users] multi_index with base class member

[david joeyoung]

please give me some advices.

I get a compile error,when to index on base class member.

the codes are listed below:

struct Foo 

{ 

int a; 

}; 

 

struct Bar : public Foo 

{ 

int b;

}; 

struct idx0 {};

typedef multi_index_container<

Bar,

indexed_by<

 ordered_unique<

tag < idx0 > ,member < Bar,int,&Bar::a> 

 >

>

> test_type;

Error 1 error C2440: 'specialization' : cannot convert from 'int Foo::* ' to 'int Bar::* '

and the codes are compiled in boost 1.40, vs 2008 sp1

[Steven Watanabe]

AMDG

david joeyoung wrote:
> please give me some advices.
>
> I get a compile error,when to index on base class member.
>
> the codes are listed below:
>
> struct Foo
> {
> int a;
> };
>
> struct Bar : public Foo
> {
> int b;
> };

> <snip>
> member < Bar,int,&Bar::a>
> <snip>

>
> Error 1 error C2440: 'specialization' : cannot convert from 'int Foo::* ' to
> 'int Bar::* '
> and the codes are compiled in boost 1.40, vs 2008 sp1
>

You can use the base class in member:

member<Foo, int, &Bar::a>

In Christ,
Steven Watanabe

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