Re: [Boost-users] [Fusion] Associative Sequence not so associative

Subject: Re: [Boost-users] [Fusion] Associative Sequence not so associative
From: TONGARI (tongari95_at_[hidden])
Date: 2013-01-29 07:25:35

Hi Joel,

2013/1/29 Joel de Guzman <djowel_at_[hidden]>

> On 1/29/13 5:36 PM, TONGARI wrote:
>
>> Hi,
>>
>> I'd expect the associative sequence could be constructed and assigned with
>> another sequence in different order.
>> But it doesn't work, the src sequence must in the same order as the
>> dst sequence defined.
>> E.g. map<pair<K1, int>, pair<K2, int> > cannot take make_map<K2, K1>(1,
>> 2).
>>
>> This is a bit disappointing :-(
>>
>
> Yep. It's the way it is currently. I might be reworking maps though
> so I'll keep this use-case in mind with the update.
>

Thanks for your attention :)
Now I'm thinking if we could have these:

mapping(dst, src) // all the intersected
left_mapping(dst, src) // requires dst <= src
right_mapping(dst, src) // requires dst >= src
full_mapping(dst, src) // requires equivalence