multiple unique key in a multi index

Question

I am trying to store objects in a boost multi-index container.

These objects are all unique can be retrieved by 2 separate keys (unique as well).

namepsace bm = boost::multi_index;

class MyObj {
 string  strid_;
 int32_t numid_;
};

//! associative container searchable by ClOrdId and Sunofia Id.  
typedef boost::multi_index_container< MyObj,
bm::indexed_by<
  bm::ordered_unique<
    bm::member<MyObj,string,&MyObj::strid_>
  >,
  bm::ordered_unique<
    bm::member<MyObj,int32,&MyObj::numid_>
  >
>            
> Cntr;
Cntr cntr_;

When I try to find any element of that index by integer I use the following code

 int32_t to_find = 12;
 Cntr::iterator it = cntr_.find(id);

but it doesn't compile and I get the following error

error: invalid conversion from ‘int’ to ‘const char*’

When I use the same code with string it works fine; do you know what I am doing wrong?

Joaquín M López Muñoz · Accepted Answer · 2014-07-22T08:57:34.873

2

auto it = cntr_.get<1>().find(id);

Each index is accessed separately (via get) and has its own member functions, iterators, etc. (In case you can't use auto,it is of type Cntr::nth_index<1>::type::iterator.) More info on the doc tutorial.

edited Jul 22 '14 at 08:57

answered Jul 22 '14 at 08:08

Joaquín M López Muñoz

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Hi! Just noticed that you are the guy who created the lib!!!Ah! Good stuff indeed, tons of lines of code less to write! :) – Abruzzo Forte e Gentile Jul 22 '14 at 08:41
Glad to know it's useful :-) – Joaquín M López Muñoz Jul 22 '14 at 08:58

multiple unique key in a multi index

1 Answers1