Re: [boost] Search a vector of tuples?

Subject: Re: [boost] Search a vector of tuples?
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2012-04-12 07:13:37

On 12/04/12 10:36, Robert Jones wrote:
> On Wed, Apr 11, 2012 at 11:33 PM, Robert Dailey<rcdailey.lists_at_[hidden]>wrote:
>
>> Is there a method in the boost library to iterate a vector of boost::tuple
>> objects, comparing the 1st element in the tuple of each tuple to a value
>> that I specify? My tuple is setup like so:
>>
>> typedef boost::tuple<int, int, char const*>  Tuple;
>> typedef std::vector<Tuple>  ErrorStringMap;
>>
>> ErrorStringMap mystrings = tuple_list_of
>>     (10, "10", "ten")
>>     (20, "20", "twenty")
>>     (30, "30", "thirty")
>>     (10, "10", "ten");
>>
>> I want to search the vector of tuples and do something with every tuple
>> that has the number 10 as the first element in the tuple.
>>
>>
> *** Not Tested or Compiled ***
>
> #include<boost/range.hpp>
> #include<boost/range/adaptors/filtered.hpp>
> // ... and maybe some other range headers
> #include<boost/bind.hpp>
>
> for_each( mystrings | boost::adaptors::filtered( boost::bind( get<0>, _1 )
> == 10 ), yourAction );

You probably can't take the address of get<0>.

Also, you could remove the dependence on filtered by using find_if 
instead of for_each.