hmm haven't really tested it because i just dled boost lambda_tuple in the library but if it works than somehting like std::find_if(vec_of_some_tuples.begin(), vec_of_some_tuples.end(), boost::lambda::get<0>(boost::lambda::_1) == 5); On 8/13/07, David Abrahams wrote:

on Mon Aug 13 2007, "Graham Reitz" wrote:

...

typedef boost::tuples::tuple some_tuple;

std::vector vec_of_some_tuples;

// ... stuff some data into the vector

// ... search for a specific int in the vector of some_tuple

What would be a good method, using an stl algorithm, to search through the vector above to match only the int portion of the tuple (ignoring the double)?

Use std::find with a boost::transform_iterator over a function returning the first member of the tuple, then extract the resulting iterator's base() iterator.

HTH,

-- Dave Abrahams Boost Consulting http://www.boost-consulting.com

The Astoria Seminar ==> http://www.astoriaseminar.com

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Thanks Folks! I really appreciate the help! That's just what I needed. Graham On 8/13/07, Richard Dingwall wrote:

The following appears to work (it compiles :)):

#include #include #include <vector> #include <algorithm> #include <cassert>

template inline typename boost::tuples::element::type & get(tuple_type & t) { return boost::tuples::get<N>(t); }

int main(const int argc, const char ** argv) {

typedef boost::tuples::tuple some_tuple;

std::vector vec_of_some_tuples;

std::vector::iterator result(std::find_if(vec_of_some_tuples.begin(), vec_of_some_tuples.end(), boost::bind(get<0, some_tuple>, ::_1) == 42));

assert(result != vec_of_some_tuples.end());

return 0; }

Where 42 is the item you're looking for. See this post for original get(): http://lists.boost.org/boost-users/2007/01/24529.php

Otherwise, use a map?

Richard

On 8/14/07, David Abrahams wrote:

...

on Mon Aug 13 2007, "Graham Reitz" wrote:

...

typedef boost::tuples::tuple some_tuple;

std::vector vec_of_some_tuples;

// ... stuff some data into the vector

// ... search for a specific int in the vector of some_tuple

What would be a good method, using an stl algorithm, to search through the vector above to match only the int portion of the tuple (ignoring the double)?

Use std::find with a boost::transform_iterator over a function returning the first member of the tuple, then extract the resulting iterator's base() iterator.

HTH,

-- Dave Abrahams Boost Consulting http://www.boost-consulting.com

The Astoria Seminar ==> http://www.astoriaseminar.com

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users

_______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users