[boost] FW: [Lambda] find_if + vector of arrays

31 Jul 2006


      Hi,

I'm forwarding this here as I didn't get a reply on the users list.
...
-----Original Message-----
From: Sohail Somani 
Sent: Tuesday, July 25, 2006 2:19 PM
To: 'boost-users@lists.boost.org'
Subject: [Lambda] find_if + vector of arrays
Hi,
Why can't lambda figure out the return type of operator[] for 
array? Does it know about vectors? I know I can fix the 
compile error by using bl::ret<double>(bl::_1[0])... But for 
obvious reasons, I'd much rather not!
#include <vector>
#include <algorithm>
#include <boost/array.hpp>
#include <boost/lambda/lambda.hpp>
int main()
{
    namespace bl=boost::lambda;
    using std::vector;
    using boost::array;
array<double,3> cpy = {1};
    vector<vector<double> > a(10,vector<double>(3,1));
    vector<array<double,3> > b(10,cpy);
std::find_if(a.begin(),a.end(),bl::_1[0]==5);
    std::find_if(b.begin(),b.end(),bl::_1[0]==5);
}
Thanks!
Sohail