Re: [Boost-users] [lambda] Correct way to use lamda with boost.array?

From: Sohail Somani (s.somani_at_[hidden])
Date: 2006-08-09 19:20:42

Hi,

I've had the same problems (with vectors of arrays). Unfortunately, the only workaround I've found is (for example):

for_each(b,e,lambda::ret<T&>(_1[0])=5);

It sometimes makes the lines really long, for example if you're doing a sort based on different columns of your table, but its still better than the alternative (syntatically)

-----Original Message-----
From: boost-users-bounces_at_[hidden] on behalf of Michael Marcin
Sent: Wed 8/9/2006 12:10 PM
To: boost-users_at_[hidden]
Subject: [Boost-users] [lambda] Correct way to use lamda with boost.array?
 
What is the proper syntax for using lamda with with array?

i.e. how do I do something like

namespace lambda = ::boost::lambda;

boost::array< boost::array<int,2>, 4 > foo = {{ {-1,1}, {0,0}, {1,-1}, 
{2,-2} }};

std::for_each( foo.begin(), foo.end(),  std::cout
    << lambda::constant( "first = " ) << lambda::_1[0] << ' '
    << lambda::constant( "second =  " ) << lambda::_1[1] << '\n' );

Thanks 

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