Re: [Boost-users] BOOST_FOREACH and maps

From: Eric Niebler (eric_at_[hidden])
Date: 2006-09-18 14:37:29

Rob Caldecott wrote:
> OK, I know BOOST_FOREACH isn't part of the official (1.33.1) build yet, but 
> hopefully some people here are using this excellent algorithm and can help 
> me out... (note that I am using MS Visual Studio 2005):
> 
> How can I use BOOST_FOREACH to iterate through a map?  For example, the 
> following won't build:
> 
> std::map<int, int> m;
> BOOST_FOREACH(std::pair<int, int> p, m)
> {
> }
> 
> I get the following error:
> 
>     warning C4002: too many actual parameters for macro 'BOOST_FOREACH'
> 

This is covered in the docs:
     http://tinyurl.com/l72gp

Your solutions (pre-declare the loop variable or use a typedef) are the 
way to go.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com