Re: [Boost-users] How to use if_then in boost::bind library

On 2/24/06, yinglcs2@yahoo.com wrote:

Hi,

I have the code which copy from a STL list to another if a condition is met:

list alist;

for (list::iterator iter = alist.begin(); iter != alist.end(); ++iter) {

A* a = (*iter);

if ( a->aFunc( i, j) { destList.push_back(a); } }

I try doing this, but it does not compile:

for_each(alist.begin(), alist.end(), if_then( bind(&A::aFunc, _1 , i, j ), columnBlocks.push_back(_1)));

There are my errors:

error: no matching function for call to 'std::vector

...

::push_back(const boost::lambda::lambda_functor &) error: 'if_then' was not declared in this scope

1. Have you included the correct header (boost/lambda/if.hpp). 2. You'll have to bind the push_back call as well: bind(&list::push_back, columnBlocks, _1) HTH Stuart Dootson