From: Joel (joel_at_[hidden])
Date: 2005-01-06 19:04:38
Aleksey Gurtovoy wrote:
> Joel writes:
>>write a lambda expression that accepts:
>> 1. a 2-dimensional container (e.g. vector<vector<int> >)
>> 2. a container element (e.g. int)
>>and pushes-back the element to each of the vector<int>.
>> lambda(_a = _2)
>> push_back(_1, _a)
>>Since we do not have access to the arguments of the outer scopes
>>beyond the lambda-body, we introduce a local variable _a that
>>captures the second outer argument: _2. Hence: _a = _2. This
>>local variable is visible inside the lambda scope.
> Any particular reason why you decided against implicit scoping along
> the lines of
> for_each( _1, push_back(_1, outer(_2)) )
Actually, both solutions are orthogonal. I still have the
code for "outer". I just don't have it documented yet.
-- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net
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