problems with boot::multi_array and standard algorithms
I cant get boost::multi_array to wrk with STL algorithms. In particular
boost::multi_array
Hi Donald, On Feb 1, 2005, at 4:50 PM, Donald Johnson wrote:
I cant get boost::multi_array to wrk with STL algorithms. In particular
boost::multi_array
test_array( boost::extents[10][10] ); std::fill(test_array.begin(),test_array.end(),1); gives me the following compile errors.
...
Do the provided iterators not work for stl algorithms?
Yes they do, but not in the manner that you think they do :). In the code above, you are creating a 2 dimensional array. Calling begin() on your array results in an iterator over the /one-dimensional arrays/ contained therein. Your code is trying to assign scalar values to one-dimensional arrays, hence the type error. You can get the effect that you are going for as follows. std:: fill(test_array.data(),test_array.data()+test_array.num_elements(),1); Hope this helps! ron
G'day all.
Quoting Ronald Garcia
Yes they do, but not in the manner that you think they do :). In the code above, you are creating a 2 dimensional array. Calling begin() on your array results in an iterator over the /one-dimensional arrays/ contained therein. Your code is trying to assign scalar values to one-dimensional arrays, hence the type error. You can get the effect that you are going for as follows.
std:: fill(test_array.data(),test_array.data()+test_array.num_elements(),1);
Which reminds me of a question I've been meaning to ask... Any tips for dimension-independent programming with boost::multi_array? In particular, it would be really nice to be able to iterate over the elements in multi_array in such a way that the iterator also keeps track of the index. (This is for a real-world problem; I need to solve Poisson-esque problems on regular grids, and it would be handy if I could get it happening in either 2D or 3D by changing one template argument.) Cheers, Andrew Bromage
participants (3)
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ajb@spamcop.net
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Donald Johnson
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Ronald Garcia