boost::multi_array and STL algorithms
Author
Hi,
Right now I'm iterating over the sectors in my game in the following way:
for(boost::multi_array<Sector, 2>::index i = 0; i < Depth; ++i)
for(boost::multi_array<Sector, 2>::index j = 0; j < Width; ++j)
{
Sector *pSector = &m_Sectors[j];
pSector->SaveToFile(FilePointer);
}
But I saw that boost::multi_array also has iterators. So I thought I'd write the following:
for_each(m_Sectors.begin(), m_Sectors.end(), bind2nd(mem_fun_ref(&Sector::SaveToFile), FilePointer));
But for some reason this doesn't compile.
Anyway, I thought: maybe I'll try to use the iterators manually in a loop and see what it does:
typedef boost::multi_array<Sector, 2> SECARRAY;
for(SECARRAY::iterator It = m_Sectors.begin(); It != m_Sectors.end(); ++It)
g_pLog << "Sector found!" << std::endl;
But it only iterates over the elements in one dimension! For example: if I have a 2x1 array it prints out 2 messages correctly, but if I have a 1x2 array it only prints out 1 message!
What am I doing wrong here? Am I even supposed to be able to work with the iterators of multi_array?
I'd appreciate some help,
Jeroen
The documentation tells me that the value_type (what you iterate on) is the immediately nested type of the array. Therefore, you're iterating over rows, and need a second iteration to get to the actual values in those rows.
I would suggest using array.origin() and array.origin() + array.num_elements() instead.
I would suggest using array.origin() and array.origin() + array.num_elements() instead.
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