I have a function in STL which add the 'area'
attribute of a list of Rect.
template< class T1, class T2> class add_area_per_ce nt
: public binary_function <T2, T1, T2>
{
public:
add_area_per_ce nt() { }
T2 operator() (T2 initial, T1 element) {
if (element != NULL) {
return initial + element->getAreaPerCent ();
} else {
return initial;
}
}
};
float getTotalAreaPer Cent(BlockDataL ist& bdl) {
return accumulate (bdl.begin(), bdl.end(), 0.0,
add_area_per_ce nt<BlockData*, float>());
}
Can you please tell me how can I reduce the amount of
code and use Boost bind library to achieve the same
thing?
Thank you. 1 3604 yi*****@gmail.c om wrote: template< class T1, class T2> class add_area_per_ce nt : public binary_function <T2, T1, T2> { public: add_area_per_ce nt() { }
T2 operator() (T2 initial, T1 element) { if (element != NULL) { return initial + element->getAreaPerCent (); } else { return initial; } }
};
float getTotalAreaPer Cent(BlockDataL ist& bdl) { return accumulate (bdl.begin(), bdl.end(), 0.0, add_area_per_ce nt<BlockData*, float>()); } Can you please tell me how can I reduce the amount of code and use Boost bind library to achieve the same thing?
Reduce amount of code:
- Remove ctor, it's not needed.
- Make it a struct, no public: line needed
Boost::bind isn't really a solution.
What would work is a projection iterator. That would be an iterator
wrapper
for a BlockDataList:: iterator,with an operator* that returns
m_iter->getAreaPerCent ();
In that case, you can simply call the 4-argument form of
std::accumulate .
HTH,
Michiel Salters This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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