[..]
I threw together something similar to what you have and it *doesn't*
appear to be working.
16:15:35 Paul Bibbings@JIJOU
/cygdrive/d/CPPProjects/CLCPP $cat vector_mask.cpp
// file: vector_mask.cpp
#include<vector>
#include<algorithm>
#include<iostream>
template<typename T>
class MaskFunctor {
public:
explicit MaskFunctor(std::vector<bool>& mask)
: mask_(mask)
, mask_iter_(mask_.begin())
{ }
bool operator()(const T&)
{
if (mask_iter_ == mask_.end())
return false;
else
return *mask_iter_++;
}
private:
std::vector<bool>& mask_;
std::vector<bool>::const_iterator mask_iter_;
};
int main()
{
std::vector<bool> mask;
for (int i = 0; i< 4; ++i)
{
mask.push_back(true);
mask.push_back(false);
}
std::vector<int> i_vec;
for (int i = 0; i< 8; ++i)
i_vec.push_back(i);
std::vector<int>::iterator end =
std::remove_if(i_vec.begin(), i_vec.end(),
MaskFunctor<int>(mask));
i_vec.erase(end, i_vec.end());
for (std::vector<int>::const_iterator ci = i_vec.begin();
ci != i_vec.end();
++ci)
{
std::cout<< *ci<< ' ';
}
std::cout<< '\n';
}
16:15:41 Paul Bibbings@JIJOU
/cygdrive/d/CPPProjects/CLCPP $./vector_mask
2 4 6
The implementation makes a copy of the predicate. It's important that
the predicate keeps the iterator by reference. Try rewriting it with