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#pragma once
namespace mm::iter {
template<typename T, std::size_t Rows, std::size_t Cols, class IterType, class Grid>
class vector_iterator;
template<typename T, std::size_t Rows, std::size_t Cols, class Grid>
class basic_iterator;
template<typename T, std::size_t N, class Grid>
class diag_iterator;
}
template<typename T, std::size_t Rows, std::size_t Cols, class IterType, class Grid>
class mm::iter::vector_iterator
{
public:
template<typename U, std::size_t R, std::size_t C, class G>
friend class mm::iter::basic_iterator;
template<typename U, std::size_t N, class G>
friend class mm::iter::diag_iterator;
vector_iterator(Grid& _M, std::size_t pos, std::size_t i = 0)
: M(_M), position(pos), index(i) {}
operator T&()
{
return *(*this);
}
IterType operator++()
{
IterType it = *this;
++index;
return it;
}
IterType operator--()
{
IterType it = *this;
--index;
return it;
}
IterType& operator++(int)
{
++index;
return *this;
}
IterType& operator--(int)
{
--index;
return *this;
}
bool operator==(const IterType& other) const
{
return index == other.index;
}
bool operator!=(const IterType& other) const
{
return index != other.index;
}
virtual bool ok() const = 0;
virtual T& operator*() = 0;
virtual T& operator[](std::size_t) = 0;
IterType begin()
{
return IterType(M, position, 0);
}
virtual IterType end() = 0;
/*
* Scalar product
*/
template<std::size_t P>
T operator*(const mm::iter::vector_iterator<T, Rows, P, IterType, Grid>& v)
{
T out(0);
for (unsigned k(0); k < Rows; ++k)
out += (*this)[k] * v[k];
return out;
}
template<std::size_t P>
T operator*(const mm::iter::vector_iterator<T, P, Cols, IterType, Grid>& v)
{
T out(0);
for (unsigned k(0); k < Cols; ++k)
out += (*this)[k] * v[k];
return out;
}
protected:
Grid& M; // grid mapping
const std::size_t position; // fixed index, negative too for diagonal iterator
std::size_t index; // variable index
};
template<typename T, std::size_t Rows, std::size_t Cols, class Grid>
class mm::iter::basic_iterator : public mm::iter::vector_iterator<T, Rows, Cols, mm::iter::basic_iterator<T, Rows, Cols, Grid>, Grid>
{
bool direction;
public:
basic_iterator(Grid& A, std::size_t pos, std::size_t _index = 0, bool dir = true)
: mm::iter::vector_iterator<T, Rows, Cols, mm::iter::basic_iterator<T, Rows, Cols, Grid>, Grid>
(A, pos, _index), direction(dir)
{
if (direction)
assert(pos < Rows);
else
assert(pos < Cols);
}
virtual bool ok() const override
{
return (direction) ? this->index < Cols : this->index < Rows;
}
virtual T& operator*() override
{
return (direction) ?
this->M.data[this->position * Cols + this->index] :
this->M.data[this->index * Cols + this->position];
}
virtual T& operator[](std::size_t i) override
{
return (direction) ?
this->M.data[this->position * Cols + i] :
this->M.data[i * Cols + this->position];
}
virtual mm::iter::basic_iterator<T, Rows, Cols, Grid> end()
{
return mm::iter::basic_iterator<T, Rows, Cols, Grid>(this->M, this->position,
(direction) ? Cols : Rows);
}
};
template<typename T, std::size_t N, class Grid>
class mm::iter::diag_iterator : public mm::iter::vector_iterator<T, N, N, mm::iter::diag_iterator<T, N, Grid>, Grid>
{
bool sign;
public:
diag_iterator(Grid& A, signed long pos, std::size_t _index = 0)
: mm::iter::vector_iterator<T, N, N, mm::iter::diag_iterator<T, N, Grid>, Grid>
(A, static_cast<std::size_t>(abs(pos)), _index), sign(pos >= 0)
{
assert(this->position < N);
}
virtual bool ok() const
{
return this->index < N;
}
virtual T& operator*() override
{
return (sign) ?
this->M.data[(this->index - this->position) * N + this->index] :
this->M.data[this->index * N + (this->index + this->position)];
}
virtual T& operator[](std::size_t i) override
{
return (sign) ?
this->M.data[(i - this->position) * N + i] :
this->M.data[i * N + (i + this->position)];
}
virtual mm::iter::diag_iterator<T, N, Grid> end()
{
return mm::iter::diag_iterator<T, N, Grid>(this->M, this->position, N);
}
};
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