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evector.h
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139 lines (114 loc) · 2.91 KB
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#ifndef COOL_THINGS_EVECTOR_H
#define COOL_THINGS_EVECTOR_H
#include <stddef.h>
#include <cassert>
#include <vector>
#include <iostream>
template <typename E>
class vec_expression
{
public:
auto size() const
{ return static_cast<E const&>(*this).size(); }
auto operator[](size_t i) const
{ return static_cast<E const&>(*this)[i]; }
explicit operator E&()
{ return static_cast< E&>(*this); }
explicit operator E const&() const
{ return static_cast<const E&>(*this); }
};
class vec : public vec_expression<vec>
{
std::vector<double> data_;
public:
auto operator[](size_t i)
{ return data_[i]; }
auto operator[](size_t i) const
{ return data_[i]; }
auto size() const
{ return data_.size(); }
explicit vec(size_t n) : data_(n)
{ }
explicit vec(std::initializer_list<double> elements) : data_(elements)
{ }
template <typename E>
vec(vec_expression<E> const& vec)
{
E const& v = static_cast<E const&>(vec);
data_.resize(v.size());
for (size_t i = 0; i != v.size(); ++i)
{
data_[i] = v[i];
}
}
};
std::ostream& operator<<(std::ostream& os, vec const& v)
{
os << "[ ";
for (size_t i = 0; i < v.size(); ++i)
os << v[i] << " ";
os << "]";
return os;
}
template <typename E1, typename E2>
class vec_difference : public vec_expression<vec_difference<E1, E2>>
{
E1 const& u_;
E2 const& v_;
public:
vec_difference(vec_expression<E1> const& u, vec_expression<E2> const& v) : u_(u), v_(v)
{
assert(u.size() == v.size());
}
auto size() const
{ return v_.size(); }
auto operator[](size_t i) const
{ return u_[i] - v_[i]; }
};
template <typename E1, typename E2>
class vec_sum : public vec_expression<vec_sum<E1, E2>>
{
E1 const& u_;
E2 const& v_;
public:
vec_sum(vec_expression<E1> const& u, vec_expression<E2> const& v) : u_(u), v_(v)
{
assert(u.size() == v.size());
}
auto size() const
{ return v_.size(); }
auto operator[](size_t i) const
{ return u_[i] + v_[i]; }
};
template <typename E>
class vec_scaled : public vec_expression<vec_scaled<E>>
{
double alpha_;
E const& v_;
public:
vec_scaled(double alpha, vec_expression<E> const& v) : alpha_(alpha), v_(v)
{ }
auto size() const
{ return v_.size(); }
auto operator[](size_t i) const
{ return alpha_ * v_[i]; }
};
template <typename E1, typename E2>
vec_difference<E1, E2> const
operator-(vec_expression<E1> const& u, vec_expression<E2> const& v)
{
return vec_difference<E1, E2>(u, v);
}
template <typename E1, typename E2>
vec_sum<E1, E2> const
operator+(vec_expression<E1> const& u, vec_expression<E2> const& v)
{
return vec_sum<E1, E2>(u, v);
}
template <typename E>
vec_scaled<E> const
operator*(double alpha, vec_expression<E> const& v)
{
return vec_scaled<E>(alpha, v);
}
#endif //COOL_THINGS_EVECTOR_H