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#pragma once
#include <cstddef>
#include <initializer_list>
#include <vector>
namespace linalg {
class Vector {
public:
Vector() = default;
explicit Vector(std::size_t n);
Vector(std::size_t n, double value);
Vector(std::initializer_list<double> values);
[[nodiscard]] std::size_t size() const noexcept;
[[nodiscard]] bool empty() const noexcept;
double& operator[](std::size_t i);
const double& operator[](std::size_t i) const;
void fill(double value);
double* data() noexcept;
const double* data() const noexcept;
auto begin() noexcept { return data_.begin(); }
auto end() noexcept { return data_.end(); }
auto begin() const noexcept { return data_.begin(); }
auto end() const noexcept { return data_.end(); }
auto cbegin() const noexcept { return data_.cbegin(); }
auto cend() const noexcept { return data_.cend(); }
private:
void check_index(std::size_t i) const;
std::vector<double> data_;
};
Vector operator+(const Vector& lhs, const Vector& rhs);
Vector operator-(const Vector& lhs, const Vector& rhs);
Vector operator*(const Vector& v, double scalar);
Vector operator*(double scalar, const Vector& v);
Vector operator/(const Vector& v, double scalar);
double dot(const Vector& lhs, const Vector& rhs);
} // namespace linalg
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