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#include <iostream>
#include <cassert>
#include <array>
#include <initializer_list>
#include <algorithm>
template<typename T, std::size_t d>
class basic_vec {
public:
typedef T value_type;
typedef typename std::array<T, d>::iterator iterator;
typedef typename std::array<T, d>::const_iterator const_iterator;
static constexpr std::size_t dimensions = d;
basic_vec();
basic_vec(std::initializer_list<T> l);
template<std::size_t n>
basic_vec(const basic_vec<T, n>& other);
T length() const;
T& operator[](std::size_t idx);
const T& operator[](std::size_t idx) const;
iterator begin();
const_iterator cbegin() const;
iterator end();
const_iterator cend() const;
private:
std::array<T, d> m_data;
};
template<typename T, std::size_t d>
basic_vec<T, d>::basic_vec() {
m_data.fill(static_cast<T>(0));
}
template<typename T, std::size_t d>
basic_vec<T, d>::basic_vec(std::initializer_list<T> l) {
assert(l.size() <= d);
m_data.fill(static_cast<T>(0));
std::copy(l.begin(), l.end(), m_data.begin());
}
template<typename T, std::size_t d>
template<std::size_t n>
basic_vec<T, d>::basic_vec(const basic_vec<T, n>& other) {
static_assert(d >= n);
m_data.fill(static_cast<T>(0));
for (std::size_t i = 0; i < n; i++) {
m_data[i] = other[i];
}
}
template<typename T, std::size_t d>
T basic_vec<T, d>::length() const {
T res = static_cast<T>(0);
for (const T& val : m_data) {
res += val * val;
}
return res;
}
template<typename T, std::size_t d>
T& basic_vec<T, d>::operator[](std::size_t idx) {
return m_data[idx];
}
template<typename T, std::size_t d>
const T& basic_vec<T, d>::operator[](std::size_t idx) const {
return m_data[idx];
}
template<typename T, std::size_t d>
typename basic_vec<T, d>::iterator basic_vec<T, d>::begin() {
return m_data.begin();
}
template<typename T, std::size_t d>
typename basic_vec<T, d>::const_iterator basic_vec<T, d>::cbegin() const {
return m_data.cbegin();
}
template<typename T, std::size_t d>
typename basic_vec<T, d>::iterator basic_vec<T, d>::end() {
return m_data.end();
}
template<typename T, std::size_t d>
typename basic_vec<T, d>::const_iterator basic_vec<T, d>::cend() const {
return m_data.cend();
}
template<typename T, std::size_t d>
basic_vec<T, d> operator+(const basic_vec<T, d>& rhs, const basic_vec<T, d>& lhs) {
basic_vec<T, d> out;
auto rit = rhs.cbegin(), lit = lhs.cbegin();
std::generate(out.begin(), out.end(), [rit, lit] () mutable {
return *(rit++) + *(lit++);
});
return out;
}
template<typename T, std::size_t d>
basic_vec<T, d> operator*(const T& rhs, const basic_vec<T, d>& lhs) {
basic_vec<T, d> out;
auto lit = lhs.cbegin();
std::generate(out.begin(), out.end(), [rhs, lit] () mutable {
return rhs * *(lit++);
});
return out;
}
template<typename T, std::size_t d>
basic_vec<T, d> operator-(const basic_vec<T, d>& rhs, const basic_vec<T, d>& lhs) {
return rhs + static_cast<T>(-1) * lhs;
}
template<typename T, std::size_t d>
T operator*(const basic_vec<T, d>& rhs, const basic_vec<T, d>& lhs) {
T res = static_cast<T>(0);
for (std::size_t i = 0; i < d; i++) {
res += rhs[i] * lhs[i];
}
return res;
}
template<typename T, std::size_t d>
std::ostream& operator<<(std::ostream& os, const basic_vec<T, d>& v) {
os << "<";
for (std::size_t i = 0; i < d -1; i++) {
os << v[i] << ", ";
}
os << v[d-1] << ">";
return os;
}
template<typename T, std::size_t d>
class vec: public basic_vec<T, d> {
public:
vec(std::initializer_list<T> l) : basic_vec<T, d>(l) {}
};
template<typename T>
class vec3 : public basic_vec<T, 3> {
public:
vec3(std::initializer_list<T> l) : basic_vec<T, 3>(l) {}
static vec3<T> cross(const vec3<T>& rhs, const vec3<T>& lhs);
};
template<typename T>
vec3<T> vec3<T>::cross(const vec3<T>& rhs, const vec3<T>& lhs) {
vec3<T> res;
// TODO: cross product
return res;
}
template<typename T>
class vec2: public basic_vec<T, 2> {
public:
vec2(std::initializer_list<T> l) : basic_vec<T, 2>(l) {}
T angle();
static vec3<T> cross(const vec2<T>& rhs, const vec2<T>& lhs);
};
template<typename T>
vec3<T> vec2<T>::cross(const vec2<T>& rhs, const vec2<T>& lhs) {
vec3<T> res;
// TODO: cross product
}
int main(int argc, char *argv[]) {
vec3<double> v{1, 2, 3};
vec3<double> u{3, 4, 5};
std::cout << v << std::endl;
std::cout << v.length() << std::endl;
std::cout << v + u << std::endl;
std::cout << v - u << std::endl;
std::cout << 2.0 * u << std::endl;
std::cout << v * u << std::endl;
return 0;
}
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