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  1. #include <functional>
  2. #include <iostream>
  3.  
  4. template<typename T>
  5. struct property
  6. {
  7. public:
  8.   typedef std::function<T()> getter;
  9.   typedef std::function<void(T)> setter;
  10.  
  11. public:
  12.   property(getter get, setter set)
  13.   : get_(get)
  14.   , set_(set)
  15.   { }
  16.  
  17.   operator T() const { return get_(); }
  18.   property& operator=(T x) { set_(x); return *this; }
  19.  
  20. private:
  21.   getter get_;
  22.   setter set_;
  23. };
  24.  
  25. class Vec2
  26. {
  27. public:
  28.   Vec2(int vx, int vy)
  29.   : x(std::bind(&Vec2::get_x, this), std::bind(&Vec2::set_x, this, std::placeholders::_1))
  30.   , y(std::bind(&Vec2::get_y, this), std::bind(&Vec2::set_y, this, std::placeholders::_1))
  31.   , x_(vx)
  32.   , y_(vy)
  33.   { }
  34.  
  35.   property<int> x;
  36.   property<int> y;
  37.  
  38. protected:
  39.   int get_x() { return x_; }
  40.   void set_x(int x) { x_ = x; }
  41.  
  42.   int get_y() { return y_; }
  43.   void set_y(int y) { y_ = y; }
  44.  
  45. private:
  46.   int x_, y_;
  47. };
  48.  
  49. class Vec3
  50. {
  51. public:
  52.   Vec3(int vx, int vy, int vz)
  53.   : x(std::bind(&Vec3::get_x, this), std::bind(&Vec3::set_x, this, std::placeholders::_1))
  54.   , y(std::bind(&Vec3::get_y, this), std::bind(&Vec3::set_y, this, std::placeholders::_1))
  55.   , z(std::bind(&Vec3::get_z, this), std::bind(&Vec3::set_z, this, std::placeholders::_1))
  56.   , xy(std::bind(&Vec3::get_xy, this), std::bind(&Vec3::set_xy, this, std::placeholders::_1))
  57.   , xz(std::bind(&Vec3::get_xz, this), std::bind(&Vec3::set_xz, this, std::placeholders::_1))
  58.   , yz(std::bind(&Vec3::get_yz, this), std::bind(&Vec3::set_yz, this, std::placeholders::_1))
  59.   , x_(vx)
  60.   , y_(vy)
  61.   , z_(vz)
  62.   { }
  63.  
  64.   property<int> x;
  65.   property<int> y;
  66.   property<int> z;
  67.  
  68.   property<Vec2> xy;
  69.   property<Vec2> xz;
  70.   property<Vec2> yz;
  71.  
  72. protected:
  73.   int get_x() { return x_; }
  74.   void set_x(int x) { x_ = x; }
  75.  
  76.   int get_y() { return y_; }
  77.   void set_y(int y) { y_ = y; }
  78.  
  79.   int get_z() { return z_; }
  80.   void set_z(int z) { z_ = z; }
  81.  
  82.   Vec2 get_xy() { return { x_, y_ }; }
  83.   void set_xy(Vec2 xy) { x_ = xy.x; y_ = xy.y; }
  84.  
  85.   Vec2 get_xz() { return { x_, z_ }; }
  86.   void set_xz(Vec2 xz) { x_ = xz.x; z_ = xz.y; }
  87.  
  88.   Vec2 get_yz() { return { y_, z_ }; }
  89.   void set_yz(Vec2 yz) { y_ = yz.x; z_ = yz.y; }
  90.  
  91. private:
  92.   int x_, y_, z_;
  93. };
  94.  
  95. std::ostream& operator<<(std::ostream& out, const Vec2& v2)
  96. {
  97.   out << '[' << v2.x << ", " << v2.y << ']';
  98.   return out;
  99. }
  100.  
  101. std::ostream& operator<<(std::ostream& out, const Vec3& v3)
  102. {
  103.   out << '[' << v3.x << ", " << v3.y << ", " << v3.z << ']';
  104.   return out;
  105. }
  106.  
  107. int main(int argc, char** argv)
  108. {
  109.   Vec3 v3 { 2, 0, 1 };
  110.   std::cout << v3 << std::endl;
  111.   v3.y = 3;
  112.   std::cout << v3.xy << std::endl;
  113.   std::cout << v3.xz << std::endl;
  114.   std::cout << v3.yz << std::endl;
  115.  
  116.   return 0;
  117. }
  118.  
Success #stdin #stdout 0s 3488KB
comments (?)
stdin
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Standard input is empty
stdout
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[2, 0, 1]
[2, 3]
[2, 1]
[3, 1]
https://ideone.com/2H1ezx
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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