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  1. #include <iostream>
  2.  
  3. template<typename C, typename T>
  4. struct caster;
  5.  
  6. template<typename C>
  7. struct caster<C, long>
  8. {
  9.   static long cast(const C& c) { return c.as_long(); }
  10. };
  11.  
  12. template<typename C>
  13. struct caster<C, double>
  14. {
  15.   static double cast(const C& c) { return c.as_double(); }
  16. };
  17.  
  18. template<typename C, typename T>
  19. struct ops_base
  20. {
  21.   friend bool operator==(const ops_base& l, const ops_base& r)
  22.   {
  23.     const C& cl = static_cast<const C&>(l);
  24.     const C& cr = static_cast<const C&>(r);
  25.     return (caster<C, T>::cast(cl) == caster<C, T>::cast(cr));
  26.   }
  27.  
  28.   friend bool operator==(const ops_base& l, T r)
  29.   {
  30.     const C& cl = static_cast<const C&>(l);
  31.     return (caster<C, T>::cast(cl) == r);
  32.   }
  33.  
  34.   friend bool operator==(T l, const ops_base& r)
  35.   {
  36.     const C& cr = static_cast<const C&>(r);
  37.     return (l == caster<C, T>::cast(cr));
  38.   }
  39.  
  40.   friend bool operator!=(const ops_base& l, const ops_base& r)
  41.   { return !(l == r); }
  42.  
  43.   friend bool operator!=(const ops_base& l, T r)
  44.   { return !(l == r); }
  45.  
  46.   friend bool operator!=(T l, const ops_base& r)
  47.   { return !(l == r); }
  48.  
  49.   friend bool operator<(const ops_base& l, const ops_base& r)
  50.   {
  51.     const C& cl = static_cast<const C&>(l);
  52.     const C& cr = static_cast<const C&>(r);
  53.     return (caster<C, T>::cast(cl) < caster<C, T>::cast(cr));
  54.   }
  55.  
  56.   friend bool operator<(const ops_base& l, T r)
  57.   {
  58.     const C& cl = static_cast<const C&>(l);
  59.     return (caster<C, T>::cast(cl) < r);
  60.   }
  61.  
  62.   friend bool operator<(T l, const ops_base& r)
  63.   {
  64.     const C& cr = static_cast<const C&>(r);
  65.     return (l < caster<C, T>::cast(cr));
  66.   }
  67.  
  68.   friend bool operator>(const ops_base& l, const ops_base& r)
  69.   {
  70.     const C& cl = static_cast<const C&>(l);
  71.     const C& cr = static_cast<const C&>(r);
  72.     return (caster<C, T>::cast(cl) > caster<C, T>::cast(cr));
  73.   }
  74.  
  75.   friend bool operator>(const ops_base& l, T r)
  76.   {
  77.     const C& cl = static_cast<const C&>(l);
  78.     return (caster<C, T>::cast(cl) > r);
  79.   }
  80.  
  81.   friend bool operator>(T l, const ops_base& r)
  82.   {
  83.     const C& cr = static_cast<const C&>(r);
  84.     return (l > caster<C, T>::cast(cr));
  85.   }
  86.  
  87.   friend bool operator<=(const ops_base& l, const ops_base& r)
  88.   { return !(l > r); }
  89.  
  90.   friend bool operator<=(const ops_base& l, T r)
  91.   { return !(l > r); }
  92.  
  93.   friend bool operator<=(T l, const ops_base& r)
  94.   { return !(l > r); }
  95.  
  96.   friend bool operator>=(const ops_base& l, const ops_base& r)
  97.   { return !(l < r); }
  98.  
  99.   friend bool operator>=(const ops_base& l, T r)
  100.   { return !(l < r); }
  101.  
  102.   friend bool operator>=(T l, const ops_base& r)
  103.   { return !(l < r); }
  104. };
  105.  
  106. template<typename C, typename T>
  107. struct io_base
  108. {
  109.   friend std::ostream& operator<<(std::ostream& out, const io_base& self)
  110.   {
  111.     const C& c = static_cast<const C&>(self);
  112.     return out << caster<C, T>::cast(c);
  113.   }
  114. };
  115.  
  116. struct Long : ops_base<Long, long>, io_base<Long, long>
  117. {
  118.   Long(long val) : value_(val) { }
  119.  
  120.   long as_long() const { return value_; }
  121.  
  122. private:
  123.   long value_;
  124. };
  125.  
  126. struct Float : ops_base<Float, double>, io_base<Float, double>
  127. {
  128.   Float(double val) : value_(val) { }
  129.  
  130.   double as_double() const { return value_; }
  131.  
  132. private:
  133.   double value_;
  134. };
  135.  
  136. int main(int argc, char** argv)
  137. {
  138.   {
  139.     Long l { 5 };
  140.     Long r { 6 };
  141.  
  142.     std::cout << "[Long, Long]" << std::endl;
  143.     std::cout << l << " == " << r << " : " << (l == r) << std::endl;
  144.     std::cout << l << " != " << r << " : " << (l != r) << std::endl;
  145.     std::cout << l << " < " << r << " : " << (l < r) << std::endl;
  146.     std::cout << l << " > " << r << " : " << (l > r) << std::endl;
  147.     std::cout << l << " <= " << r << " : " << (l <= r) << std::endl;
  148.     std::cout << l << " >= " << r << " : " << (l >= r) << std::endl;
  149.   }
  150.   {
  151.     Long l { 5 };
  152.     long r { 6 };
  153.  
  154.     std::cout << "[Long, long]" << std::endl;
  155.     std::cout << l << " == " << r << " : " << (l == r) << std::endl;
  156.     std::cout << l << " != " << r << " : " << (l != r) << std::endl;
  157.     std::cout << l << " < " << r << " : " << (l < r) << std::endl;
  158.     std::cout << l << " > " << r << " : " << (l > r) << std::endl;
  159.     std::cout << l << " <= " << r << " : " << (l <= r) << std::endl;
  160.     std::cout << l << " >= " << r << " : " << (l >= r) << std::endl;
  161.   }
  162.  
  163.   {
  164.     Float l { 5 };
  165.     Float r { 6 };
  166.  
  167.     std::cout << "[Float, Float]" << std::endl;
  168.     std::cout << l << " == " << r << " : " << (l == r) << std::endl;
  169.     std::cout << l << " != " << r << " : " << (l != r) << std::endl;
  170.     std::cout << l << " < " << r << " : " << (l < r) << std::endl;
  171.     std::cout << l << " > " << r << " : " << (l > r) << std::endl;
  172.     std::cout << l << " <= " << r << " : " << (l <= r) << std::endl;
  173.     std::cout << l << " >= " << r << " : " << (l >= r) << std::endl;
  174.   }
  175.   {
  176.     Float l { 5 };
  177.     float r { 6 };
  178.  
  179.     std::cout << "[Float, float]" << std::endl;
  180.     std::cout << l << " == " << r << " : " << (l == r) << std::endl;
  181.     std::cout << l << " != " << r << " : " << (l != r) << std::endl;
  182.     std::cout << l << " < " << r << " : " << (l < r) << std::endl;
  183.     std::cout << l << " > " << r << " : " << (l > r) << std::endl;
  184.     std::cout << l << " <= " << r << " : " << (l <= r) << std::endl;
  185.     std::cout << l << " >= " << r << " : " << (l >= r) << std::endl;
  186.   }
  187. }
  188.  
Success #stdin #stdout 0s 3300KB
comments (?)
stdin 
Standard input is empty
stdout 
[Long, Long]
5 == 6 : 0
5 != 6 : 1
5 < 6 : 1
5 > 6 : 0
5 <= 6 : 1
5 >= 6 : 0
[Long, long]
5 == 6 : 0
5 != 6 : 1
5 < 6 : 1
5 > 6 : 0
5 <= 6 : 1
5 >= 6 : 0
[Float, Float]
5 == 6 : 0
5 != 6 : 1
5 < 6 : 1
5 > 6 : 0
5 <= 6 : 1
5 >= 6 : 0
[Float, float]
5 == 6 : 0
5 != 6 : 1
5 < 6 : 1
5 > 6 : 0
5 <= 6 : 1
5 >= 6 : 0
https://ideone.com/BaCDvG
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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