关于C中赋值运算符的问题++

struct fraction
{
  size_t numerator;
  size_t denominator;

  operator float() const
  {
     return ((float)numerator)/denominator;
  }
};

struct fraction
{
  size_t numerator;
  size_t denominator;

  float as_float() const
  {
     return ((float)numerator)/denominator;
  }
};

as_float

struct fraction {
     //other members here...
     operator double() const { return (double)numerator / denominator;}
     //other members here...
};

您可以使用double运算符进行转换:

struct fraction
{
     operator double() const
      {
         //remember to check for  denominator to 0
          return (double)numerator/denominator;
      }
};

operator= struct 公众 operator double

operator double() {
  return ((double) numerator))/denominator;
}

operator double() 编译器将使用它进行此转换。