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  1. #include <cassert>
  2. #include <iostream>
  3. #include <cmath>    // for std::abs
  4.  
  5. template<unsigned int DIM> class Test
  6. {
  7. private:
  8.     double abs_error = 1e-6;
  9.     double mData[DIM];
  10.  
  11. public:
  12.     double& operator[](int index)
  13.     {
  14.         // To check that the input index is a valid one
  15.         assert(index < DIM);
  16.         assert(index > -1);
  17.  
  18.         // Condition that checks for values between 0 and 1 inclusive
  19.         if (mData[index] >= 0.0 && mData[index] <= 1.0)
  20.         {
  21.             return mData[index];
  22.         }
  23.  
  24.         // Values less than zero
  25.         else if (std::abs(mData[index]) <= abs_error && mData[index] <= 0.0)
  26.         {
  27.             return mData[index] = 0;
  28.         }
  29.  
  30.         // Values more than one
  31.         else if (mData[index] >= 1.0 && std::abs(mData[index] - 1.0) <= abs_error)
  32.         {
  33.             std::cout << "You used this condition." << std::endl;
  34.             return mData[index] = 1;
  35.         }
  36.  
  37.         // For every other possible value
  38.         else
  39.         {
  40.             assert(0);
  41.             throw 42;
  42.         }
  43.  
  44.         return mData[index];
  45.  
  46.     }
  47.  
  48. };
  49.  
  50.  
  51. int main()
  52. {
  53.     Test<6> p;
  54.     p[0] = 0.5;
  55.     std::cout << "p[0]: " << p[0] << std::endl;
  56.     p[1] = -1e-7;
  57.     std::cout << "p[1]: " << p[1] << std::endl;
  58.     // Comment the following two lines and check the test statement
  59.     //p[2] = 1+1e-8;
  60.     //std::cout << "p[2]: " << p[2] << std::endl;
  61.  
  62.     // This code tests the same condition as in Test.h for 
  63.     // values more than one
  64.     bool foo = 1+1e-8 >= 1.0 && std::abs(1+1e-8 - 1.0) <= 1e-6;
  65.     std::cout << "foo (should return 1): " << foo << std::endl;
  66.  
  67.     return 0;
  68. }
Success #stdin #stdout 0s 3412KB
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Standard input is empty
stdout
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p[0]: 0.5
p[1]: 0
foo (should return 1): 1
https://ideone.com/X9e3S1
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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