fork(9) download
copy 
  1. #include <iostream>
  2. #include <chrono>
  3. using namespace std;
  4.  
  5. typedef std::chrono::high_resolution_clock Clock;
  6.  
  7.  
  8. class Dimension
  9. {
  10. public:
  11. 	Dimension(int _X, int _Y)
  12. 	{
  13. 		mX = _X;
  14. 		mY = _Y;
  15. 	}
  16.  
  17. private:
  18. 	int mX;
  19. 	int mY;
  20. };
  21.  
  22. template <class T>
  23. class Image
  24. {
  25. public:
  26. 	void Draw()
  27. 	{
  28. 		// Dispatch call to exact type
  29. 		static_cast<T*>(this)->Draw();
  30. 	}
  31.  
  32. 	Dimension GetDimensionInPixels()
  33. 	{
  34. 		// Dispatch call to exact type
  35. 		static_cast<T*>(this)->GetDimensionInPixels();
  36. 	}
  37.  
  38. protected:
  39. 	int dimensionX;
  40. 	int dimensionY;
  41. };
  42.  
  43. class PngImage : public Image<PngImage>
  44. {
  45. public:
  46. 	void Draw()
  47. 	{
  48. 	}
  49.  
  50. 	Dimension GetDimensionInPixels()
  51. 	{
  52. 		return Dimension(dimensionX, dimensionY);
  53. 	}
  54. };
  55.  
  56. class BitmapImage : public Image<BitmapImage>
  57. {
  58. public:
  59. 	void Draw()
  60. 	{
  61. 	}
  62.  
  63. 	Dimension GetDimensionInPixels()
  64. 	{
  65. 		return Dimension(dimensionX, dimensionY);
  66. 	}
  67. };
  68.  
  69. class TiffImage : public Image<TiffImage>
  70. {
  71. public:
  72. 	void Draw()
  73. 	{
  74. 		// Uncomment this to check method dispatch
  75. 		// cout << "TiffImage::Draw() called" << endl;
  76. 	}
  77.  
  78. 	Dimension GetDimensionInPixels()
  79. 	{
  80. 		return Dimension(dimensionX, dimensionY);
  81. 	}
  82. };
  83.  
  84. int main() {
  85.  
  86. 	Image<TiffImage>* pImage = new TiffImage;
  87.  
  88. 	auto then = Clock::now();
  89.  
  90. 	// Call Draw 1000 times to make sure perf is visible
  91. 	for (int i = 0; i < 1000; ++i)
  92. 		pImage->Draw();
  93.  
  94. 	auto now = Clock::now();
  95.  
  96. 	cout << "Time taken: " 
  97.               << std::chrono::duration_cast<std::chrono::nanoseconds>(now - then).count()
  98.               << " nanoseconds" << std::endl;
  99.  
  100. 	return 0;
  101. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
Time taken: 732 nanoseconds
https://ideone.com/IPD5Va
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!