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  1. #include <iostream>
  2. #include <fstream>
  3. #include <sys/time.h>
  4. #include <float.h>
  5.  
  6. using namespace std;
  7.  
  8. struct timeval start_time,end_time;
  9.  
  10. // We shall try results with different N values 
  11. static const int N=100;
  12. // We shall try results with different OFFSET values 
  13. static const int OFFSET=0;
  14.  
  15. //--------------------------------------------------------------------------------------------------------------------------------------------
  16. // template <typename Left, typename Right> 		     // Left and Right might be expressions! 					   
  17. // class sum { 				     // Functor to evaluate left[i]+right[i]
  18.  
  19. // private:
  20. 	// Left myleft;				     // operator[](int) is another standard operator					
  21. 	// Right myright;
  22. // public:
  23. 	// sum(Left l, Right r) : myleft(l), myright(r) {} 
  24.  
  25. 	// int operator[](int i) {return (myleft[i]+myright[i]);}	     // Left and right must also define operator[]
  26.  
  27.  
  28. // }; 		
  29.  
  30. //----------------------------------------------------- 
  31.  
  32. // template <typename T>							
  33.  
  34. 		// T arrayElementAdd(T a, T b) {		
  35.  
  36. 			// return a+b;	
  37. 		// }
  38.  
  39.  
  40. //----------------------------------------------------- 
  41. template<typename T> 
  42. class array {
  43.  
  44. private:
  45. 	T* data;
  46.  
  47. 	int N;
  48.  public:
  49. 	array( T *_data, int _N) : data(_data), N(_N) { } 	// Constructor
  50.  
  51. 	// // template <typename Left,typename Right>       	// Assign the result of sum<left,right>[i] to â??this arrayâ?
  52.  
  53.     // void operator=(T right) {		// Argument is a functor embodying  left+right					
  54. 			// data[i] = right[i];
  55.     // }
  56. 	void operator=(const T& right) {		// Argument is a functor embodying  left+right					
  57. 		for(int i=1; i<=N; i++)
  58. 			data[i] = right[i];
  59.     }
  60.  
  61. 	array operator+(const array& right) {
  62. 		array arr = *this;
  63.  
  64. 		// T *arrmem = new T(N);
  65. 		// array<T> arr(arrmem,N);
  66.  
  67. 		for(int i=1; i<=N; i++)
  68. 			arr[i]=arr[i]/*+right[i+OFFSET]*/;	
  69.  
  70. 		return arr;
  71. 	}
  72.  
  73. 	T& operator[](const int i) {return data[i];}
  74. }; 
  75.  
  76. //-------------------------------------------------------------
  77.  
  78.  
  79. int main()
  80. {
  81. 	int *amem = new int(N);
  82. 	int *bmem = new int(N);
  83. 	int *cmem = new int(N);
  84.  
  85. 	array<int> a(amem, N);
  86. 	array<int> b(bmem, N);
  87. 	array<int> c(cmem, N);
  88.  
  89.     //Initialization of vectors with values from 1 to 500
  90.     for (int i=1;i<=N;i++)
  91. 	{
  92. 		c[i]=i;
  93. 		b[i]=c[i];
  94. 		a[i]=b[i];
  95.     }
  96.  
  97. 	gettimeofday(&start_time,NULL);
  98. 	// Burada okuduÄ?umuz ilk deÄ?ere bakalım
  99. 	cout<<"\n\ngettimeofday start_time (in seconds)="<<
  100. 		start_time.tv_sec;
  101. 	cout<<"\n\ngettimeofday start_time (in micro secs)="<<
  102. 		start_time.tv_usec;
  103.  
  104. 	a=b+c;
  105.  
  106. 	for (int i=1;i<=N-OFFSET;i++)
  107.     {
  108. 		// // a[i]=b[i]+c[i+OFFSET];
  109. 		// a[i] = arrayElementAdd(b[i], c[i]);
  110. 		cout << "\n" << (int)a[i];
  111.     }
  112.  
  113. 	gettimeofday(&end_time,NULL);
  114. 	// Burada okuduÄ?umuz son deÄ?ere bakalım
  115. 	cout<<"\n\ngettimeofday end_time (in seconds)="<<
  116. 		end_time.tv_sec;
  117. 	cout<<"\n\ngettimeofday end_time (in micro secs)="<<
  118. 		end_time.tv_usec;
  119.  
  120.     //Print the resultant array.
  121.    cout<<"\n\ngettimeofday wall time="<<
  122. 	end_time.tv_sec - start_time.tv_sec+(end_time.tv_usec-start_time.tv_usec)/1e6;
  123.  
  124. }
Success #stdin #stdout 0s 3228KB
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gettimeofday start_time (in seconds)=1432213086

gettimeofday start_time (in micro secs)=368611
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gettimeofday end_time (in seconds)=1432213086

gettimeofday end_time (in micro secs)=368663

gettimeofday wall time=5.2e-05
https://ideone.com/cvmBrW
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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