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  1. #include <iostream>
  2. #include <cstring>
  3. using namespace std;
  4.  
  5. struct string_view
  6. {
  7. 	string_view() = default;
  8. 	string_view(const string_view& other) = default;
  9.  
  10. 	string_view(const string& str)
  11. 		: ptr(str.c_str()), size(str.length())
  12. 	{}
  13.  
  14. 	string_view(const char* str)
  15. 		: ptr(str), size(::strlen(str))
  16. 	{}
  17.  
  18. 	string_view(const char* str, size_t len)
  19. 		: ptr(str), size(len)
  20. 	{}
  21.  
  22. 	// Protection for temporary objects
  23. 	string_view(string&& str) = delete;
  24.  
  25. 	string_view& operator=(const string_view&) = default; 
  26.  
  27. 	const char *ptr = nullptr;
  28. 	size_t      size = 0;
  29. };
  30.  
  31. string get_host()
  32. {
  33. 	return "http://h...content-available-to-author-only...d.su";
  34. }
  35.  
  36. string_view get_schema(string_view uri)
  37. {
  38. 	return uri;
  39. }
  40.  
  41. string_view get_schema2(string url)
  42. {
  43. 	string_view v(url);
  44. 	return v;
  45. }
  46.  
  47. const char* get_schema3(string url)
  48. {
  49. 	return url.c_str();
  50. }
  51.  
  52. int main() 
  53. {
  54. 	{
  55. 		// Compilation error:
  56. 		//auto v1 = get_schema(get_host());
  57.  
  58. 		//string_view v2;
  59. 		//v2 = get_host();
  60. 	}
  61.  
  62. 	{
  63. 		// WA for protection
  64. 		auto v1 = get_schema2(get_host());
  65. 		auto v2 = get_schema(get_host().c_str());
  66. 	}
  67.  
  68. 	{
  69. 		// Valid usage	
  70. 		string str = get_host();
  71. 		auto v1 = get_schema(str);
  72.  
  73. 		string_view v2 = "hello";
  74.  
  75. 		auto v3 = get_schema("http://h...content-available-to-author-only...d.su");
  76. 	}
  77.  
  78.  
  79.  
  80. 	return 0;
  81. }
  82.  
  83.  
Success #stdin #stdout 0s 3408KB
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https://ideone.com/LnO43G
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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