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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <cstring>
  4.  
  5. class String
  6. {
  7. 	int length_;
  8. 	char * data_;
  9.  
  10. public:
  11. 	String()
  12. 		: length_ { 0 }
  13. 		, data_ { nullptr }
  14. 	{
  15. 	}
  16.  
  17. 	String(char const * str, int len = 0)
  18. 		: length_ { static_cast<int>(len ? len : strlen(str)) }
  19. 		, data_ { new char[length_ + 1] }
  20. 	{
  21. 		strcpy(data_, str);
  22. 	}
  23.  
  24. 	String(String const & orig)
  25. 		: length_ { orig.length_ }
  26. 		, data_ { new char[length_ + 1] }
  27. 	{
  28. 		strcpy(data_, orig.data_);
  29. 	}
  30.  
  31. 	String & operator = (String const & orig)
  32. 	{
  33. 		String tmp { orig };
  34. 		swap(tmp);
  35. 		return *this;
  36. 	}
  37.  
  38. 	~String()
  39. 	{
  40. 		delete[] data_;
  41. 	}
  42.  
  43. 	void swap(String & other)
  44. 	{
  45. 		if (this == &other) return;
  46. 		std::swap(length_, other.length_);
  47. 		std::swap(data_, other.data_);
  48. 	}
  49.  
  50. 	String operator + (String const & rhs) const
  51. 	{
  52. 		String result;
  53. 		result.length_ = length_ + rhs.length_ + 1;
  54. 		result.data_ = new char[result.length_];
  55. 		strcpy(result.data_, data_);
  56. 		strcat(result.data_, rhs.data_);
  57. 		return result;
  58. 	}
  59.  
  60. 	char const * c_str() const
  61. 	{
  62. 		return data_;
  63. 	}
  64. };
  65.  
  66. int main()
  67. {
  68. 	String foo { "foo" };
  69. 	String bar { "bar" };
  70. 	std::cout << (foo + bar).c_str() << std::endl;
  71. 	return 0;
  72. }
  73.  
Success #stdin #stdout 0s 16064KB
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https://ideone.com/wXaO59
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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