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  1.     #include <iostream>
  2.     #include <string>
  3.     using namespace std;
  4.  
  5.     class A{
  6.     };
  7.  
  8.     int main() {
  9.  
  10. 	    // string::string(charT const* s)
  11. 	    string s1("12345");
  12. 	    // 5 - because constructor takes into account null-terminated character
  13. 	    cout << s1.size() << endl;		
  14.  
  15. 	    // string(std::initializer_list<charT> ilist)
  16. 	    string s2({'1','2','3','4','5'});	
  17. 	    // 5 - because string is built from the contents of the initializer list init. 	
  18. 	    cout << s2.size()<<endl;
  19.  
  20.         // string::string(charT const* s, size_type count)
  21. 	    string s3("12345",3);
  22.         // 3 -  Constructs the string with the first count characters of character string pointed to by s
  23. 	    cout << s3.size() << endl;
  24.  
  25. 	    // basic_string( std::initializer_list<CharT> init,const Allocator& alloc = Allocator() ); - ?
  26. 	    string s4({'1','2','3','4','5'},3);
  27. 	    // 2 - why this compiles (with no warning) and what this result means?
  28. 	    cout << s4.size() << endl;
  29.  
  30.  
  31.  
  32. 	    string s5({'1','2','3','4','5'},5);
  33. 	    // 0 - why this compiles (with no warning) and what this result means?
  34. 	    cout << s5.size() << endl;
  35.  
  36. 	    // basic_string( std::initializer_list<CharT> init,const Allocator& alloc = Allocator() );
  37. 	    // doesn't compile, no known conversion for argument 2 from 'A' to 'const std::allocator<char>&'
  38. 	    //string s6({'1','2','3','4','5'},A());
  39. 	    //cout << s6.size() << endl;
  40.  
  41. 	    return 0;
  42.     }
Success #stdin #stdout 0s 3412KB
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https://ideone.com/5Agc2T
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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