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  1. #include <algorithm>
  2. #include <cstddef>
  3. #include <iostream>
  4. #include <iterator>
  5. #include <string>
  6.  
  7. class string_literal
  8. {
  9.     char const* begin_;
  10.     char const* end_;
  11.     static constexpr std::size_t str_len(char const* begin, std::size_t len) {
  12.         return *begin == 0? len: str_len(begin + 1, len + 1);
  13.     }
  14. public:
  15.     constexpr string_literal(char const* b)
  16.         : begin_(b), end_(b + str_len(b, 0)) {
  17.     }
  18.     constexpr string_literal(char const* b, char const* e)
  19.         : begin_(b), end_(e) {
  20.     }
  21.     constexpr char const* begin() const { return this->begin_; }
  22.     constexpr char const* end() const   { return this->end_; }
  23.     bool operator== (std::string const& other) const {
  24.         return other.size() == std::size_t(std::distance(begin_, end_))
  25.             && std::equal(begin_, end_, other.begin());
  26.     }
  27.     bool operator!= (std::string const& other) const {
  28.         return !(*this == other);
  29.     }
  30. };
  31.  
  32. std::ostream& operator<< (std::ostream& out, string_literal const& s) {
  33.     std::ostream::sentry cerberos(out);
  34.     if (cerberos) {
  35.         out << '\'';
  36.         std::copy(s.begin(), s.end(), std::ostreambuf_iterator<char>(out));
  37.         out << '\'';
  38.     }
  39.     return out;
  40. }
  41.  
  42. constexpr string_literal operator"" _sl(char const* begin, std::size_t)
  43. {
  44.     return string_literal(begin);
  45. }
  46.  
  47. constexpr string_literal hello_1("hello"_sl);
  48. constexpr string_literal hello_2("hello");
  49.  
  50. int main()
  51. {
  52.     std::cout << "hello\0world"_sl << '\n'; 
  53.     std::cout << hello_1 << '\n'; 
  54. }
  55.  
Success #stdin #stdout 0s 3340KB
comments (?)
stdin
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Standard input is empty
stdout
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'hello'
'hello'
https://ideone.com/Vs1VCh
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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