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  1. #include <iostream>
  2. #include <string>
  3.  
  4. #define TEXTIFY(s)		(s)
  5.  
  6. int main()
  7. {
  8. 	std::string text1 = R"(begin
  9. a,
  10. b,
  11. c
  12. end)";
  13. 	std::cout << "text1[BGN]" << std::endl;
  14. 	std::cout << text1 << std::endl;
  15. 	std::cout << "text1[END]" << std::endl;
  16.  
  17.     // 通常の文字列リテラルで同じ内容を表現
  18. 	std::string text2 = "begin\na,\nb,\nc\nend";
  19. 	std::cout << std::boolalpha << "equality 1 2: " << (text1 == text2) << std::endl;
  20.  
  21. 	// プリプロセッサを通す場合(1)
  22. 	std::string text3 = TEXTIFY(text1);
  23. 	std::cout << std::boolalpha << "equality 2 3: " << (text2 == text3) << std::endl;
  24.  
  25. 	// プリプロセッサを通す場合(2)
  26. 	std::string text4 = TEXTIFY(R"(begin
  27. a,
  28. b,
  29. c
  30. end)");
  31. 	std::cout << std::boolalpha << "equality 2 4: " << (text2 == text4) << std::endl;
  32.  
  33. 	// プリプロセッサを通す場合(3)
  34. 	// マクロ定義が複数行に渡る場合、本来は \ で行継続せねばならないが、RAW stringの行継続は特別視 
  35. #define TEXT_DEFINITION     R"(begin
  36. a,
  37. b,
  38. c
  39. end)"
  40. 	std::string text5 = TEXT_DEFINITION;
  41. 	std::cout << text5 << std::endl;
  42. 	std::cout << std::boolalpha << "equality 2 5: " << (text2 == text5) << std::endl;
  43. }
  44.  
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
Standard input is empty
stdout 
text1[BGN]
begin
a,
b,
c
end
text1[END]
equality 1 2: true
equality 2 3: true
equality 2 4: true
begin
a,
b,
c
end
equality 2 5: true
https://ideone.com/AJcmZT
language:
C++14 (clang 8.0)
created:
3 days ago
visibility:
secret

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