title: C++ multiline string raw literal
body: <p>We can define a string with multiline like this:</p>
  
  <pre><code>const char* text1 = "part 1"
                      "part 2"
                      "part 3"
                      "part 4";
  
  const char* text2 = "part 1\
                       part 2\
                       part 3\
                       part 4";
  </code></pre>
  
  <p>How about with raw literal, I tried all, no one works</p>
  
  <pre><code>std::string text1 = R"part 1"+
                      R"part 2"+ 
                      R"part 3"+
                      R"part 4";
  
  std::string text2 = R"part 1"
                      R"part 2" 
                      R"part 3"
                      R"part 4";
  
  std::string text3 = R"part 1\
                        part 2\ 
                        part 3\
                        part 4";
  
  std::string text4 = R"part 1
                        part 2 
                        part 3
                        part 4";
  </code></pre>