在这个参考链接中:https://en.cppreference.com/w/cpp/language/string_literal,原始字符串被定义为:
prefix(optional) R"d-char-sequence(optional)(r-char-sequence(optional))d-char-sequence(optional)"
示例:
const char* s1 = R"foo(
Hello
World
)foo";
(在上面的示例中为“foo”)的目的是什么?