const char *s = R"(apple)"; 是什么意思？

Question

const char *s = R"(apple)";

R"()" 是什么语法？

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
using namespace std;

int main()
{
    const char* s = R"(apple)";
    printf("%s\n", s);

    system("pause");
    return 0;
}

Answer 1

用来避免转义字符
// Raw string literals containing unescaped \ and "
auto R0 = R"("Hello \ world")"; // const char*
auto R1 = u8R"("Hello \ world")"; // const char*, encoded as UTF-8
auto R2 = LR"("Hello \ world")"; // const wchar_t*
auto R3 = uR"("Hello \ world")"; // const char16_t*, encoded as UTF-16
auto R4 = UR"("Hello \ world")"; // const char32_t*, encoded as UTF-32