#define TO_STR__(...) #__VA_ARGS__
#define TO_STR_(...) TO_STR__(__VA_ARGS__)
#define TO_STR(...) TO_STR_(__VA_ARGS__)
 
#include <iostream>
int main()
{
    std::cout << "String from #include <string>, ";
    static const char* str = TO_STR(
#include <string>
    );
    
    std::cout << sizeof(str) / sizeof(char) << " characters:\n\n";
    std::cout << str << "\n";
}