I wrote an operator function that returns std::stringstream when suffix _f appears.
#include <iostream>
#include <sstream>
#include <utility>
static std::stringstream&& operator "" _f(const char* const s, const size_t _) {
return std::move(std::stringstream() << s);
}
int main() {
const auto s = "Number: "_f << 10 << '\n';
std::cout << s.str();
return 0;
}
However, when I run this I get a runtime exception: "Access violation reading location ...".
Can you please tell me, where's the mistake in my code?
The operator returns a reference to a temporary std::stringstream object inside the function, resulting in a dangling reference. You should return std::stringstream directly.
static std::stringstream operator "" _f(const char* const s, const size_t _) {
return std::stringstream() << s;
}