Can't add strings in C++

Question

#include 


int main()
{
    const std::string exclam = \"!\";
    const std::string message = \"Hello\" + \", world\" + exclam;
    std::cout <&l         


        

Answer 1

The problem is that basic string literals like "this is a literal" are not of type std::string so they do not concatenate with the + operator.

In post C++14 you can use standard user defined string literals that are of type std::string:

using namespace std::literals; // somewhere in the scope

auto message = "Hello"s + ", world"s; // message is type std::string

See std::literals::string_literals::operator""s.