operator overloading c++ for non-friend class

Question

I tried to implement the following function

std::string operator+(std::string s, int t);

but it doesn't get called if I try

std::string s = "abc" + 123;

although it gets called if I call

operator+("abc", 123);

Is there something I am missing?

Answer 1

"abc" is not a std::string , but a const char[] . You could try:

std::string s = std::string("abc") + 123;

Or, if you are using C++14,

using namespace std::string_literals;
std::string s = "abc"s + 123;