NFD » ndn-cxx

This turns out to be unimplementable. The C++14 standard says (combination of §13.5.8/1 [over.literal] and §17.6.4.3.4 [usrlit.suffix]):

Literal suffix identifiers that do not start with an underscore are reserved for future standardization.
A declaration whose literal-operator-id uses such a literal suffix identifier is ill-formed; no diagnostic required.

So we cannot define an operator""s

We can define operator""_s though, which could be used as follows:

  throw SomeError("foo"_s + "bar");

which is still better than:

  throw SomeError(std::string("foo") + "bar");