Differentiate String Literal from Char Array

Question

I want to write some function that takes a string literal - and only a string literal:

template 
void foo(const char (&s         


        

Answer 1

Depending on what exactly you want, this may or may not work for you:

#include 

template 
void foo(const char (&str)[N]) {}

template  struct check_literal {};

#define foo(arg) foo((check_literal(),arg))    

int main()
{

    // This compiles
    foo("abc");

    // This does not
    static const char abc[] = "abc";
    foo(abc);
}

This works with g++ and clang++ in -std=c++11 mode only.