string-constant-initialization.cpp

#include <cstdlib>

class const_str {
    const char* str;
    size_t len;

public:
    template<size_t N> constexpr const_str(const char (&str)[N]) : str{str}, len{N - 1} {}
    constexpr size_t size() const { return len; }
};

constexpr const_str g_c_str = "abc";

template<size_t N> struct int_to_type {};

int main() {
    int_to_type<g_c_str.size()>{};
}