Can You Pass String Literals as Non-Type Template Arguments?

Passing String Literals as Non-Type Template Arguments

Problem Statement:

Can you define a class template with a non-type template parameter that accepts a string literal, such as my_class<"string">?

Solution:

While it's not possible to directly pass a string literal as a non-type template parameter, you can achieve a similar effect by declaring a const char* parameter and passing it a const char[] variable with static linkage.

Example Code:

#include <iostream>

template<const char *str>
struct cts {
    void p() {std::cout << str;}
};

static const char teststr[] = "Hello world!";
int main() {
    cts<teststr> o;
    o.p();
}

Explanation:

In this code, the template parameter str is a const char*, which can point to a string literal or a string variable. The variable teststr is declared as a static const char[] with the string literal "Hello world!". By passing teststr as the template argument, you can effectively access the string literal within the class template.

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