How Can I Pass String Literals as Template Arguments in C ?

Passing a String as a Template Argument

In C , when defining a class template, non-type parameters can also be specified. A common use case involves passing string literals as such parameters. Here's how this can be achieved:

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

#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();
}

Here, the Cts template has a non-type parameter str of type const char*. We define a static variable testStr of type const char[] and pass it as the argument to Cts.

This approach effectively mimics the behavior of passing string literals as template arguments and allows you to create class templates that operate on specific string values.

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