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Topic: String literal length as template parameter (Read 55 times) previous topic - next topic

xdddman

I want to do something like this:

Code: [Select]

template<size_t n>
struct arrayReturn {
int arr[n];
};

auto createArray(const char* input) -> arrayReturn<strlen(input) + 1> {
arrayReturn<strlen(input) + 1> temp;
       
         // copy char* to arr

        return temp;
}



or at least something like that, to create a sized int array from a string literal. However, this program is failing to compile because it says strlen(input) +1 cannot be evaluated at compile time. Is there a way I can compute the string literals size at compile time?

arduino_new

There is no way. Template argument must be resolved at compile time so the compiler can generate the correct function/class.
Remember that template is not code; it is a recipe so the compiler can cook code from.

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