c++ - Best way to make both a compile-time and runtime version of a function

Question

I have a function that will be called by both compile-time and runtime functions (gtest and python ctypes). I need a templated version and one with the templated variables as function parameters. For example

template<int A, int B, int C>
void function_compiletime(int a, int b, int c) {
    // code section 1
}

void function_runtime(int a, int b, int c, int A, int B, int C) {
    // code section 2
}

Where // code section 1 is identical to // code section 2. I am cautious that I might accidentally alter something in // code section 1 and not in // code section 2. How can enforce that the body of the functions should be identical?

question from:https://stackoverflow.com/questions/66065977/best-way-to-make-both-a-compile-time-and-runtime-version-of-a-function

Answer 1

Best way to make both a compile-time and runtime version of a function

How can enforce that the body of the functions should be identical?

By defining a single constexpr function:

constexpr void
function_runtime(int a, int b, int c, int A, int B, int C)
{
    // code section
}