Non-Type Template Argument Is Not A Constant Expression – #include #include #include enum atype { undefined = 0, typea,.</p>reviews: The function is constexpr and is. It correctly identfies that the parameter c in opt_doesnt_work isn't constexpr. Such arguments must be constant.

In my main function i have the following block of code. A non type template argument must be a constant expression which the return. Why does parameter b as struct passes while n as int fails? Such arguments must be constant.

Non-Type Template Argument Is Not A Constant Expression

Non-Type Template Argument Is Not A Constant Expression

If you declare a template function in your top level, and the template parameter is not static, it means that from one call to the other the function can change. It doesn't matter if a function is declared as constexpr and you feed it constexpr arguments. These are parameter to function takeb and takeint which is not template argument of a.

It’s not a problem of constexpr actually, is a problem of template argument deduction. In particular, the line with the comment gives me the following error.

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