Re: [boost] [metaparse] performance comparisons?

Subject: Re: [boost] [metaparse] performance comparisons?
From: Peter Dimov (lists_at_[hidden])
Date: 2015-06-02 06:31:17

Louis Dionne wrote:
> `constexpr` char arrays and character packs are not equivalent. The 
> problem is that constexpr-ness is stripped away by argument passing. For 
> illustration, consider the following example:
>
>     template <typename CompileTimeString>
>     void f(CompileTimeString s) {
>         static_assert(s == "abc", "");
>     }
>
>     constexpr std::string_literal<n> n4121 = "abc";
>     constexpr auto n4236 = "abc"_s;
>
>     f(n4121); // error: s is not constexpr within the body of f
>     f(n4236); // ok: the value of s is contained in its type

I assume that you mean for 'f' to be constexpr?