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Re: [v3 PATCH] PR libstdc++/78420
- From: Tim Song <t dot canens dot cpp at gmail dot com>
- To: Ville Voutilainen <ville dot voutilainen at gmail dot com>
- Cc: "libstdc++" <libstdc++ at gcc dot gnu dot org>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Sun, 22 Jan 2017 10:57:51 -0500
- Subject: Re: [v3 PATCH] PR libstdc++/78420
- Authentication-results: sourceware.org; auth=none
- References: <CAFk2RUZkFK6Fsraek-01GtwxAjbZvPM3DOUPhAxUfHwiRXd8LQ@mail.gmail.com>
On Sun, Jan 22, 2017 at 10:42 AM, Ville Voutilainen
<ville.voutilainen@gmail.com> wrote:
> + _GLIBCXX14_CONSTEXPR
> + bool
> + operator()(_Tp* __x, _Tp* __y) const
> + { return uintptr_t(__x) > uintptr_t(__y); }
These reinterpret_casts can't possibly be constexpr.
Simple test case:
#include <functional>
constexpr bool g() {
int a[10] = {};
return std::greater<int*>{}(a, a+5);
}
static_assert(!g(), "");